The principal government agency responsible for tracking infectious diseases in the United States is the
A. United States Department of Agriculture.
B. Infection Control Committee.
C. Centers for Disease Control and Prevention.
D. World Health Organization.
E. National Institutes of Health.
Answer: C
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Which one of the following statements does not accurately describe segregation of the sex chromosomes?
A. In human males, segregation of the X chromosome from the Y chromosome occurs during anaphase I of meiosis. B. In humans, half of the fertilized eggs are expected to be male and half are expected to be female; this 1:1 ratio is characteristic of Mendelian segregation. C. The secondary sex ratio of males to females at birth usually shows a slight excess of males. D. In humans, the sex at each birth is not a random process because there are often large families with either all girls or all boys. E. Females are slightly less likely to survive from conception to birth, but males are slightly less likely to survive from birth to reproductive maturity.
Unlike in animal meiosis, meiosis in plants gives rise to
a. diploid spores. b. haploid spores. c. diploid gametes. d. haploid gametes. e. cells without walls.
Which of the following statements about UV radiation is true?
a. It is necessary for the body to make vitamin B. b. The amount of UV radiation that reaches the Earth's surface is fairly constant. c. The ozone hole is responsible for the Greenhouse Effect, but has no impact on levels of UV radiation. d. Individuals with less melanin suffer less wrinkling and skin cancer. e. Exposure to ultraviolet rays causes the epidermis to thicken and produce more melanin.
A process called ____ proposes that species adapt and change due to the environment.
Fill in the blank(s) with appropriate word(s)