A phylogenetic tree is constructed for 5 species using DNA sequences. Which species is the closest relative of Species 1?
A. Species 2: AGTCG
B. Species 3: TTTTG
C. Species 4: CGCTG
D. Species 5: CATAG
Answer: B. Species 3: TTTTG
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What is a muscle fiber?
A. A single cell of a muscle B. A group of muscle cells that make up the same muscle group C. The myosin that makes up the contractile unit of a muscle cell D. The connective tissue outer covering of a muscle
Methanogens are always engaged in relationships with other microbes because methane production requires
A. energy provided by another microbe. B. interspecies hydrogen transfer. C. removal of oxygen from the environment by another microbe. D. None of the choices are correct.
The genetic variability of a population is solely dependent on the generation of mutations
a. True b. False Indicate whether the statement is true or false
Which proteins form channels in the membrane that allow selected polar molecules and ions to pass through and
across the membrane?
a. transport proteins b. recognition proteins c. receptor proteins d. cell adhesion proteins e. nuclear proteins