Leaf openings Tiny openings in the epidermis of the leaf that allow air to enter into the leaf are called
a) thylakoids.
b) stroma.
c) stomata.
d) grana.
e) thylakoid spaces.
Ans: c) stomata.
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Which of the following are the mechanoreceptors that detect motion and sense gravity?
A. baroreceptors B. stereocilia C. hair cells D. semicircular canals
Which area of the brain helps to translate thoughts into speech by controlling tongue, throat, and lip muscles?
a. amygdala b. Broca's area c. hypothalamus d. limbic system e. pineal body
In muscle tissue, if there is not enough oxygen for aerobic respiration to occur, the muscle cell
A. can produce ATP by fermentation. B. cannot make ATP. C. uses creatine phosphate instead of ATP for energy. D. can produce ATP from fats. E. depletes its reserves of lactic acid.
Why do RNA viruses appear to have higher rates of mutation?
A) RNA nucleotides are more unstable than DNA nucleotides. B) Replication of their genomes does not involve proofreading. C) RNA viruses can incorporate a variety of nonstandard bases. D) RNA viruses are more sensitive to mutagens.