A new mRNA can pass through the pores of the nuclear membrane into the cytoplasm only if ________
a. it has been phosphorylated
b. it has been processed
c. motor proteins attach to a base sequence and link the molecule to cytoskeletal elements
d. proteins attach to a base sequence near the poly-A tail and temporarily block translation
b
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During specimen collection, an important thing to remember when handling a collection device with an oxygen-free atmosphere is to:
a. take care not to tip the container. b. hold the collected specimen in the refri-gerator until processing. c. hold the collected specimen in the incu-bator until processing. d. avoid opening the container in an aerobic atmosphere.
Given the fact that their respiration rate increases rapidly during activity but is slow to decrease following activity, does it seem likely that scorpions chase their prey over long distances?
a. Yes b. No
The carrying capacity of white-tailed deer in a certain habitat is 10 deer/km2. The deer population is presently 5 deer/ km2. Which of the following predictions is most likely for this deer population?
a. A population decrease. b. A population increase. c. A population that will remain at 5 deer/ km2. d. A population that will reach 30 deer/ km2 and then experience a crash. e. A population that will be controlled by intrinsic regulating mechanisms.
Which is incorrect about the Fc region of an immunoglobulin?
A) It determines the class to which the immunoglobulin belongs. B) It determines the antibody's distribution in the body. C) It contains an effector molecule that can fix complement. D) It contains an effector molecule that can bind to cells such as macrophages and mast cells. E) It forms the antigen binding sites.