Which of the following statements about mRNA half-life is false?
(a) The half-life of mRNAs produced from different genes will vary more than the half-life of mRNAs produced from the same gene.
(b) The half-life of most eukaryotic-cell mRNAs is >24 hours.
(c) The half-life of most bacterial mRNAs is shorter than the half-life of a typical eukaryotic mRNA.
(d) The 5? and 3? untranslated regions of an mRNA often contain specific sequences that determine the lifetime of the mRNA molecule.
(b) Although there are mRNAs with long half-lives, the typical eukaryotic mRNA has a half-life of less than 30 minutes.
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In contrast to regulators, animals that are conformers
A. are able to alter their immediate external surroundings in order to maintain homeostasis. B. require large stores of ATP to maintain homeostasis. C. have an internal body composition that varies along with external changes. D. cannot live in extremely cold environments, such as the Antarctic Ocean. E. cannot adapt to the external environment.
All of the following statements about cellular trafficking are true except
A) COPII-coated vesicles move materials from ER to Golgi. B) COPI-coated vesicles move materials from Golgi to the secretory vesicle. C) movement may be mediated by microtubules. D) v-SNAREs occur in vesicles; t-SNAREs occur on target sites. E) tethering proteins mediate docking between target and vesicle.
Pinnipeds molt
a. in the ocean. b. on shore. c. in the winter. d. throughout the year. e. They do not molt.
Which term describes the long spongy bodies under the labia majora that run from the tip of the clitoris to either side of the vagina?
A. Seminiferous tubules B. Fallopian tubes C. Vasa deferentia D. Crura