Methylated histone tail amino acids are associated with chromatin that is
A) either open or closed.
B) open only.
C) closed only.
D) newly replicated.
E) about to replicate.
A) either open or closed.
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What is the oxidized form of the most common electron carrier that is needed for both glycolysis and the Krebs cycle?
A. ATP B. FAD C. pyruvate D. NAD+ E. acetyl-CoA
Frederick Griffith was a microbiologist who observed that
A) DNA contains nitrogen and phosphorus. B) proteases disrupt transformation from nonvirulence to virulence. C) DNA from heat-killed viruses transforms virulent viruses. D) nonvirulent bacteria become virulent when mixed with heat-killed virulent bacteria.
An animal that can maintain a constant internal body temperature regardless of environmental changes is called
a. homotherm b. cold-blooded c. an endotherm d. an ectotherm
What effect is warming predicted to have on migration behavior?
A) Birds will depart for migration earlier and return later. B) Birds will depart for migration later and return later. C) Birds will depart for migration earlier and return earlier. D) Birds will depart for migration later and return earlier.