Which of the following is not a true statement about receptors that are localized to the nucleus?
A. They were synthesized in the cytosol.
B. They carry a nuclear-localization signal.
C. They bind polar ligands.
D. They moved through a nuclear pore.
C
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Which statement best explains contact inhibition?
a. Contact between neighbouring cells triggers reactions that lead to inhibition of mitosis. b. As cell number increases, the level of waste products increases, consequently slowing metabolism and leading to mitosis. c. As cell number increases, the protein kinases they produce compete with neighbouring cells, thus inhibiting mitosis. d. As neighbouring cells become more tightly packed together, their size is restricted and cytokinesis can no longer occur.
A botanist who wants to stimulate flower formation in response to light cues could treat the plants with
A) cytokinin. B) abscisic acid. C) florigen. D) auxin. E) ethylene.
Efflux pumps can be used to pump antibiotics out of a cell once they enter to protect the cell. This will be done against the concentration gradient of the antibiotic. Which of the active transports would most likely be used?
a. Symport b. Antiport c. Uniport
Answer the following questions true (T) or false (F)
1. B cell receptors are specific to only one antigen. 2. Antibodies may help phagocytes grab and ingest bacteria. 3. Smallpox vaccines used today are heat-killed cowpox viruses.