The basic unit that structurally organizes a eukaryotic chromosome is the _____
a. higher-order coiling
b. double helix
c. base sequence
d. nucleosome
D
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Although we know of threats to about ____ wild plant species, the actual number is likely much higher
a. 5,000 b. 7,000 c. 12,000 d. 37,000 e. 130,000
which of the following accurately describes an operon?
A. a transcription unit that codes for 1 polypeptide and is controlled by one promoter and one terminator B. a transcription unit that codes for several polypeptides zand is controlled by one promoter and one terminator C. is present only in prokaryotes D. both a and b E. both b and c
Which of the following occurs subsequent to the
invasion of bacteria into a wound? a. complement activation b. capture of bacteria by lymph nodes c. binding of bacteria to B cells d. attraction of phagocytes by the chemotactic factors secreted by the bacteria e. all of these
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.