Packages of vegetable seeds typically include an ideal planting depth. If planted too deep, the seeds will not germinate. Why will an excess depth affect the germination of the plant?

A. Circadian rhythms are disrupted.
B. Thigmotropism is disrupted.
C. Statoliths can no longer move.
D. Phytochromes can no longer absorb light.
E. The apical meristem cannot reach the surface of the soil.


D. Phytochromes can no longer absorb light.

Biology & Microbiology

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The inclusive term that describes all of the DNA in the nucleus of a cell is its 

A. genome. B. chromosome. C. gene. D. proteome.

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There are currently no known predatory bacteria that are adapted to invade or kill nearby cells

Indicate whether the statement is true or false.

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The following amoeboid protozoans are important sources of silica deposits in some areas of the world:

a. diatoms. b. silicoflagellates. c. radiolarians. d. foraminiferans. e. ciliates.

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The method of grouping organisms that are most closely related to each other, and the ancestors they were derived from, is referred to as which of the following?

a. cladistics b. phylogenetics c. taxonomy d. molecular systematics

Biology & Microbiology