Which of the following statements about B cells is true?
A. Some B cells become memory cells.
B. B cells change into plasma cells after encountering an antigen and then produce antibodies.
C. B cells develop and mature in the bone marrow.
D. B cells carry receptor molecules on their cell surfaces.
E. All of these are true.
Answer: E
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Crossing over
a. generally results in binary fission. b. involves centrioles. c. involves breakages and exchanges between sister chromatids. d. results in new combinations of alleles being channeled into the daughter cells. e. does all of these.
How is environmental impact measured in a population?
A. number of individuals dying each generation plus birthrates B. population size and resource production C. population size and resource consumption D. All of these are used to measure environmental impact. E. None of these are used to measure environmental impact.
In humans, a zygote with ________________ has only one copy of a particular chromosome monosomy.
Fill in the blank(s) with the appropriate word(s).
The collection of genetic material from all of the normal microbiota that reside on the human body is known as the
A. human microbiome. B. human biome. C. human genome. D. human microcommunity.