Proteinacious projections from the surface of a bacterium that are used to mediate conjugation are called sex ________, whereas projections that mediate attachment to surfaces such as host cells are called ________.
Fill in the blank(s) with the appropriate word(s).
pili; fimbriae
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Which of the following cells transport sugars over long distances?
A) parenchyma cells B) collenchyma cells C) sclerenchyma cells D) tracheids and vessel elements E) sieve-tube elements
In aerobic respiration, the reaction of glucose with oxygen yields:
a. carbon dioxide only b. water only c. pyruvate d. carbon dioxide and water e. carbon dioxide, water, and pyruvate
Which of the following statements concerning intracellular receptors is FALSE?
a. Some bind hydrophobic signaling molecules. b. Some function as transcription factors. c. They diffuse across the plasma membrane of target cells. d. The ligand-receptor complex can activate genes. e. The ligand-receptor complex can inactivate genes.
Describe how halophiles metabolize nutrients in environments that contain a high salt concentration.
What will be an ideal response?