What type of DNA damage that involves disruption of single chemical bonds, sometimes causing base changes

a) Point lesion
b) Main chain scission
c) Atrophy
d) Cross linking


Ans: a) Point lesion

Biology & Microbiology

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The ultimate source of energy flowing into nearly all ecosystems is

A. wind. B. sunlight. C. electricity. D. radioactivity.

Biology & Microbiology

Fossils of plants found in deeper geologic layers do not show vascular tissues, while fossils in shallower geologic layers include some specimens with and some without vascular tissues. Thus, vascular tissue in plants is considered a ____ character.

a. ancestral b. mosaic c. primitive d. derived e. physiologically essential

Biology & Microbiology

Split or interrupted genes have been found in eukaryotes but not in bacteria or archaea.

Answer the following statement true (T) or false (F)

Biology & Microbiology

Which portion of the brain is responsible for primitive emotions such as fear, rage, and sexual desire?

A) Thalamus B) Pons C) Medulla D) Reticular formation E) Limbic system

Biology & Microbiology