What is a challenge that organisms living in an intertidal zone face that other aquatic organisms normally do not face?
A. damage from pollution
B. changes in temperature at different depths
C. movement of water
D. light penetrating only through the photic zone
E. daily changes in water depth
Answer: E. daily changes in water depth
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Which of the following isnot an additional role for nucleosides and nucleotides?
A. primary energy currency of the cell (ATP) B. electron carrier (NAD+) C. methyl group donor (S-adenosylmethionine) D. regulatory molecule (cAMP) E. catalyst for splicing reactions (dUTP)
Oooof! You are so full! The holiday dinner you just ate has expanded your stomach beyond its usual capacity. Which type of receptor tells you so?
a. muscle spindles b. Golgi tendon organs c. gastric stretch receptors d. Merkel’s disks
Which bacterium causes infections in many burn victims?
A) Moraxella catarrhalis B) Pseudomonas aeruginosa C) Escherichia coli D) Bartonella bacilliformis
Members of the genus Mycoplasma are pleomorphic and stain Gram-negative because they
A. lack cell walls. B. have sterols in their cytoplasmic membranes. C. lack cytoplasmic membranes. D. have mycolic acid in their cell walls. E. have a rudimentary cell wall.