According to the results of this experiment, germination of tobacco seeds during the first week is
(A) increased by exposure to light
(B) unaffected by light intensity
(C) prevented by paper towels
(D) accelerated in green-leaved seedlings
Ans: (A) increased by exposure to light
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When guard cells are filled with water,
a. stomata are open. b. stomata are closed. c. sugars diffuse into the sieve tube members. d. gases cannot diffuse into or out of the plant. e. more than one of these take place.
Members of the genus (Bacillus/Enterococcus/Mycobacterium) are part of the normal microbiota of humans.
Fill in the blank(s) with the appropriate word(s).
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Figure 27.5
Use the figure above to answer the following question.
The letter "A" in the accompanying figure represents ____.
A. pericycle B. endodermis C. primary xylem D. root cortex E. primary phloem
An immediate source of energy for exercising muscle cells is _____.
A. creatine phosphate B. aerobic respiration C. anaerobic respiration D. fermentation E. glycolysis