datavorous/entrance-exam-dataset huggingface dataset:
Sickle-cell anaemia is caused by a substitution mutation. At the sixth position of haemoglobin, _____ due to this mutation

Options:
A basic amino acid is replaced by acidic amino acid
B acidic amino acid is replaced by basic amino acid
C acidic amino acid is replaced by acidic amino acid
D acidic amino acid is replaced by neutral amino acid

The correct answer is:
acidic amino acid is replaced by neutral amino acid

Solution:
Sickle cell anemia is an autosomal linked recessive trait disorder. It is controlled by a single allele - Hbs. The defect arises as the amino acid valine (neutral amino acid) replaces the normal chain amino acid glutamic acid (acidic amino acid) at the 6th position of the hemoglobin's beta chain. This change takes place due to the single base substitution of the sixth codon for beta-globin gene.

Topic: Biology, Principles of Inheritance and Variation, NEET
Sickle-cell anemia trait is an adaptation against malaria. It is due to substitution (point mutation) in which

Options:
A instead of an acidic amino acid valine, a neutral amino acid valine comes at the number 6th position in one of the Î²-chain of Hb
B instead of neutral amino acid valine, acidic amino acid glutamic acid is inserted at the number 6th position of Î² chain Hb
C instead of neutral amino acid glutamic acid, an acidic amino acid valine comes at 6th position in one of the Î²-chain of Hb
D instead of an acidic amino acid glutamic acid, a neutral amino acid valine comes at 6th position in one of the Î²-chain of Hb

The correct answer is:
instead of an acidic amino acid glutamic acid, a neutral amino acid valine comes at 6th position in one of the Î²-chain of Hb

Solution:
Sickle-cell anemia is a qualitative blood disorder, which is controlled by the recessive autosomal gene. In this change in single nucleotide in DNA sequence results in change in 6th amino acid of Î²-chain of Hb.

Topic: Biology, Principles of Inheritance and Variation, NEET
SiCl4 on hydrolysis forms 'X' and HCl. Compound 'X' loses water at 1000oC and gives 'Y'. Compounds 'X' and 'Y' respectively are

Options:
A H2SiCl6, SiO2
B H4SiO4, Si
C SiO2, Si
D H4SiO4, SiO2

The correct answer is:
H4SiO4, SiO2

Solution:
SiCl 4 +4 H 2 O→ H 4 SiO 4 ( X ) +4HCl
H 4 SiO 4 → 1000 o C Δ SiO 2 ( Y ) +2 H 2 O

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Signals for parturition originate from

Options:
A both placenta as well as fully developed foetus
B oxytocin released from maternal pituitary
C placenta only
D fully developed foetus only

The correct answer is:
both placenta as well as fully developed foetus

Solution:
The signals for parturition originates from a fully developed foetus and placenta which induce mild uterine contraction. This triggers the release of oxytocin (birth hormone) from the maternal pituitary gland.

Topic: Biology, Human Reproduction, NEET, NEET 2012 (Screening)
Significance of mimicry is:

Options:
A attack (offence)
B protection (defence)
C both (A) and (B)
D isolation

The correct answer is:
both (A) and (B)

Solution:
Mimicry refers to an evolved resemblance between an organism and another object, often an organism of another species. This resemblance provides protection from predation by other the organisms or predates its prey. Mimicry has two aspects concealment and warning.
Related Theory:-
Mimicry is when one species "mimics" another species in terms of sound, appearance, smell, behaviour, or location to protect itself. Camouflage is when a species changes to resemble its surroundings to protect itself.

Topic: Biology, Organisms and Populations, NEET, NEET 2002
Significance of the ‘heat shock’ method in bacterial transformation is to facilitate:

Options:
A Binding of DNA to the cell wall
B Uptake of DNA through membrane transport proteins
C Uptake of DNA through transient pores in the bacterial cell wall
D Expression of antibiotic resistance gene

The correct answer is:
Uptake of DNA through transient pores in the bacterial cell wall

Solution:
Heat shock enables the bacteria to take up the recombinant DNA.

Topic: Biology, Biotechnology - Principles and Processes, NEET
Silencing a specific mRNA in order to prevent its translation is known to be a cell defense mechanism. What is the name of this process useful in making transgenic organisms?

