The membranes of winter wheat are able to remain fluid when it is extremely cold by _____
A) increasing the percentage of unsaturated phospholipids in the membrane
B) increasing the percentage of cholesterol molecules in the membrane
C) decreasing the number of hydrophobic proteins in the membrane
D) cotransport of glucose and hydrogen
E) using active transport
Answer: A
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Turgor pressure is the result of:
A. the activity of the contractile vacuole. B. water accumulation within a cell. C. the rigidity of the plasma membrane. D. All of the above answers are correct.
Once transduction of a signal is complete, the receptor and its bound signal molecule are removed
from the cell surface by ____.
a. hydrolysis b. diffusion c. endocytosis d. pinocytosis e. exocytosis
Radioactive isotopes have ____
a. excess electrons b. excess protons c. excess neutrons d. insufficient neutrons e. insufficient protons
Frederick Griffith discovered
A) transformation. B) transposons. C) the lac operon. D) DNA. E) conjugation.