At which one of the following stages of the cell cycle does a chromosome develop into two sister chromatids?
A) mitotic phase
B) S phase
C) G1 phase
D) G2 phase
E) G0 phase
B
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Which visual problem is the result of an inherited genetic disorder of the X chromosome?
a. Macular degeneration b. Lack of focus c. Colorblindness d. Glaucoma e. Cataract
The 30-cm floral tube of the flower Angraecum and the 35-cm proboscis of its hawk moth pollinator are the result of
a. preadaptation. b. adaptive radiation. c. coevolution. d. convergent evolution. e. key innovation.
Four of the five answers listed below are innervated by the autonomic nervous system. Select the
exception. a. skeletal muscles b. smooth muscles c. heart d. endocrine glands e. exocrine glands
Which of the following disorders is described as follows: damage to motor nerves innervating skeletal muscle; skeletal muscles weaken; death usually results within five years of diagnosis?
A) amytrophic lateral sclerosis B) pleurisy C) cystic fibrosis D) emphysema E) botulism