The ________ ________ is the length of time it takes for a population of microorganisms to double in number.
Fill in the blank(s) with the appropriate word(s).
generation time
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The area of the retina that is richest in photoreceptors is called the ________
a. choroid b. fovea c. sclera d. optic nerve
How does the loop of Henle enable the mammalian kidney to produce hypertonic urine?
I-The ascending limb of the loop actively extrudes Na+. II-The descending limb interacts with the ascending limb to raise the osmolarity of the extracellular fluid in the renal medulla. III-The concentration is further enhanced by the presence of urea, which draws water out of the collecting ducts by osmosis. A. just I B. II and III C. just III D. I and II E. I, II, and III
Photosystem I and photosystem II are, respectively, part of
A. the carbon reactions only. B. the carbon reaction and the light reactions. C. respiration. D. the light reactions and the carbon reactions. E. the light reactions only.
A detectable variation in the genomes of different individuals of a population is known as:
a. DNA sequencing. b. DNA electrophoresis. c. DNA tandem repeats. d. a polymorphism. e. DNA profiling