Which of the following is not a part of the type II topoisomerase mechanism?
A. The enzyme breaks two strands, each one forming an enzyme-linked intermediate through tyrosines in the active site.
B. The double-stranded segment of DNA that passes through the break is released through the C-gate.
C. ATP binding and hydrolysis are required for creating the double-stranded break.
D. ATP hydrolysis is coupled to the passage of the unbroken double-stranded DNA segment through the break.
E. The religated strand stays associated with the topoisomerase as it resets for another round of catalysis.
C
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What will be an ideal response?
An X-linked carrier is a
a. homozygous dominant female. b. heterozygous female. c. homozygous recessive female. d. homozygous male. e. heterozygous male
You discover a gene that results in a complete lack of hair in rats, and you name the gene "chromedome." A cross of homozygous normal and homozygous bald rats results in all bald rats. You conclude that the baldness allele is dominant, but when you repeat the cross with different rats none of the offspring are bald. Extremely puzzled you study your records and discover that in the first cross the bald rat was female, while in the second cross the bald rat was male. What do you conclude from this information?
A. chromedome is imprinted in males. B. chromedome is dominant in females and recessive in males. C. chromedome is dominant in males and recessive in females. D. chromedome is an X-linked gene. E. chromedome is imprinted in females.
The statistical study of populations including sex ratio, age structure, and predicting growth rates is called ________.
A. biometrics B. ethology C. demography D. population genetics