Viral growth in bird embryos can cause discrete, opaque spots in the embryonic membranes called
A. cytopathic effects.
B. pocks.
C. lysogeny.
D. budding.
E. plaques.
Answer: B
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Somatic system fibers in nerves carry
information a. to and from receptors. b. to and from effectors. c. from receptors in skin, tendons, and skeletal muscles. d. to skeletal muscles. e. from receptors in skin, tendons, and skeletal muscle and to skeletal muscles.
Which of the following statements is false?
a. Crossing over tends to reduce the frequency that two linked genes are inherited together. b. Independent assortment of homologous chromosomes during meiosis increases variation. c. Crossing over leads to variation. d. Abnormal number or structure of chromosomes may influence the course of evolution. e. The closer together genes are found on a chromosome the greater the chance that crossing over will occur between them.
Cells that produce the pigment found in the epidermis are called
a. Granstein cells. b. keratinocytes. c. melanocytes. d. Langerhans cells. e. adipose cells.
Primary carnivores are
a. tertiary consumers in the third trophic level. b. secondary consumers in the third trophic level. c. secondary consumers in the second trophic level. d. tertiary consumers in the fourth trophic level. e. also primary producers.