Which of the following statements is true?
a. The left and right portions of this life cycle illustrate asexual and sexual reproduction,
respectively.
b. The left and right portions of this life cycle illustrate sexual and asexual reproduction,
respectively.
c. Both portions of this life cycle illustrate asexual reproduction, because this organism does
not reproduce sexually.
d. Both portions of this life cycle illustrate sexual reproduction, because this organism does
not reproduce asexually.
e. Meiosis occurs in both portions of the life cycle.
A
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Organisms that grow near deep-sea volcanic vents are likely to be
A. psychrotrophic. B. psychrophilic. C. mesophilic. D. thermophilic.
Answer the following statements true (T) or false (F)
1. All human warts are caused by viruses in the genus Papillomavirus. 2. Chickenpox and shingles are caused by the same virus. 3. Koplik spots are a sign of smallpox. 4. Mumps is a rather mild disease, without any serious complications. 5. West Nile virus is most commonly transmitted by tick bite.
Induced pluripotent stem cells (iPS cells) are produced by _____
a. transferring a vitamin A gene into rice plants b. reprogramming adult cells by transferring certain master control genes into the cells' nuclei c. mutating certain genes in human blastocysts d. harvesting multipotent stem cells from umbilical cord blood e. harvesting enzymes from cadavers, and then using the enzymes to reprogram adult cells
Dasypeltis scabra is one of the best studied species of egg-eating snakes. Which of its following characteristics would strongly suggest that it has a built-in egg-cracker?
a. pushing the egg against the rim of the bird's nest b. pushing the egg against ventral hypophyses c. pushing the egg out of the mouth d. pushing the egg against a ribbed trachea