Which hypothesis states that the synthesis of DNA or RNA from the small molecules in the ocean would have come after the evolution of the plasma membrane and enzymes?
A. clay-catalyst hypothesis
B. protein-first hypothesis
C. chloroplast
D. RNA-first hypothesis
Answer: B
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DNA polymerase III
A. synthesizes an RNA primer. B. is needed for adding nucleotides during mRNA synthesis. C. synthesizes new DNA only in the 5' to 3' direction. D. cannot add nucleotides to the lagging strand.
Carotenoids are accessory pigments that ____
a. absorb yellow and red light to assist in photosynthesis b. capture energy from light and use it directly in cellular respiration c. are masked by the presence of chlorophyll throughout the growing season d. absorb blue and violet wavelengths and reflect green and yellow e. reflect blue wavelengths
This tissue lines blood and lymph vessels
a. A b. B c. C d. D e. E
During the first phase of glycolysis, because glucose is relatively stable and not easily broken down, two ____
reactions take place to transfer a phosphate group from ATP to the sugar. a. redox b. exergonic c. metabolic d. hydrolysis e. phosphorylation