Which of the following is the molecular mechanism responsible for genomic imprinting?
a. methylation
b. ligation
c. mutation
d. deletion
Ans: a. methylation
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Polyploidy is characterized by ____
a. the failure of homologous chromosomes to separate properly during meiosis b. a condition in which one chromosome is present in three copies c. a condition in which one member of a chromosomal pair is missing d. a chromosomal number that is not an exact multiple of the haploid set e. a chromosomal number that is a multiple of the normal haploid chromosomal set
The cells capable of releasing histamines are
a. mast cells and basophils. b. basophils and eosinophils. c. mast cells and eosinophils. d. natural killer cells and macrophages. e. all of these
The dominant vegetation of the temperate rain forest includes all of the following except:a
Sitka spruce. b. western red cedar. c. beech. d. Douglas fir. e. western hemlock
Which of the following has a four-chambered heart like humans?
A. crocodiles B. amphibians C. birds D. birds and crocodiles. E. All of the choices are correct.