Answer the following question given this paragraph: Diffraction is the bending of waves around a corner. Q: What is the bending of waves around a corner called? Choices: - reflection - propulsion - absorption - diffraction A:
diffraction
(Question)
Answer the following question given this paragraph: Unfortunately, maternal mt(DNA)is susceptible to mutations which are a cause of inherited disease, such as breast cancer. Although, it is important to note that most mutations do not lead to defected mtDNA. Heteroplasmy is the presence of a mixture of more than one type of mtDNA. Most people have homoplasmic cells, meaning that their cells contain only normal, undefected mtDNA. However, people with both normal, undefected mtDNA and not normal, defected mtDNA, may inherit mitochondrial diseases. The ultimate condition leading to disease is when the proportion of mutant mtDNA reaches a threshold, after which the cell can no longer cope, resulting in disease. This threshold varies among different tissues and different mutations. Q: What increases the chances of someone inheriting a mitochondrial disease? Choices: - presence of defect transgenic and defect mtdna - presence of defect transgenic and undefected mtdna - presence of defect ornithopods and undefected mtdna - presence of defect mtdna and undefected mtdna A:
(Answer)
presence of defect mtdna and undefected mtdna
Ques: Answer the following question given this paragraph: Sepals protect the developing flower while it is still a bud. Sepals are usually green, which camouflages the bud from possible consumers. Q: What protects a developing flower while it is still a bud? Choices: - shell - petals - lobes - sepals A:
Ans: sepals
(Q).
Answer the following question given this paragraph: Reptiles are a class of ectothermic, tetrapod vertebrates. They have several adaptations for living on dry land, such as tough keratin scales and efficient lungs for breathing air. They also have a three-chambered heart and relatively well-developed brain. Q: How many chambers are in a reptiles heart? Choices: - ten - two - five - three A:
(A).
three
Ques:Answer the following question given this paragraph: A common way to keep track of valence electrons is with Lewis electron dot structures . In an electron dot structure, each atom is represented by its chemical symbol, and each valence electron is represented by a single dot. Note that only valence electrons are shown explicitly in these diagrams. For the main group elements, the number of valence electrons for a neutral atom can be determined by looking at which group the element belongs to. In the s block, Group 1 elements have one valence electron, while Group 2 elements have two valence electrons. In the p block, the number of valence electrons is equal to the group number minus ten. Group 13 elements have three valence electrons, Group 14 elements have four, and so on. The noble gases in Group 18 have eight valence electrons, and the full outer s and p sublevels are what give these elements their special stability. Representative dot diagrams are shown in the Figure below :. Q: The group 18 gases that have 8 valence electrons are referred to as what type of gases? Choices: - novel - important - metal - noble A:

Ans:noble
Answer the following question given this paragraph: The spiral staircase in Figure below also contains an inclined plane. Do you see it? The stairs that wrap around the inside of the walls make up the inclined plane. The spiral staircase is an example of a screw. A screw is a simple machine that consists of an inclined plane wrapped around a cylinder or cone. No doubt you are familiar with screws like the wood screw in Figure below . The screw top of the container in the figure is another example. Screws move objects to a higher elevation (or greater depth) by increasing the force applied. Q: Screws move objects to a higher elevation by increasing what? Choices: - velocity - torque - kinetic energy - force applied A:
force applied