Which cells never divide by meiosis? (Check all that apply.)
_____ haploid cells
_____ diploid cells
_____ somatic cells
_____ germ-line cells
_____ zygotes
__X__ haploid cells
_____ diploid cells
__X__ somatic cells
_____ germ-line cells
__X__ zygotes
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In human embryonic development, which of the following pairs of hormones are released by the developing testes and result in development of the male reproductive tract and inhibition of the female reproductive tract?
A) testosterone and estrogen B) estrogen and progesterone C) testosterone and Müllerian inhibitory substance D) estradiol and estrogen E) testosterone and estradiol
The potential capacity to produce offspring is called:a
life history traits. b. fitness. c. age structure. d. density. e. fecundity.
Which of the following bacteria are responsible for more infections and more different kinds of infections?
A) Streptococcus B) Staphylococcus C) Salmonella D) Pseudomonas E) Neisseria
What specific challenge does Trypanosoma brucei present to the immune system?
A. It frequently changes its antigens, staying one step ahead of the host's antibody response. B. It specifically attacks T lymphocytes preventing their activation and crippling the cell-mediated immune response. C. It specifically attacks B lymphocytes preventing activation and antibody production. D. Its antigens are not recognized by B and T lymphocytes so these host defense cells don't respond to the infection.