What kinds of bonds link the two strands of a double helix to each other?
A. hydrogen
B. ionic
C. hydrophobic
D. covalent
Ans: A. hydrogen
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The first evidence of a connection between genes and metabolism came from studies of alkaptonuria
conducted by ____.
a. Beadle and Tatum b. Griffith c. Watson and Crick d. Garrod e. Nirenberg and Leder
What do wax and testosterone have in common?
A) They are both proteins.
B) They are both steroids.
C) They are both lipids.
D) They are both hormones.
The _______ cells in the islets of Langerhans of the pancreas are responsible for secreting insulin.
a. alpha cells c. chief cells b. beta cells d. leukocytes
Over the past several decades, populations of Staphylococcus aureus (a type of bacteria that infects wounds) have become resistant to penicillin
You run the following experiment: Reference: Ref 14-1 In a different set of experiments, you identify two kinds of mutations in S. aureus. The first type of mutation makes the bacteria more susceptible to antibiotic X; the second type of mutation makes it more resistant to antibiotic X. Which type of mutation is more likely to occur in the population? A. the first type (more susceptible) B. the second type (more resistant) C. It depends if the cell population has been exposed to antibiotic X. D. It depends if either type of mutation confers additional survival benefits to S. aureus. E. There is no difference in likelihood because the mutation is a random event.