How many different alleles for ABO blood types in the total human population exist?
a. two
b. three
c. four
d. six
e. nine
ANSWER: b
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Which receptor is associated with the perception of pain?
A. thermoreceptor B. chemoreceptor C. nociceptor D. photoreceptor
All of the terms listed below occur during interphase except
a. G1 phase. b. cytokinesis. c. chromosome replication. d. G2 phase. e. S phase.
Which statement best describes the limitations of using of humans in genetic studies of developmental biology?
A) The variation in human development between individuals is too large for genetic studies. B) It is impractical and unethical to conduct experimental manipulation or targeted mutagenesis of humans to examine the role of genes in development. C) It is impractical and unethical to examine and describe abnormalities of human development, such as birth defects. D) Genetic studies of human development are not necessary, because most problems in human development are due to environmental influences and not genetics.
The walls of fungi are reinforced with
a. cellulose. b. lignin. c. chitin. d. pectin. e. protein.