What is unusual about phage MS2 infection of Escherichia coli?
A) All proteins are synthesized simultaneously during infection so there are no early and late proteins.
B) It attaches to the host's pilus rather than the cell's surface.
C) It enters through a host cell porin.
D) More than one MS2 phage can be present in an individual E. coli cell.
Answer: B
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The DNA molecule usually is made up of how many
strands? a. 1 b. 2 c. 3 d. 6 e. 12
How does cellular respiration differ in prokaryotes and eukaryotes?
a. Eukaryotes use substrate-level phosphorylation; prokaryotes use oxidative phosphorylation. b. Eukaryotes perform reactions in mitochondria; prokaryotes use the plasma membrane. c. Eukaryotes use NAD+/NADH as electron acceptors; prokaryotes use FAD+/FADH2. d. Eukaryotes do not use oxygen; prokaryotes only use oxygen. e. Eukaryotes metabolize only glucose; prokaryotes metabolize only galactose.
Red blood cells are formed at a rate of
a. 2?3 million per second. b. 2?3 million per minute. c. 2?3 million per hour. d. 10 million per day. e. 50 million per hour.
Our normal blood pH should be in a fairly narrow range. Imagine you sit down to eat a large meal with cola, tomato-based sauce, and a salad with many citrus fruit slices. Identify the one statement that does not apply as one of the likely outcomes of your meal.
A. Your blood and body fluids will likely become more basic, with a higher pH than the normal range.
B. The cola, tomato, and citrus fruits will add hydrogen (H+) to your blood and body fluids.
C. All of the answer choices are correct.
D. Your body will produce buffer molecules to help neutralize acids you ate, so your blood pH doesn't change much.
E. Your blood and body fluids will likely become more acidic, with a lower pH than the normal range.