In gene expression, ________

A) DNA directs the synthesis of RNA that directs the synthesis of a polypeptide
B) DNA directs the synthesis of a polypeptide that directs the synthesis of RNA
C) RNA determines the sequence of DNA, which directs the synthesis of polypeptides
D) polypeptides direct the synthesis for both RNA and DNA


Answer: A

Biology & Microbiology

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A 6-year-old girl is diagnosed with a bullous impetigo infection. Based on this information, the catalase and coagulase results of the infecting organism are expected to be catalase-_____ and coagulase-_____

a. negative; negative b. positive; negative c. positive; positive d. negative; positive

Biology & Microbiology

A scientist wants to determine whether a mutant phenotype is due to the loss of gene C or gene D, which are both deleted in a mutant fly with abnormal eyes. Mutant flies with transgenic gene C have wild-type eyes, whereas mutant flies with transgenic gene D have abnormal eyes. What can be concluded from these results?

A) Either gene C or gene D is required for normal eye development. B) Both gene C and gene D are required for normal eye development. C) Gene C is required for normal eye development. D) Gene D is required for normal eye development.

Biology & Microbiology

Bone remodeling is LEAST likely to be used in ____

a. replacing old bone b. healing of injured bone c. bone growth in childhood d. blood cell formation e. calcium homeostasis

Biology & Microbiology

The average birth weight for human babies is about 3 kg. Which of the following terms best describes this?

A) artificial selection B) directional selection C) stabilizing selection D) disruptive selection E) sexual selection

Biology & Microbiology