When a signal arrives at the cell, it gets transduced. What is meant by the term signal transduction?
A. The signal is inactivated, so that cell stops responding.
B. Signal transduction is how the receptor binds to the signal.
C. The signal is transmitted inside the cell in another form.
D. The mechanisms by which the cell responds to the signal are ducible.
Ans: C. The signal is transmitted inside the cell in another form.
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Which of the following statements is FALSE?
A) When plant cells are growing, they release expansins, which are enzymes that can expand the primary cell wall. B) The secondary cell wall often contains structural components, like lignin, that form a relatively rigid and complex network within the cell wall. C) A plant cell continues growing after the secondary cell wall forms but stops growing with the formation of the tertiary cell wall. D) Pectin is a component of the cell wall that attracts and holds water.
Which of the following is an example of a peptide hormone?
A. insulin B. adrenaline C. cortisol D. testosterone E. progesterone
Burning a log is an example of a combustion reaction. This type of reaction is a reverse reaction of photosynthesis. Based on this information, what products would be formed from burning a log?
A. carbon dioxide and water B. oxygen and carbon dioxide C. oxygen and water D. glucose and oxygen E. carbon dioxide and glucose
In a genetic cross between two bacteriophage T4 rII mutants, r+ recombinants are produced. The genetic changes in these two rII mutants must be
A) heterozygous. B) heteroallelic. C) homozygous. D) homoallelic. E) polymorphic.