In some plants, companion cells become modified into phloem cells that facilitate the short-distance
transport of various organic solutes from the symplast into the apoplast.
Indicate whether the statement is true or false.
ANS: F, transfer cells; apoplast; symplast
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Some crenarchaeotes have growth optima above the boiling point of water (at atmospheric pressure)
Indicate whether the statement is true or false.
Which statement is true?
a. Translation cannot proceed until eIF-2 is phosphorylated. b. eIF4F bonds to the 40S ribosome after GTP is hydrolyzed. c. Phosphorylation of a protein can alter RNA stability. d. GTP bonds to the 5’ cap of the mRNA during translation.
The challenges in movement experienced by people with Parkinson disease are due to loss of dopamine-secreting neurons in the
A. cerebellum. B. medulla oblongata. C. somatosensory cortex. D. thalamus. E. substantia nigra.
Which two scientists evidenced evolution via natural selection as an idea whose time had come?
a. Darwin and Wallace b. Darwin and Lamarck c. Darwin and Malthus d. Lamarck and Wallace