Options:
A Gene gun technology
B Elution
C RNA interference
D Gene deletion

The correct answer is:
RNA interference

Solution:
RNA interference (RNAi) is a process where a particular mRNA is not allowed to undergo translation by binding it with a complementary segment of mRNA. As a result, a dsRNA is formed which makes the original mRNA useless for making protein. This has been observed to be a cellular defense mechanism and utilized in developing a transgenic Tobacco plant that is resistant to the pest.

Topic: Biology, Biotechnology and Its Applications, NEET
Silencing of a gene could be achieved through the use of:

Options:
A RNAi only
B antisense RNA only
C both RNAi and antisense RNA
D none of the above

The correct answer is:
both RNAi and antisense RNA

Solution:
Silencing of a gene could be achieved through the use of both RNAi and antisense RNA.

Topic: Biology, Biotechnology and Its Applications, NEET
Silencing of a gene could be achieved through the use of

Options:
A RNAi only
B Antisense RNA only
C Both RNAi and antisense RNA
D Single stranded DNA only

The correct answer is:
Both RNAi and antisense RNA

Solution:
RNA interference (RNAi) is a biological process in which RNA molecules inhibit gene expression or translation, by neutralizing targeted mRNA molecules. Historically, RNAi was known by other names, including co-suppression, post-transcriptional gene silencing (PTGS). It is also known as anti-sense RNA technology. Antisense RNAs are unique DNA transcripts. They are small, noncoding, and diffusible molecules, containing 19-23 nucleotides that complement mRNA. With the development of antisense RNAs, their application will gradually replace traditional technology for gene-specific silencing.

Topic: Biology, Biotechnology and Its Applications, NEET
Silencing of mRNA has been used in producing transgenic plants resistant to

Options:
A bollworms
B nematodes
C white rusts
D bacterial blights

The correct answer is:
nematodes

Solution:
A nematode Meloidogyne incognita infests the roots of tobacco plants and causes a great reduction in yield. A novel strategy was adopted to prevent this infection that was based on the process of RNA interference (RNAi). RNA interference (RNAi) is the phenomenon of inhibiting the activity of a gene by the synthesis of RNA molecules complementary to the mRNA. the presence of antisense RNA will block the translation of the mRNA of the affected gene.

Topic: Biology, Biotechnology and Its Applications, NEET
Silver atom has completely filled d orbital (4d10) in its ground state. How can you say that it is a transition element?

Options:
A because Silver is known for its high melting and boiling points.
B because in the (+2) oxidation state, Silver has an incompletely filled d-orbital(d9)
C because Silver is paramagnetic in nature.
D because Silver forms colourful compounds due to d-d electronic transitions.

The correct answer is:
because in the (+2) oxidation state, Silver has an incompletely filled d-orbital(d9)

Solution:
Correct Option is : (B)
because in the (+2) oxidation state, Silver has an incompletely filled d-orbital(d9)

Topic: Chemistry, d and f Block Elements, NEET
Silver chloride dissolves in excess of ammonium hydroxide solution. The cation present in the resulting solution is

Options:
A [Ag(NH3)6]+
B [Ag(NH3)4]+
C Ag+
D [Ag(NH3)2]+

The correct answer is:
[Ag(NH3)2]+

Solution:
AgCl+2NH4OH→[Ag(NH3)2]+Cl-

Topic: Chemistry, Coordination Compounds, NEET
Silver cyanide →ΔSilver+A→OH-X+Y+H2O
In the above sequence of reaction A, X, Y are respectively.

Options:
A C N ¯ , (CN) 2 ,HCN
B (CN) 2 ,C N ¯ ,OC N ¯
C (CN)2,N2,OCN
D (CN)2,C22-,NO2-

The correct answer is:
(CN) 2 ,C N ¯ ,OC N ¯

Solution:
Here A, X and Y are CN 2 ,C N Â¯ ,OC N Â¯ respectively and the reaction is as follows
2AgCN â Î 2Ag+ (CN) 2
(CN) 2 +2O H ¯ →CN+ O ¯ CN+ H ¯ 2 O

Topic: Chemistry, d and f Block Elements, NEET
Silver forms ccp lattice and X-ray studies of its crystals show that the edge length of its unit cell is 408.6 pm. Calculate the density of silver (Atomic mass = 107.9 u).

