When does phytochrome become active in seedlings?

a. when a seedling is exposed to wavelengths of blue light
b. when a seedling is exposed to wavelengths of red light
c. when a seedling is exposed to wavelengths of green light
d. when a seedling is exposed to wavelengths of yellow light


Ans: b. when a seedling is exposed to wavelengths of red light

Biology & Microbiology

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Phosphatases are a family of enzymes that specifically remove phosphate groups from proteins that were added by protein kinases. Vanadate is an inhibitor of phosphatases in eukaryotic cells

What effect would vanadate have on the response of cells to signals received by receptor kinases? A. The response of the cell would last longer than it normally would. B. The response of the cell would be shorter than it normally would. C. The signal would still bind the receptor, so there would be no effect.

Biology & Microbiology

Height, weight, and eye color are examples of

phenotypes that illustrate all BUT a. polygenic inheritance. b. continuous variation. c. pleiotropy. d. the action of several gene pairs each with additive effects. e. the cumulative effect of several gene products acting to determine phenotype.

Biology & Microbiology

Which of the following can be defined as a collection of structures involved in emotions and memory?

A) CNS B) limbic system C) autonomic system D) parasympathetic system

Biology & Microbiology

What causes mass extinctions?

What will be an ideal response?

Biology & Microbiology