Which of the following is a true statement concerning sexual selection?
a. Intrasexual selection leads to the death of many males in combat with other males.
b. Showy secondary sexual characteristics cannot be explained by natural selection.
c. Sexual selection can result in sexual dimorphism.
d. In most vertebrates, females court the males.
e. There is no evidence that intrasexual selection takes place between females.
Answer: c. Sexual selection can result in sexual dimorphism.
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Which of the following statements is
INCORRECT about eukaryotic chromosomes?
a. The number of chromosomes varies from one species to another. b. All eukaryotes have the same system of autosomes and sex chromosomes. c. A chromosome consists of DNA associated with histone proteins. d. After duplication, all paired chromosomes are attached at the centromere. e. After duplication, each chromosome consists of two sister chromatids.
Carbonic anhydrase
a. combines with water to form carbonic acid. b. dissociates into bicarbonate and hydrogen ions. c. is normally found in red blood cells. d. is responsible for maintaining the high levels of carbon dioxide in the lungs and the low levels of carbon dioxide in the body tissues. e. includes all of these descriptions.
The spreading of cancer cells, wound healing, and blood clotting all rely on the same type of cell movement called
A. crawling. B. swimming. C. waving. D. whipping.
Third phase of mitosis; chromosomes are aligned at the metaphase plate.
What will be an ideal response?