Which genus contains Gram-positive bacteria?
a. Neisseria
b. Staphylococcus
c. Kokuria
d. Salmonella
Ans: b. Staphylococcus
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In the context of chemical evolution, DNA's structure is interesting because it suggests a possible copying mechanism. What about DNA's structure facilitates copying?
A) It has the same number of purines and pyrimidines. B) The nitrogenous bases are located on the inside of the double helix. C) The strands of the double helix are complementary. D) DNA always goes from 5 prime to 3 prime.
You observe two populations of chimpanzees using sticks to dig termites out from nests for food. One population uses long sticks; the second population uses short sticks
Which of the following observations would NOT support the hypothesis that the choice of stick length is a learned behavior? A. There are equal numbers of short and long sticks in the environment of each population. B. The population using long sticks has mostly long sticks in its environment. C. The chimpanzees using short sticks have obtained them by breaking long sticks. D. Young chimpanzees in both populations start out using sticks of many different sizes. E. Individuals that don't use the common stick length for that population catch fewer termites.
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.
How are these two amino acids attached?
A) amino group to amino group
B) amino group to carboxyl group
C) carboxylic acid group to carboxyl group
D) through a hydrolysis reaction