NADPH contains the pentose sugar ________ and the nitrogenous base ________.
A) glucose; thymine
B) deoxyribose; cytosine
C) deoxyribose; nicotinamide
D) ribose; adenine
E) ribose; nicotinamide
D) ribose; adenine
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What is the function of bactoprenol?
A) It is a hydrophobic alcohol that transports peptidoglycan precursors across the cytoplasmic membrane. B) It is responsible for forming the peptide cross-links between muramic acid residues in adjacent glycan chains. C) It triggers the recruitment of FtsZ and the initiation of the divisome. D) It supplies the energy necessary for transpeptidation to occur.
Which energy source is a nonrenewable resource?
A) solar energy B) hydrogen fuel cell C) wind power D) natural gas
What happens during countercurrent exchange in fishes?
A) Gas exchange occurs as blood and water move in opposite directions across a respiratory surface. B) Gas exchange occurs as blood and water move in the same direction across a respiratory surface. C) Oxygen enters the blood by diffusion, and carbon dioxide exits the blood by active transport. D) Oxygen enters the blood by active transport, and carbon dioxide exits the blood by diffusion. E) Oxygen and carbon dioxide move in opposite directions across the respiratory surface by facilitated diffusion.
You are working with a specific enzyme-catalyzed reaction in the lab. You are a very careful experimentalist, and as a result, at the beginning of each of your experiments, you measure the temperature in the lab. On days 1 through 5, the temperature in the lab was 20oC. Today is day 6 of your experiment, and the temperature in the lab is 30oC. How do you predict that this will alter the rate of your enzyme-catalyzed reaction?
A. It will decrease the rate. B. It could possibly increase or decrease the rate. C. It will increase the rate. D. It will not affect the rate.