The current problem with the genetically modified Hawaiian papaya plants that were first created in the 1980s is that they __________.
a. spoil too quickly
b. contain substances toxic to humans
c. are no longer able to reproduce
d. are not resistant to a root fungus
Answer: d. are not resistant to a root fungus
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The primary difference between estrous and menstrual cycles is that _____
A) the endometrium shed by the uterus during the estrous cycle is reabsorbed with no extensive fluid flow out of the body, whereas the shed endometrium of menstrual cycles is excreted from the body B) behavioral changes during estrous cycles are much less apparent than those of menstrual cycles C) season and climate have less pronounced effects on estrous cycles than they do on menstrual cycles D) copulation normally occurs across the estrous cycle, whereas in menstrual cycles copulation only occurs during the period surrounding ovulation
A model is used by ecologists to
A) prove how nature works by demonstrating cause-and-effect relationships. B) analyze data that have been collected during an experiment. C) make predictions about how nature works using a set of explicit assumptions. D) observe how nature works in an experimental setting.
Gene amplification involves:a
increasing the affinity of a gene to DNA polymerase. b. extra replication of genes that specify a certain gene product only in cells needing this product. c. improving the accuracy by which a gene is copied to produce an mRNA molecule. d. enhancing the activity of RNA polymerase. e. increasing the size of the gene that encodes a needed protein.
Lenski and Travisano compared what happened to the size of cells in 12 replicate lines of E. coli. The results of the experiment graphed in the figure above indicate that:
a. there is a competition for limited resources in nature. b. the average cell volume decreased substantially over the first 2,000 to 3,000 generations of the experiment. c. the average cell volume increased substantially over the first 2,000 to 3,000 generations of the experiment. d. A and B. e. A and C.