In prokaryotes, gene expression is regulated at the level of: (Select all correct choices)
A. transcription.
B. translation.
C. post-translational modification of RNA and
proteins.
A,B
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The masseter muscles originate on your cheekbones and insert into the posterior corners of the mandible (the lower jaw bone) underneath your ears. Will contraction of the masseter muscles open or close your jaw?
A. open B. close
Fight-or-flight reactions include activation of the _____
A) parathyroid glands, leading to increased metabolic rate B) anterior pituitary gland, leading to cessation of gonadal function C) adrenal medulla, leading to increased secretion of epinephrine D) pancreas, leading to a reduction in the blood sugar concentration
Imagine that you are performing a cross involving seed texture in garden pea plants. You cross true-breeding round and wrinkled parents to obtain F1 offspring. Which of the following experimental results in terms of numbers of plants are closest to what you expect in the F2 progeny?
a) 810 round seeds b) 810 wrinkled seeds c) 405:395 round seeds:wrinkled seeds d) 610:190 round seeds:wrinkled seeds
Bacteria in the intestinal tract can prevent pathogens
from causing disease by a. crowding them out. b. eating other bacteria. c. producing protein traps to kill them. d. submerging them in acid in the stomach. e. all of these.