Which of the following is a true statement about growth in plants?
a. Only primary growth is localized at meristems.
b. Some plants lack secondary growth.
c. Only stems have secondary growth.
d. Only secondary growth produces reproductive structures.
e. Monocots have only primary growth, and eudicots have only secondary growth.
Ans: b. Some plants lack secondary growth.
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Many male songbirds are brightly colored. However, the color of the birds is determined by a balance of
A. natural selection against bright colors by predation and sexual selection in favor of bright colors. B. gene flow that reduces bright colors and natural selection in favor of bright colors. C. mutations that reduce bright colors and sexual selection in favor of bright colors. D. mutations that reduce bright colors and gene flow in favor of bright colors. E. natural selection against bright colors by predation and mutations that introduce bright colors.
Which of the following is/are a benefit of genetic testing? Select all correct choices
A. Newborns can be screened for treatable diseases. B. Individuals can find out whether or not they carry harmful recessive alleles. C. Adults can find out whether or not they have specific risk factors for some diseases. D. Physicians can use the results of genetic testing to engineer drugs specific for an individual's genotype. E. None of these.
Which of the following is not true of the regulation of the arabinose operon?
A. CRP activates expression when bound to cAMP. B. AraC protein recruits RNA polymerase when bound to arabinose. C. Arabinose binds to AraC protein, decreasing its affinity for a DNA site near the promoter. D. Arabinose binding alters the conformation of the dimerization domain of the AraC protein.
The per capita growth rate (r) is ____ per
mouse per month in a population of 1,000 mice where 500 mice are born and 400 mice die monthly. a. 0.1 b. 0.2 c. 0.3 d. 0.4 e. 0.5