Some prokaryotes have a capsule, which is an external layer of polysaccharides that protects the cells from physical
damage.
Indicate whether the statement is true or false.
ANSWER: True
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Male frogs give calls that attract female frogs to approach and mate. Researchers examined mating calls of closely related but separate species of tree frogs in South America. What outcomes could possibly occur where the ranges of two species overlap?
I) The species will interbreed, eventually fusing over time. II) A stable hybrid zone will form if hybrids are better adapted to the area of overlap than either parent species is. III) Species will continue to diverge and be isolated by behavioral or genetic mechanisms. A) I B) II C) III D) I, II, and III
Imagine that a DNA sequence of 5'-A-C-G-T-A-C-G-T-3' is altered to 5'-A-C-G-A-C-G-T-3'. This could happen as a result of a(n)
A) deletion mutation. B) translocation. C) inversion. D) nucleotide substitution mutation. E) insertion mutation.
Tungsten is a reagent used in the
A) acid-fast stain. B) electron microscopy stain. C) endospore stain. D) flagellar stain. E) negative stain.
After mitosis, the chromosome number of a daughter cell is __________ parent cell's.
A) the same as B) one-half C) rearranged compared to D) doubled compared to