Options:
A 7.2 grams
B 10.5 grams
C 14.8 grams
D 21.2 grams

The correct answer is:
10.5 grams

Solution:
Correct Option is : (B)
10.5 grams

Topic: Chemistry, Solid State, NEET
Silver iodide is used for producing artificial rains because AgI

Options:
A is easy to spray at high altitude
B is insoluble in water
C is easy to synthesize
D has crystals similar to ice

The correct answer is:
is easy to spray at high altitude

Solution:
Silver iodide is used for producing artificial rains because AgI is easy to spray at high altitude.

Topic: Chemistry, d and f Block Elements, NEET
Similar to electron diffraction, neutron diffraction microscope is also used for the determination of the structure of molecules. If the wavelength used here is 800 pm, calculate the characteristic velocity associated with the neutron.

Options:
A 494.5 ms–1
B 553.1 ms–1
C 698.0 ms–1
D 336.1 ms–1

The correct answer is:
494.5 ms–1

Solution:
Correct Option is : (A)
494.5 ms–1

Topic: Chemistry, Structure of Atom, NEET
Simple epithelium is a tissue in which the cells are

Options:
A hardened and provide support to the organs.
B cemented directly to one another to form a single layer.
C continuously dividing to provide form to an organ.
D loosely connected to one other to form an irregular organ.

The correct answer is:
cemented directly to one another to form a single layer.

Solution:
Simple epithelium is a tissue made of a single layer of compactly arranged cells all of which rest over a noncellular basement membrane.

Topic: Biology, Structural Organisation in Animals, NEET
Single cell protein can be useful in all, except

Options:
A Reducing environmental pollution
B Decreasing pressure on agriculture
C Preventing shift from meat to grain as diet by human beings
D Being acceptable as food in future

The correct answer is:
Preventing shift from meat to grain as diet by human beings

Solution:
Shift from meat to grain as food by man cannot be prevented as a human is addicted to the taste of meat.

Topic: Biology, Microbes in Human Welfare, NEET
Single cell protein can be useful in all, except

Options:
A Reducing environmental pollution
B Decreasing pressure on agriculture
C Preventing shift from meat to grain as diet by human beings
D Being acceptable as food in future

The correct answer is:
Preventing shift from meat to grain as diet by human beings

Solution:
Single-cell protein (SCP) or Probiotics is protein-rich microbial biomass that can be used as food and feed, e.g., Spirulina, mushrooms, Methylophilus methylotrophus. SCP has all the essential amino acids and low content of fats. Shift from meat to grain as food by man cannot be prevented as a human is addicted to the taste of meat.

Topic: Biology, Microbes in Human Welfare, NEET
Single step large mutation is named as _______X______ by ________Y______.

Find out the correct option for X and Y.

Options:
A

X	Y
Speciation	Hugo deVries

B

X	Y
Saltation	Charles Darwin

C

X	Y
Mutation	Charles Darwin

D

X	Y
Saltation	Hugo deVries

The correct answer is:

X	Y
Saltation	Hugo deVries

Solution:
Evolution for Darwin was gradual and for this variations must be accumulate to bring change while Hugo de Vries believed even a single mutation can cause speciation, and called it saltation for single step large mutation.

Topic: Biology, Evolution, NEET
Single-celled eukaryotes are included in

Options:
A Protista
B Fungi
C Archaea
D Monera

The correct answer is:
Protista

Solution:
Kingdom-Protista includes all unicellular eukaryotic organisms like flagellates, diatoms, dinoflagellate, slime mould, sarcodina, etc. Fungi represents a group of eukaryotic, achlorophyllous, non-photosynthetic heterotrophic organisms of diverse forms, sizes, physiology and mode of reproduction. The members of Archaea (Archaebacteria) are prokaryotes and include the extreme halophiles, the thermoacidophiles and the methanogens.
Monera is the kingdom, that in older classifications contains all prokaryotes.

Topic: Biology, Biological Classification, NEET, NEET 2010 (Screening)
Sino-atrial nodes are called the ____ of the heart.

