Which statement about the cytoskeleton is correct?
a. Microfilaments are narrower than both intermediate filaments and microtubules.
b. Microfilaments resist compressive forces on the cell and help it to retain its shape.
c. Intermediate filaments provide pathways for organelles to follow during cell division.
d. Microtubules are involved in movement external to the cell but not internally.
a. Microfilaments are narrower than both intermediate filaments and microtubules.
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An example of a cyclical disease is
A) diphtheria. B) smallpox. C) influenza. D) anthrax.
Frameshift mutations (select all that apply)
A. cause the insertion or deletion of a single amino acid from the polypeptide chain. B. result in premature stop codons. C. change the entire amino acid sequence downstream from the site of the insertion or deletion. D. are known risk factors in most forms of cancer, including breast and colon cancer. E. are known risk factors in breast cancer, but not colon cancer.
The best outgroup to use for resolving phylogenetic relationships of vascular plants is the ____ because all of its
character states are considered ancestral.
a. angiosperms b. ferns c. conifers d. cycads e. ginkgophytes
Two species of tree frogs that live sympatrically in the northeastern United States differ in ploidy: Hyla chrysoscelis is diploid, and Hyla versicolor is tetraploid
The frogs are identical in appearance, but their mating calls, which females use to find mates, differ. Which difference most likely evolved first? A) polyploidy B) difference in mating calls C) Polyploidy and different mating calls must have evolved at the same time.