Carbon dioxide enters the leaf, and oxygen exits, through tiny pores called _______________.
Fill in the blank(s) with the appropriate word(s).
Ans: Stomata
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Plasma membrane proteins might be involved
in
a. cell-to-cell recognition. b. signal recognition. c. transport of nutrients. d. metabolic activities. e. all of these
How does anaerobic respiration differ from aerobic respiration?
a. Anaerobic respiration produces CO2. b. Anaerobic respiration produces ATP. c. Anaerobic respiration involves an electron transport chain. d. Anaerobic respiration utilizes O2 as the terminal electron acceptor. e. Anaerobic respiration utilizes NO3? as the terminal electron acceptor.
Which of the following is a source of vitamin K for humans?
A) Bacteroides thetaiotetraiotamicron digests foods, which release vitamin K. B) Escherichia coli in their digestive tract produces vitamin K. C) S. epidermidis releases vitamin K from dead cells. D) their diet only
The high levels of toxic alkaloids in the skin of the brightly-colored poison dart frog to prevent predation is an example of _______.
a. mimicry b. a mechanical defense c. a chemical defense d. camouflage