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
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Which of the following is NOT a characteristic of most animals?
A. They have Hox genes. B. They are heterotrophic. C. They have an extracellular matrix of proteins such as collagen. D. They have cell walls. E. They have a nervous system.
Tubal ligation causes sterility because ____
a. eggs are no longer produced b. the endometrium is unable to form c. sperm is unable to enter the female reproductive tract d. sex hormones are no longer produced by the ovaries e. eggs are unable to travel through the oviducts to the uterus
Passive transport of water is known as ________
Fill in the blank(s) with the appropriate word(s).
Which of the following is characteristic of REM sleep?
a. dreaming b. stage of sleep that occurs every 3-4 hours c. most of sleep is spent in this stage d. easily aroused e. little change in muscle tone