What provides the energy for the polymerization reactions in DNA synthesis?
A) ATP
B) DNA polymerase
C) breaking the hydrogen bonds between complementary DNA strands
D) the deoxyribonucleotide triphosphate substrates
Answer: D
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Many plants are capable of responding very rapidly to mechanical stimuli. For instance, Venus Flytraps respond more quickly than their insect prey can escape
A very mild touch, or a light breeze can cause the leaves of the Sensitive Plant to close tightly. This rapid transmission of touch is accomplished by A) Rapid changes in phloem pressure B) Efficient, rapid transport of auxin C) Self-propagating changes in membrane potential D) Release of volatile airborne signals E) All of the above are employed by these plants.
The main components of soil are
A. air and water. B. a mixture of soil particles of different sizes. C. both living organisms and decaying organic material. D. All of these are components that define soil.
Communication between cells occurs via ________ in plant cells and via ________ in animal cells
Fill in the blank(s) with correct word
To conserve precious salts, freshwater fish
A) drink large amounts of water and produce small amounts of urine. B) drink almost no water and produce large amounts of dilute urine. C) excrete salt ions and small amounts of urine. D) consume salt ions in food and eliminate water by osmosis.