Auxins lengthen coleoptiles, shoots, and roots by

promoting cell __________. Fill in the blank(s) with the appropriate word(s).


Answer: enlargement

Biology & Microbiology

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A sudden or total lack of oxygen can cause unconsciousness in 5–10 seconds. Why?

a. The brain has very high energy requirements and lack of oxygen reduces available energy. b. Oxygen is required for ventilation and lack of ventilation causes fainting. c. Lack of oxygen causes an increase in carbon dioxide, which is toxic. d. The brain needs oxygen to breathe, and when oxygen is not available, it signals the nervous system to cause fainting.

Biology & Microbiology

Which of the following is NOT true about

enzymatic regulatory molecules?

a. they allow an enzyme to catalyze many, diverse reactions. b. they may cause the enzyme to change its overall shape. c. they may enhance the activity of an enzyme. d. they may inhibit the activity of an enzyme. e. they may bind directly to an enzyme’s active site.

Biology & Microbiology

Which growth response causes the shoots of a plant grown in the dark to grow upward?

A) phototropism B) thigmotropism C) gravitropism

Biology & Microbiology

A vaccine additive which enhances the body's natural immune response is called a(n)

A) adjuvant. B) toxoid. C) attenuant. D) recombinant. E) booster.

Biology & Microbiology