Signaling molecules such as peptide hormones and growth factors bind to receptors on the cell surface,
which subsequently triggers reactions in the cell. These reactions include ____.
a. initiation of cell division
b. stopping cell division
c. slowing the rate of cell division
d. causing cells to enter the G0 state
e. both initiation of cell division and causing cells to enter the G0 state
A
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If while investigating spontaneous generation, Pasteur had his laboratory located in a stable
A. the results would, most likely, have supported the idea of spontaneous generation. B. the results would, most likely, have not supported the idea of spontaneous generation. C. this would have had no effect on his results. D. this would have shown his love of horses.
When plants are produced by cloning, which process is most directly involved?
a. mitotic cell division b. binary fission c. meiotic cell division d. gamete production e. budding
What structure is formed from both fetal and maternal tissue?
A. chorion B. placenta C. yolk sac D. amnion
Genetic engineering started with ____
a. bacteria b. viruses c. fungi d. plants e. animals