Options:
A pacesetter
B Pacemaker
C brain
D heart

The correct answer is:
Pacemaker

Solution:
Sino-atrial nodes are called the pacemaker of the heart

Topic: Biology, Body Fluids and Circulation, NEET
Siphonogamous fertilization takes place in

Options:
A Bryophytes
B Selaginella
C Fern
D Pinus

The correct answer is:
Pinus

Solution:
Siphonogamous fertilization : The fertilization in which a long pollen tube carry two male sperms near to egg cell is called as siphonogamous fertilization. This is only found in gymnosperms and angiosperms.

Topic: Biology, Plant Kingdom, NEET
Siphonogamy is characteristics of:

Options:
A All spermatophytes
B Only gymnosperms
C Only angiosperms
D Only pteridophytes

The correct answer is:
All spermatophytes

Solution:
Siphonogamy is the phenomenon where the pollen grain develops a pollen-tube for transport of male gamete to the female gamete. Angiosperms are the flowering plants of the plant kingdom and most diverse group of plant kingdom. Gymnosperms are the non-flowering seed bearing plant group in the plant kingdom.
The seed plants are siphonogamous whereas in the lower plants the male cell swim to the egg cell, hence all spermatocytes are considered siphonogamous.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
Sir William Bowman was an English surgeon. He discovered Bowman's capsule, Bowman's glands and Bowman's membrane. Bowman's capsule is found in the kidney. Where do we find Bowman's glands and Bowman's membrane?

Options:
A Bowman's glands in eye and Bowman's membrane in nose
B Bowman's glands in nose and Bowman's membrane in eye
C Bowman's glands in nose and Bowman's membrane in tongue
D Bowman's glands in tongue and Bowman's membrane in nose

The correct answer is:
Bowman's glands in nose and Bowman's membrane in eye

Solution:
Bowman's glands are olfactory glands present in the nose. They are located just below the nasal epithelium and produce mucous to keep the olfactory epithelium moist. The cornea of the eye is made up of 5 layers: outer epithelium, anterior elastic lamina, substantia propria, posterior elastic lamina and inner epithelium. Outer part of the anterior elastic lamina, which is made up of collagen fibres, is called Bowman's membrane.

Topic: Biology, Neural Control and Coordination, NEET
Sister chromatids are found in

Options:
A mitotic metaphase
B meiotic metaphase
C late telophase
D both A & B

The correct answer is:
both A & B

Solution:
During metaphase, condensation of chromosomes is completed and they can be observed clearly under the microscope. This is the stage at which morphology of chromosomes is most easily studied. At this stage, metaphase chromosome is made up of two sister chromatids, which are held together by the centromere. Small disc-shaped structures at the surface of the centromeres are called kinetochores. These structures serve as the sites of attachment of spindle fibres (formed by the spindle fibres) to the chromosomes that are moved into position at the centre of the cell. This occurs in mitotic as well as meiotic metaphase

Topic: Biology, Cell Cycle and Cell Division, NEET
Sister chromatids of a chromosome have:

Options:
A Different genes at the same locus
B Different alleles at the same gene at the same locus
C Same alleles of the same gene at the same locus
D Same alleles at different Loci.

The correct answer is:
Same alleles of the same gene at the same locus

Solution:
Sister chromatids of a chromosome are formed as a result of DNA replication during the S phase of interphase. Thus, sister chromatids consist of the same alleles of the same gene at the same locus.

Topic: Biology, Cell Cycle and Cell Division, NEET
Six charges $+q,-q,+q,-q,+q$ and $-q$ are fixed at the corners of a hexagon of side $d$ as shown in the figure. The work done in bringing a charge $q_0$ to the centre of the hexagon from infinity is $\left(\varepsilon_0-\right.$ permittivity of free space):

Options:
A Zero
B $\frac{-q^2}{4 \pi \varepsilon_0 d}$
C $\frac{-q^2}{4 \pi \varepsilon_0 d}\left(3-\frac{1}{\sqrt{2}}\right)$
D $\frac{-q^2}{4 \pi \varepsilon_0 d}\left(6-\frac{1}{\sqrt{2}}\right)$

The correct answer is:
Zero

Solution:
Work done $=$ Change in potential energy
$\begin{aligned}
& \mathrm{W}=\mathrm{U}_f-\mathrm{U}_i \\
& \mathrm{~W}=0
\end{aligned}$
Hence, $W=0$

Topic: Physics, Electrostatics, NEET, NEET 2022 (Phase 2)
Six equal resistances are connected between points P,Q and R as shown in the figure. Then, the resistance will be maximum between

Options:
A P and Q
B Q and R
C P and R
D Any two points

The correct answer is:
P and Q

Solution:
The combination of resistances is shown in figure.
Maximum resistance will be between P and Q.
RPQ=RR3+R2R+R3+R2=5R2/611R/6=5R11
RQR=R2R+R311R/6=2R2/311R/6=4R11
RPR= R3R+R211R/6
=R2/211R/6=3R11
Hence, the maximum value lies between P and Q.

