Oak trees and many other plant species have years in which they have synchronous production of many progeny by all individuals in a population. This is known as
A. sympatry.
B. crypsis.
C. semelparity.
D. masting.
D. masting.
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Which of the following is an advantage of molecular pharming compared to expression of mammalian proteins in bacteria?
A. Mammalian and bacterial genes use different genetic codes. B. Mammals are easier to grow in the lab than bacteria. C. Molecular pharming is cheaper than growing bacteria. D. Proteins are more likely to function properly when expressed in mammals. E. Post-translational modifications do not occur in mammals.
What is the atomic mass of the atom identified as A in the accompanying figure?
a. 2 amu
b. 6 amu
c. 8 amu
d. 12 amu
e. 18 amu
An injection of pooled human gamma globulin may provide passive immunity to humans from hepatitis A because it contains __________.
A) antibodies B) T helper cells C) T cytotoxic cells D) B cells
The mechanism for the filtration of the blood within the nephron involves __________.
a. high hydrostatic pressure of blood forcing water and small molecules out of the capillary b. the active transport of Na+ and glucose followed by osmosis c. both active and passive secretion of ions and toxins into the tubule d. the high osmolarity of the medulla that was created by active and passive transport of salt from the tubule and passive diffusion of urea from the collecting duct e. a lower osmotic pressure in Bowman's capsule compared to that in the glomerulus