The target cells of glucagon are
a. the liver cells.
b. the skeletal muscle cells.
c. the fat cells.
d. all of these cells.
e. none of these cells
A
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You start to culture a petri dish of marine bacteria. Each day, the number of visible colonies growing on the agar surface increases in this fashion: 2, 4, 16, 32, 64, 128 . This growth pattern is best described as
a. logarithmic. b. logistic. c. exponential. d. quadratic.
Which of the following is not a known function of the cytoskeleton?
a. to maintain a critical limit on cell size b. to provide mechanical support to the cell c. to maintain the characteristic shape of the cell d. to hold mitochondria and other organelles in place within the cytosol e. to assist in cell motility by interacting with specialized motor proteins
When first used in medicine in the 1940s, penicillin was uniformly effective in killing the bacterium Staphyloccocus aureus. Today, ____________________ has led to an increase in antibiotic-resistant alleles, and humans are increasingly at risk from untreatable Staphyloccocus aureus infections.
a) uncleanliness in hospitals b) natural selection in Staphyloccocus aureus populations c) natural selection in human populations d) the substitution of methicillin for penicillin e) molecular genetics
Which of the following components of receptor mediated endocytosis of LDL is incorrectly matched with its function?
A.) adaptin: binds to the specific receptors and recruits clathrin B.) LDL receptors: form bridges between the LDL particle and adaptin C.) clathrin: forms the coated veiscle D.) lysosome: releases LDL from the receptor