During extended periods of dehydration, tardigrades ____
a. enter suspended animation
b. migrate to the soil subsurface
c. enter small ponds and lakes
d. climb inside a plant leaf and form cysts
e. replace the water in their cells with salt
ANSWER: a
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Microorganisms play key roles in the cycling of important nutrients in plant nutrition, particularly those of
A) carbon. B) nitrogen. C) sulfur. D) carbon, nitrogen, and sulfur.
Which statement is true of cephalochordates?
a. They lack pharyngeal slits. b. They have existed for 500 million years. c. They have well-developed brains. d. They are excellent hunters.
Which of the following statements about the regulation of respiration is false?
a. Respiratory centers in the medulla control the transition from inspiration to expiration. b. Carbon dioxide concentration is the most important chemical stimulus for regulating respiratory rate. c. Chemoreceptors in the walls of various arteries are sensitive to carbon dioxide levels in the blood. d. A group of neurons in the ventral medulla only become active when we need to breathe forcefully. e. Chemoreceptors may be sensitive to oxygen, carbon dioxide, and/or hydrogen ion concentration.
What evidence supports the hypothesis that the nuclear envelope of eukaryotes arose from infolding of the plasma membrane?
A. Eukaryotes and prokaryotes differ in control of gene expression. B. No modern bacteria have infolded plasma membranes. C. The nuclear membrane allows separation of transcription and translation. D. The nuclear membrane and endoplasmic reticulum (ER) of modern eukaryotes are continuous.