If a microbiology lab student left the safranin out of the Gram stain procedure, what would be the result?
A) All cells would be purple.
B) Gram-positive cells would be purple and Gram-negative cells would be colorless.
C) All cells would be pink.
D) Gram-positive cells would be pink and Gram-negative cells would be purple.
E) Gram-positive cells would be colorless and Gram-negative cells would be pink.
B
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When Dr. Schmidt-Nielsen and his colleagues followed a "pulse" of 100% inhaled oxygen through the respiratory system of an ostrich, the oxygen pulse went to the
A. posterior air sacs to the lung and then to the anterior air sacs before being exhaled. B. anterior air sacs to the lung and then to the posterior air sacs before being exhaled. C. lung and then to the anterior air sacs and finally the posterior air sacs before being exhaled. D. lung and then to the posterior air sacs and finally the anterior air sacs before being exhaled. E. lung and then back out with exhalation—the air sacs were not involved.
Which of the following cell types does not move materials through the body of the plant?
A. sclerenchyma B. xylem vessel members C. sieve tube members D. tracheids E. sieve cells
Bulk flow in capillaries is driven by ____
a. gravity b. concentration gradients c. actual blood pressure d. pumping of the heart e. reciprocal exchange with oxygen
Which type of plant hormone is structurally similar to adenine?
a. brassinosteroid b. abscisic acid c. ethylene d. cytokinin e. systemin