Topic: Physics, Current Electricity, NEET
Six moles of an ideal gas performs a cycle shown in the figure. If the temperature is TA=600 K, TB=800 K, TC=2200 K and TD=1200 K, the work done per cycle is

Options:
A 20Â kJ
B 30Â kJ
C 40 kJ
D 60Â kJ

The correct answer is:
40 kJ

Solution:
AâB and CâD
V= constant WAB=WCD=0
WBC=PÎV
WBC=nRÎTBC
WDA=nRÎTDA
Total work done in a complete cycle
Wtotal=WAB+WBC+WCD+WDA
Wtotal=0+WBC+0+WDA
Wtotal=0+nRÎTBC+0+nRÎTDA
Wtotal=nRTC-TB+TA-TD
Wtotal=40 kJ

Topic: Physics, Thermodynamics, NEET
Six moles of an ideal gas performs a cycle shown in the figure. The temperatures are TA=600 K, TB=800 K, TC=2200 K and TD =1200 K. The work done by the cycle ABCDA is

Options:
A 20 kJ
B 30 kJ
C 40 kJ
D 60 kJ

The correct answer is:
40 kJ

Solution:
Given, n=6
AB: Isochoric process, âWAB=0
BC: Isobaric process, âWBC=nRâT
=nRTC-TB
=6R2200-800
=8400R
CD: Isochoric process, âWCD=0
DA: Isobaric process, âWDA=nR âT
=nRTA-TD
=6R600-1200
= -3600R
âWcyclic=âWAB+âWBC+âWCD+âWDA
=8400R-3600R=4800R
=4800Ã8.3
=39840 J=40 kJ

Topic: Physics, Thermodynamics, NEET
Six negative equal charges are placed at the vertices of a regular hexagon. 6q charge is placed at the centre of the hexagon. Find the electric dipole moment of the system.

Options:
A zero
B 6qa

C 3qa
D qa

The correct answer is:
zero

Solution:
This system is a combination of six equal dipoles each of dipole moment p0=qa
From the polygon law of vector,
Σ p → = 0

Topic: Physics, Electrostatics, NEET
Six point masses of mass m each are at the vertices of a regular hexagon of side l. Calculate the force on any of the masses.

Options:
A $\frac{G{{m}^{2}}}{{{l}^{2}}}\left[ 1+\frac{1}{\sqrt{3}}+\frac{1}{2} \right]$
B $\frac{G{{m}^{2}}}{2{{l}^{2}}}\left[ 1+\frac{1}{\sqrt{3}}+\frac{1}{4} \right]$
C $\frac{G{{m}^{2}}}{{{l}^{2}}}\left[ 1+\frac{1}{\sqrt{3}}+\frac{1}{4} \right]$
D $\frac{G{{m}^{2}}}{2{{l}^{2}}}\left[ 1+\frac{1}{\sqrt{3}}+\frac{1}{2} \right]$

The correct answer is:
$\frac{G{{m}^{2}}}{{{l}^{2}}}\left[ 1+\frac{1}{\sqrt{3}}+\frac{1}{4} \right]$

Solution:
Correct Option is : (C)
$\frac{G{{m}^{2}}}{{{l}^{2}}}\left[ 1+\frac{1}{\sqrt{3}}+\frac{1}{4} \right]$

Topic: Chemistry, Gravitation, NEET
Six similar bulbs are connected as shown in the figure with a DC source of emf E, and zero internal resistance.
The ratio of power consumption by the bulbs when i all are glowing and ii in the situation when two from section A and one from section B are glowing will be,

Options:
A 4:9
B 9:4
C 1:2
D 2:1

The correct answer is:
9:4

Solution:
Case (i): When all bulbs are glowing, then,
Req=23R

Then, initially power consumption will be from the equation,

Power P = E2R

Pi=E2Req=3 E22 R ...1

Case (ii): When two bulbs in section A and one bulb in the section are glowing,
Req'=R2+R=32R
Pf=E2Req'=2E23R ...2

From above two equations, ratio of power is,

PiPf=94

Topic: Physics, Current Electricity, NEET, NEET 2019 (All India)
Six vectors $\vec{a}$ through $\vec{f}$ have the magnitudes and directions indicated in the figure. Which of the following statements is true?

