The common cold can be transmitted through a virus left on a door handle by an infected person. This mode of transmission is classified as:
a. respiratory
b. intestinal discharge
c. fomite-borne
d. open lessions
Ans: c. fomite-borne
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Assuming complete dominance, what is the expected ratio of phenotypes of the offspring following the cross of two heterozygotes?
A. 1:2:1 B. 3:1 C. 1:1 D. 4:1
Which of the following is not true of the nucleolytic proofreading reaction of bacterial RNA polymerase?
A. Water is the nucleophile. B. It occurs when the enzyme backtracks after incorporating a mismatched base. C. rNTP is the product. D. It involves the melting of several RNA-DNA base pairs. E. All of the choices given are true.
Which organelle functions in the recapture of energy from organic compounds?
a. Golgi body b. mitochondria c. lysosome d. ribosome e. endoplasmic reticulum
What type of mutation produces no significant change in a functional protein?
A) frameshift mutation B) substitution mutation C) normal mutation D) neutral mutation