What type of cells secrete antibodies?
A. Antigen-presenting cells
B. Memory B cells
C. Helper T cells
D. Plasma cells
E. Cytotoxic T cells
Answer: D
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Horizontal gene transfer
A) is rare and only occurs between closely related strains. B) is common and may sometime occur between unrelated organisms. C) does not provide an advantage to organisms. D) only occurs in prokaryotes.
Testosterone has important regulatory functions in humans and many other animals. Molecules with regulatory
functions like testosterone are called ____.
a. phytosterols b. enzymes c. lipoproteins d. hormones e. receptors
Which of the following is a type of epithelial
tissue that is several layers thick?
a. stratified b. loose connective c. dense connective d. simple e. more than one of these
Formation of a tetraploid plant species from two different diploid parental species of plants is an example of
A. punctuated equilibrium. B. gradualism. C. extinction. D. a postzygotic barrier to evolution. E. a prezygotic barrier to evolution.