Answer the following question given this paragraph: Restriction enzymes or restriction endonucleases are prokaryotic enzymes that recognize and cut DNA at specific sequences, called restriction sites. It is believed that they evolved as a defense mechanism against foreign DNA, such as viral DNA. Over 3,000 restriction enzymes have been identified. Some of the more common restriction enzymes are shown in the table below, where up and down arrows show the sites of cleavage. Restriction enzymes are named based on the prokaryotic organism they are isolated from. For example, those isolated from Escherichia coli would begin with Eco. As the Table below shows, digestion with the restriction enzymes will result in overlapping or blunt ends. EcoRI produces overlapping "sticky" ends: the enzyme cleaves between the G and A on both strands. On the other hand, SmaII restriction enzyme cleavage produces "blunt" ends. The enzyme cleaves between the G and C on both strands. Q: Restriction enzymes or restriction endonucleases are prokaryotic enzymes that recognize and cut what at specific sequences? Choices: - mitochondria - bacteria - rna - dna A:
dna
(Question)
Answer the following question given this paragraph: The hydrogen bonding that occurs in water leads to some unusual, but very important properties. Most molecular compounds that have a mass similar to water are gases at room temperature. Because of the strong hydrogen bonds, water molecules are able to stay condensed in the liquid state. The Figure below shows how the bent shape and two hydrogen atoms per molecule allows each water molecule to be able to hydrogen bond to two other molecules. Q: Most molecular compounds that have a mass similar to water are in what state of matter at room temperature? Choices: - solid - liquid - vapor - gas A:
(Answer)
gas
Ques: Answer the following question given this paragraph: Q: When a plant has what deficiency, guard cells may lose turgor and close stomata? Choices: - cold - light - air - water A:
Ans: water
(Q).
Answer the following question given this paragraph: Refraction The changing of a light ray's direction (loosely called bending) when it passes through variations in matter is called refraction. Speed of Light The speed of light c not only affects refraction, it is one of the central concepts of Einstein's theory of relativity. As the accuracy of the measurements of the speed of light were improved, c was found not to depend on the velocity of the source or the observer. However, the speed of light does vary in a precise manner with the material it traverses. These facts have far-reaching implications, as we will see in Special Relativity. It makes connections between space and time and alters our expectations that all observers measure the same time for the same event, for example. The speed of light is so important that its value in a vacuum is one of the most fundamental constants in nature as well as being one of the four fundamental SI units. Q: The changing of a light ray's direction (loosely called bending) when it passes through variations in matter is called this? Choices: - wavelength - resonance - vibration - refraction A:
(A).
refraction
Ques:Answer the following question given this paragraph: Types of chemical reactions include synthesis, decomposition, replacement, and combustion reactions. Q: Synthesis, decomposition, replacement, and combustion are all types of what reaction? Choices: - natural - toxic - mineral - chemical A:

Ans:chemical
Answer the following question given this paragraph: You can tell that this sponge is saturated with water because when it is squeezed, the water pours out. When something is saturated with water, it already holds as much water as possible. Compounds called hydrocarbons, which contain only carbon and hydrogen, can also be saturated, but not with water. Q: What compounds contain only carbon and hydrogen? Choices: - carbonates - particles - molecules - hydrocarbons A:
hydrocarbons