Regulatory regions of a eukaryotic gene all contain which of the following sequences, which regulate transcription of genes located on the same chromosome as the sequences?
A) zinc fingers
B) cis-acting regulatory sequences
C) homeodomains
D) trans-acting regulatory sequences
E) leucine zippers
B
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Which statement is true?
a. Antibodies are bound to plasma cells. b. Antibody neutralization kills cells that have already been infected. c. Temporary immunity can be transferred between individuals. d. Complement activation occurs within neutrophils.
If a single-celled freshwater organism such as a
protistan is transferred to saltwater, which of the following is likely to happen?
a. The cell bursts. b. The cell shrinks. c. Salt is pumped out of the cell. d. Enzymes flow out of the cell. e. There is no effect.
The resident microbiota have no role in defense against pathogen invasion
Indicate whether the statement is true or false
What evolutionary model for the maintenance of sexual reproduction do the following data appear to support?
a. Muller's ratchet b. the red queen hypothesis c. the Fisher–Muller hypothesis d. the environmental unpredictability hypothesis