Allosteric inhibition generally results from ____
a. excess substrates
b. binding of regulatory molecules at sites other than the active sites
c. a change in the temperature of the system
d. a lack of coenzymes
e. changes in pH
ANSWER: b
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For a gene with two alternative alleles, A (with a frequency of p) and B (with a frequency of q), the term in the algebraic form of the Hardy-Weinberg equilibrium for the heterozygote genotype frequency is
A. p2. B. q2. C. 2pq. D. (p+q)2. E. 2Aa.
Most eukaryotic genes are cloned directly into the vector for expression in prokaryotes
Indicate whether this statement is true or false.
Unattached earlobes (EE or Ee) are described in the textbook as dominant over attached earlobes (ee). A couple both have unattached earlobes. Both notice that one of their parents on both sides has attached earlobes (ee). Therefore, they correctly assume that they are carriers for attached earlobes (Ee). The couple proceeds to have four children.
A. The children must repeat the grandparents' genotype (Ee). B. If the first three are heterozygous, the fourth must be homozygous recessive. C. Two heterozygous, one homozygous recessive, and one homozygous dominant is a likely outcome, but all heterozygous, or two, three, or all four homozygous are also possible. D. They can be certain that three will be heterozygous and one homozygous recessive. E. All children must have unattached earlobes since both parents possess the dominant gene for it.
Which of the following statements BEST explains the role of meiosis in reproduction?
A. Meiosis makes it possible for a zygote to have the correct number of chromosomes. B. Meiosis increases the chances of fertilization because it produces four daughter cells. C. Meiosis results in offspring with genotypes that are not exact copies of the parents. D. Meiosis allows chromosomes to exchange genetic material through crossing over.