Which of the following types of physical mutagens produces thymine dimer mutations?

A. ultraviolet light
B. X-rays
C. microwave
D. gamma rays
E. ionizing radiation


A. ultraviolet light

Biology & Microbiology

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The cardiac, pyloric, anal, and ileocecal sphincters are all part of the

(a) digestive tract. (b) respiratory tract. (c) circulatory system. (d) muscular system.

Biology & Microbiology

Therapies using stem cells are already used in:

A. bone marrow transplantation. B. treating Parkinson's disease. C. treating Alzheimer's disease. D. All three of these choices are correct. E. None of these choices are correct.

Biology & Microbiology

The smallest and most numerous blood vessels in the body are the

a. venules b. veins c. arteries d. capillaries

Biology & Microbiology

If the two parents are each heterozygous for widow's peak and having freckles, what is the chance that any of their children will have the same phenotype?

A) 1/16 B) 1/2 C) 3/16 D) 9/16

Biology & Microbiology