Microfilaments are made of ________
A) tubulin B) actin
C) intermediate proteins D) phospholipids
Answer: B
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Much of our understanding of how large organisms respond to environmental variation is based on
using model species.
Indicate whether the statement is true or false.Ultraviolet light has a specific effect on the DNA molecule. It causes the formation of
a. thymine dimers. b. translocations. c. deletions. d. inversions. e. duplications.
Imagine that a mutation in a DNA molecule results in the codon CCU being changed to CCC. Both of these codons code for proline. What characteristic accounts for the fact that more than one codon can code for the same amino acid?
A) the ambiguity of the genetic code B) the redundancy of the genetic code C) the universality of the genetic code D) mutations in the genetic code
Members of the Enterobacteriaceae can be distinguished from each other by
A) the presence or absence of the enzyme oxidase. B) the ability to ferment lactose. C) motility. D) both motility and the presence or absence of the enzyme oxidase. E) both motility and the ability to ferment lactose.