The gene that encodes small-subunit ribosomal RNA is useful for reconstructing the phylogeny of all organisms, because ________
A) the gene is subject to strong stabilizing selection
B) the gene's function has stayed unchanged in all organisms
C) all organisms have ribosomes with similar composition and structure
D) all organisms have the gene
E) All of the above.
E
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A doctor discovers that her patient can produce antibodies against some bacterial pathogens, but he is unable to protect himself against viral infections. The doctor suspects a disorder in her patient's
A. macrophages. B. B cells. C. cytotoxic T cells. D. plasma cells. E. suppressor T cells.
T or F: Muscle force is related to the physiologic cross-sectional area
What will be an ideal response?
Osmosis can only occur if water travels through the?
What will be an ideal response?
You study a group of ammonites (an extinct lineage of cephalopods) that lived during the Mesozoic. You measure the shell diameter of different fossil ammonite species
When you combine your data within each of six different time periods you obtain the following average shell sizes and corresponding standard errors. What rule does this data conform to? Time interval Mean shell diameter (+/– standard error) 245–214 MYA 15 mm (+/– 5 mm) 215–184 MYA 21 mm (+/– 7 mm) 185–154 MYA 36 mm (+/– 12 mm) 155–124 MYA 63 mm (+/– 21 mm) 125–94 MYA 72 mm (+/– 24 mm) 95–65 MYA 84 mm (+/– 28 mm) a. Biogenetic rule c. Cope's rule b. Allen's rule d. Bergmann's rule