The pyrimidine bases in DNA are
a. adenine and guanine.
b. adenine and cytosine.
c. cytosine and thymidine.
d. cytosine and guanine.
Ans: c. cytosine and thymidine.
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Three the SSU rRNA sequences of 3 organisms have been compared. For organisms 1 and 2, two of the twelve nucleotides in the sequence are different. For organisms 1 and 3, six of the twelve nucleotides are different. Which organism has greater evolutionary distance from organism 1?
A. The evolutionary distance is the same. B. Organism 2 C. Organism 3 D. Evolutionary distance cannot be predicted from this data.
In an ideal, unlimited environment, a population's growth follows a(n) ________ model
A) exponential B) density-dependent C) logistic D) boom-and-bust
Why do chemical bonds form?
What will be an ideal response?
Which of the following statements is false regarding the differences between bacterial and eukaryotic cytoskeletal proteins?
A. Eukaryotic cells have cytoskeletal fibers comprised of tubulin and actin proteins, whereas bacterial cells lack cytoskeletal proteins. B. Cytoskeletal proteins in both eukaryotes and bacteria function in cell division, protein localization and determination of cell shape. C. The bacterial protein FtsZ is a homologue of the eukaryotic protein tubulin, and MreB and Mbl are homologues of actin. D. Proteins in the cytoplasm of bacterial cells are structurally similar to the tubulin and actin found in eukaryotic cells.