The protein that progressively unwinds DNA ahead of each replication fork is called
A) primase.
B) helicase.
C) topoisomerase.
D) telomerase.
E) ligase.
B) helicase.
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Luke sprained his ankle, tearing some of the collagen protein that forms his ligaments. Some types of collagen consist of three polypeptide chains twisted together to form a rope-like strand. What level of protein structure does this rope-like strand represent?
A. Primary B. Secondary C. Tertiary D. Quaternary
The gene for color blindness is a recessive allele located on the X chromosome. If a color-blind man and a color-blind woman have one son and three daughters, how many will be color-blind?
A. all children will be color-blind B. only the one son will be color-blind C. only the three daughters will be color-blind D. none of the children will be color-blind
Which of the following is a by-product of yeast fermentation?
A) Sugar B) Chitin C) Oxygen gas D) Carbon monoxide E) Carbon dioxide
Which statement about Alzheimer's disease is true?
A) Alzheimer's disease is suspected if a patient cannot retain his or her balance. B) Alzheimer's disease is age-related, increasing in frequency as people age. C) Alzheimer's disease often reverses or improves with time. D) Alzheimer's disease frequently involves positive changes in personality.