Options:
A $\vec{b}+\vec{c}=\vec{f}$
B $\vec{d}+\vec{c}=\vec{f}$
C $\vec{d}+\vec{e}=\vec{f}$
D $\vec{b}+\vec{e}=\vec{f}$

The correct answer is:
$\vec{d}+\vec{e}=\vec{f}$

Solution:
If two non-zero vectors are represented by the two adjacent sides of a parallelogram, then the resultant is given by the diagonal of the parallelogram passing through the point of intersection of the two vectors
$$
\therefore \quad \overrightarrow{\mathrm{d}}+\overrightarrow{\mathrm{e}}=\overrightarrow{\mathrm{f}}
$$

Topic: Physics, Mathematics in Physics, NEET, NEET 2010 (Screening)
Sixty four identical sphere of charge q and capacitance C each are combined to form a large sphere. The charge and capacitance of the large sphere are

Options:
A 64 q, C
B 16 q, 4 C
C 64 q, 4 C
D 16 q, 64 C

The correct answer is:
64 q, 4 C

Solution:
64 drops have formed a signal drop of radius R. Volume of big drop = Volume of small' drops
â´43ÏR3=64Ã43 Ïr3
â R =4r
So, the total current is
Qtotal=64q
As, Câ²=QVand V=14ÏÎµ0QR;Câ²=4ÏÎµ0R
Câ²=4ÏÎµ04r
â Câ²= 4C

Topic: Physics, Electrostatics, NEET
Skeletal muscles come under the broad category of muscle tissue for the animals. How many of the following statements are correct related to the skeletal muscles.

I. They are closely attached to bones.

II. These are involuntary in the activity.

III. They are typically found within the blood vessel

IV. Several muscle fibers are enclosed by a sheath of connective tissue.

Options:
A 3
B 2
C 4
D 1

The correct answer is:
2

Solution:
Skeletal muscles are the voluntary type of muscle tissue giving conscious control over their contraction. They are typically found closely attached to the bones of the body. The muscle fibers making the skeletal tissue are bundled together by a sheath/covering of tough connective tissue. Smooth muscle is found in blood vessels and these are involuntary. Thus, statements I and IV are correctly describing skeletal tissue. Statement II and III describe smooth muscle instead of skeletal tissue.

Topic: Biology, Structural Organisation in Animals, NEET
Skin color inheritance observed in man is an example of

Options:
A Cytoplasmic inheritance
B Mendel's inheritance
C Plastid inheritance
D Quantitative inheritance

The correct answer is:
Quantitative inheritance

Solution:
When traits are controlled by three or more genes, they are called polygenic traits and their inheritance is called as polygenic inheritance. Human skin colour is a classic example following polygenic inheritance as the skin colour is regulated by three pairs of gene. Polygenic inheritance is influenced by the environment as well and not just the polygenes. In this inheritance, the phenotype reflects the contribution of each allele and not only the dominant ones. The effect of each allele is (quantitative) and donot show uniformity.

Topic: Biology, Principles of Inheritance and Variation, NEET
Skin colour in humans is an example of

Options:
A Polygenic inheritance
B Pleiotropy
C Qualitative traits
D More than one option is correct

The correct answer is:
Polygenic inheritance

Solution:
In humans, we do not just have tall or short people as two distinct alternatives but a whole range of possible heights. Such traits are generally controlled by two or more genes and are thus called as polygenic traits. The inheritance of polygenic traits is called polygenic or quantitative inheritance.
In quantitative inheritance, the dominant alleles have a cumulate effect, with each dominant allele expressing a part of the functional polypeptide, and the full trait is shown when all the dominant alleles are present, genes involved in quantitative inheritance are called polygenes.
E.g. Kernel colour in wheat, skin colour in humans, height in humans.

Topic: Biology, Principles of Inheritance and Variation, NEET