Checkpoints in the cell cycle control system _________.
Fill in the blank(s) with the appropriate word(s).
Answer: regulate the cell cycle through a variety of stop and go signals
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In dry weather, plants reduce water loss by closing their
A. gap junctions. B. stomata. C. cell membranes. D. None of the answer choices is correct. E. vascular tissues.
Which of the following digestive system structures is greatly expanded in size in koalas, resulting in a very large surface area for prokaryotes to digest plant material?
A) stomach B) rumen C) cecum D) gall bladder
A lipid membrane is present in which of the following?
A. naked viruses B. enveloped viruses C. prions D. viroids E. both prions and viroids
The presence of a loop of Henle in nephrons is an evolutionary adaptation that enables mammals and birds to reabsorb water efficiently and produce a ________ urine.
A. hypertonic B. hypotonic C. isotonic D. osmolar