The most important ion in controlling the movement of water into and out of the guard cells is
A. hydrogen.
B. carbon.
C. nitrogen.
D. sodium.
E. potassium.
Answer: E
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Infections by "flesh-eating bacteria" can occur when exotoxins A, B, C, and E and the bacterial surface M protein of Streptococcus pyogenes act as superantigens
Indicate whether the statement is true or false.
Amed has scaly skin due to the X-linked recessive condition icthyosis. He is ________ for the trait.
A) autosomal dominant B) heterozygous C) homozygous D) hemizygous
Which statement concerning REM sleep is true?
a. During the REM stage, delta waves are emitted. b. Most people spend almost all of their sleep time in the REM stage. c. The preoptic area of the hypothalamus stimulates REM sleep. d. During REM sleep, blood flow to the entire brain decreases. e. REM sleep is absolutely necessary, as a lack of this stage causes anxiety and irritability.
In an evolutionary sense, what is meant by the term molecular clock?
What will be an ideal response?