The structure labeled "7" is the
a. food vacuole.
b. gullet.
c. macronucleus.
d. micronucleus.
e. mitochondrion.
C
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Carbon dioxide enters the inner spaces of the leaf through the _____
A) cuticle B) epidermal trichomes C) stoma D) phloem E) walls of guard cells
Which of the following processes can be used to bring nutrients into a cell against a concentration gradient?
A. Passive diffusion B. Active transport C. Facilitated diffusion D. Active transport and facilitated diffusion
Which of the following scientists demonstrated
for the first time that molecules of life could have come from nonliving entities (gases, water, and spark discharge)?
a. Crick and Orgel b. Wallace c. Miller and Urey d. Chargaff e. Cuvier and Lyell
The greatest number of ATP molecules is
produced in a. glycolysis. b. alcoholic fermentation. c. anaerobic electron transfer. d. electron transfer phosphorylation. e. the Krebs cycle.