In bacteria, which topoisomerase is responsible for unlinking catenated chromosomes after replication?
A. topoisomerase I
B. topoisomerase II
C. topoisomerase III
D. topoisomerase IV
E. topoisomerase V
D
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The collection of deleterious alleles in a population is called the
A) mutation load. B) mutation bottleneck. C) genetic load. D) genome polymorphism.
A house cat has the scientific name Felis catus. The term catus is the
A) species. B) genus. C) kingdom. D) order. E) family.
Red-green colorblindness is a recessive X-linked disorder. A woman who is homozygous for normal vision has children with a man who has red-green colorblindness. Which of the following phenotypes would NOT be possible in their children?
a) sons with red-green colorblindness b) daughters who are heterozygous for the red-green colorblindess gene c) daughters who have normal vision d) sons who have the normal allele
The eukaryotic cell cycle consists of four phases, in the following order:
A) S phase (DNA synthesis), mitosis, Gap 1, and Gap 2. B) Gap 1, mitosis, Gap 2, and S phase (DNA synthesis). C) Gap 1, Gap 2, mitosis, and S phase (DNA synthesis). D) S phase (DNA synthesis), Gap 2, Gap 1, and mitosis. E) mitosis, Gap 1, S phase (DNA synthesis), and Gap 2.