In nerve impulse transmissions, the neuron sending the message across the synapse is called the
A. postsynaptic cell.
B. Schwann cell.
C. presynaptic cell.
D. motor cell.
E. receptor neuron.
C. presynaptic cell.
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You purchase two identical houseplants and place them side by side on your windowsill. You water both plants equally. One plant, plant a, you leave alone. On the other plant, plant b, you inject florigen into the cells of the apical meristem. Which of the following would you expect to occur?
A. Both plants will produce flowers at the same time, but plant b will have more of them. B. Plant b will produce a flower at its apical meristem. C. Once the flower is gone, the apical meristem will develop again, and plant b will continue to grow from that stem. D. In subsequent years, plant b will only generate flowers in the same place. E. While flowering, the leaves will stop growing on plant b because florigen inhibitsleaf meristems. F. Once the flower is gone, plant b will grow taller, but only from growth of lateral meristems.
Greenhouse effect
What will be an ideal response?
Which of the following best describes the definition of a gene?
A. the protein product that genetic material produces B. genetic information that produces a product, either proteins or RNA C. a section of DNA that produces a single protein product D. a collection of polypeptides that fold to form a complex protein
Plants stay standing upright because of turgor pressure caused by:
A) water rushing into the cells, keeping the cells tight. B) cell walls of the plants supporting and keeping the plants standing upright. C) solutes rushing into the cells, keeping the cells tight. D) bones that run through the plant, holding it upright.