Which of the following is a region of DNA at the end of a linear chromosome?
A. Telomere
B. Intron
C. Exon
D. Primer
Answer: A
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Any genetic differences between individuals in a population are called
A. markers. B. alleles. C. polymorphisms. D. SNPs.
Which embryonic tissue is incorrectly associated
with its derivative? a. skin; mesoderm b. nervous system; ectoderm c. liver; endoderm d. circulatory system; mesoderm e. brain; ectoderm
Which sentence describes how the metabolic rate of an endotherm compares with the metabolic rate of an ectotherm as the environment gets colder?
a. The metabolic rate in an endotherm goes down, while the metabolic rate of an ectotherm goes up. b. The metabolic rate in an endotherm goes down, as well as the metabolic rate of an ectotherm. c. The metabolic rate of an endotherm goes up, as well as the metabolic rate of an ectotherm. d. The metabolic rate in an endotherm goes up, while the metabolic rate of an ectotherm goes down.
A 39-year-old woman is in her sixth week of pregnancy. Due to her advanced age, she is at higher risk for having a baby with Down's syndrome than younger pregnant women. She would like to find out as early as possible whether or not her baby has Down's syndrome. Her doctor should suggest
A. chorionic villi sampling. B. amniocentesis. C. a pedigree analysis. D. genetic counseling.