To start the transcription process, a large molecule, __________________, recognizes a _______________________.
a) DNA polymerase; termination site
b) RNA polymerase; promoter site
c) DNA polymerase; promoter site
d) DNA polymerase; promoter site
e) RNA polymerase; messenger RNA
Answer: b) RNA polymerase; promoter site
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If a gardener cuts the apical meristem of a plant, lateral buds begin to grow, which causes a bushier shape to develop. This is because the apical meristem normally secretes auxins that
A. suppresses the growth of lateral buds. B. suppresses the growth of the apical meristem. C. stimulates the growth of the apical meristem. D. stimulates the growth of lateral buds. E. stimulates the growth of roots.
Which process propels the food down the esophagus into the stomach?
a. glycolysis b. plasmolysis c. emulsion d. peristalsis e. segmentation
All of the following statements concerning nitrogen fixation are true EXCEPT which one?
A. The amount of carbon that is taken up by plants and microbes can be dictated by how much nitrogen is available to support growth. B. Nitrogen fixing microbes convert N2 to ammonia. C. The products of nitrogen fixation are incorporated into amino acids and nucleic acids. D. Nitrogen fixation does not affect the rate of carbon flux.
When leaf cells lose so much water that turgor pressure falls, the plant:
A. wilts B. closes up the protein channels through which water is lost C. takes in water from air D. dies E. starts to grow