Which of the following E. coli polymerases functions in the replication of the chromosome?
A. DNA Pol I
B. DNA Pol II
C. DNA Pol III
D. DNA Pol IV
E. both DNA Pol II and Pol IV
C
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Which type of bond must be broken for water to vaporize?
A) ionic bonds B) both hydrogen bonds and ionic bonds C) polar covalent bonds D) hydrogen bonds E) both polar covalent bonds and hydrogen bonds
The water vascular system of echinoderms _____
A) functions as a circulatory system that distributes nutrients to body cells B) functions in locomotion and feeding C) is bilateral in organization, even though the adult animal is not bilaterally symmetrical D) moves water through the animal's body during suspension feeding E) is analogous to the gastrovascular cavity of flatworms
Which of the following involves positive feedback stimulation?
a. temperature control b. childbirth c. glucose concentration d. absorption of toxins e. muscle concentration
Hemophilia is an X-linked recessive trait in humans. If phenotypically normal parents have children without hemophilia, what information could be determined by a pedigree analysis?
A) Neither parent carries the hemophiliac allele. B) None of their children is a carrier of the hemophilia allele. C) None of their children could have hemophiliac children. D) The exact genotypes of the parents or children