When a cell secretes a growth factor that binds to receptors on its own membrane preventing it from proliferating, this is an example of ____.
A. direct intercellular signaling
B. endocrine signaling
C. contact-dependent signaling
D. paracrine signaling
E. autocrine signaling
E. autocrine signaling
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Vertebrate cells possess a protein that binds to clusters of 5-methylcytosine and ensures the gene will stay in the "off" position. This control of gene regulation is a result of
A. translation. B. enhancer expression. C. methylation. D. promoter expression. E. operator suppression.
In mixed assemblages, baboons sometimes see predators that impala do not hear, and impala sometimes hear predators that baboons do not see. In both cases, the flight of one species alerts the other to danger. This interaction is an example of:
a. an indirect relationship b. commensalism c. mutualism d. competition e. symbiosis
Beta- carotene is converted to vitamin ___ in
the cells of the small intestine.
a. B12 b. A c. E d. C e. D
The photosynthetic electron transport causes the accumulation of protons in which part of the chloroplast?
A. outer membrane B. stroma C. matrix D. internal thylakoid space