The above Figure 26.13, shows a simplified phylogeny of closely related species of primates. This tree was proposed by comparing DNA sequence changes in the gene for cytochrome oxidase subunit II. The vertical scale represents time and the branch points represent common ancestors. What species did ancestor B give rise to?
A. Siamangs and orangutans.
B. All of the species except orangutans.
C. All of the species except siamangs.
D. All of the species except siamangs and pigmy chimps.
E. Gorillas, humans, and both types of chimps.
C. All of the species except siamangs.
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Chromosomal aberrations:
A. are caused by errors during meiosis. B. are typically only seen in the elderly. C. are usually fixed by DNA polymerase. D. can be caused by methylation. E. are not described by any of the answer
"H zones" in skeletal muscle are composed of
a. discs to which thin filaments are anchored. b. stacked thick filaments along with parts of thin filaments that overlap both ends. c. thin filaments but no thick filaments. d. thick filaments but no thin filaments. e. discs to which thick filaments are anchored.
Which of the following parts of a plant seed turns into the root system?
a. cotyledon b. epicotyl c. hypocotyl d. radicle
Which part of a synovial joint is a fluid-filled sac?
A. symphysis B. synovial membrane C. menisci D. bursa E. suture