Nonpolar hormones can pass through the intestinal cell membrane without being digested, and therefore can be taken orally. Which of the following hormones are available as pills?
A. insulin and growth hormone
B. thyroid hormone and steroid hormones
C. calcitonin and insulin
D. insulin and steroid hormones
E. calcitonin and thyroid hormone
B. thyroid hormone and steroid hormones
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A biologist discovered a new animal. Upon studying its embryonic development, she observed radial cleavage with the blastopore developing into an anus. This animal was categorized as a
A. parazoan. B. radiata. C. deuterostome. D. protostome. E. pseudocoelomate.
The persistence of the sickle-cell anemia allele
in the African population is the result of a. a high rate of mutation of the normal allele to the sickle-cell anemia allele. b. the advantage of the heterozygous form over the homozygous forms. c. nonrandom mating. d. a decline in the occurrence of malaria in Africa. e. genetic drift.
Gametetogenesis (gamete formation) is
a. the result of the process of mitosis. b. the pairing of homologous chromosomes. c. the formation of sex cells. d. the fusion of gametes. e. a process that occurs only in asexually reproducing forms.
What is a simple way for determining if an annelid is a polychaete or a clitellate?
A. The number of segments B. The amount of chaetae (setae) C. Possession of a closed circulatory system D. The layout of the digestive system