Although corals can capture prey, they also depend on __________ for nutrition
A. a symbiotic relationship with the photosynthetic zooxanthellae
B. a symbiotic relationship with lichens
C. the dead animals found on the ocean floor
D. photosynthesis since they are part animal and plant
E. a symbiotic relationship with a fish
A
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Individuals that are heterozygous for sickle-cell anemia are more resistant to malaria than those that do not have a sickle-cell allele. Why does the sickle-cell allele not become fixed in the population?
A. Individuals homozygous for the sickle-cell allele do not have the same resistance to malaria. B. Individuals that are homozygous without the sickle-cell allele produce more offspring than those with the sickle-cell allele. C. Individuals that are homozygous for the sickle-cell allele have sickle-cell anemia, and are at a fitness disadvantage. D. Individuals heterozygous for the sickle-cell allele die earlier than either of the homozygous individuals. E. Analysis indicates the allele is becoming fixed in the population.
During days 8 and 9 after fertilization in humans, ____
a. amnion cleavage begins b. a blastocyst forms c. an embryonic disk is formed d. implantation occurs e. gastrulation occurs
In your genetics lab, you are following the expression of a given gene. In your experiment, you add acetyltransferase to a sample of DNA that contains your gene. Which of the following would you expect to see in your results, assuming you have the techniques to determine the possibilities?
a) Histones would become more positive which causes the chromatin to tighten for more gene expression. b) Histones would become less positive which causes the chromatin to tighten for more gene expression. c) Histones would become less positive which causes the chromatin to loosen for more gene expression. d) Histones would become less positive which causes the chromatin to loosen for less gene expression. e) Histones would become more positive which causes the chromatin to loosen for more gene expression.
Which of the following statements about allostery is true?
(a) Allosteric regulators are often products of other chemical reactions in the same biochemical pathway. (b) Allosteric regulation is always used for negative regulation of enzyme activity. (c) Enzymes are the only types of proteins that are subject to allosteric regulation. (d) Binding of allosteric molecules usually locks an enzyme in its current conformation, such that the enzyme cannot adopt a different conformation.