Changes in the DNA are called ________
Fill in the blank(s) with correct word
mutations
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For Mendel’s explanation of inheritance to be
correct, a. the genes for the traits he studied have to be located on the same chromosome. b. the combination of gametes at fertilization has to be due to chance. c. genes cannot be transmitted independently of each other. d. only diploid organisms demonstrate inheritance patterns. e. none of these apply.
Which of the following is directly involved in the initiation of dental caries?
A) sucrose B) lysozyme C) lactic acid D) crevicular fluid E) dentin
A digger wasp continues to close its nest even though the researcher has removed the nest's contents. This shows that nest-closing behavior in the digger wasp is
Select one: a. a learned behavior. b. an imprinted behavior. c. a fixed action pattern. d. an insight learning behavior. e. a classical conditioned behavior.
Dr. Edward Jenner realized that cows have a disease called cowpox, which is like a disease that infects humans called smallpox; Jenner noticed that milkmaids whose hands were infected with cowpox were not contracting smallpox. Jenner infected a child with the pus from a cowpox blister, and found that the child did not contract smallpox. Which statement represents a supporting hypothesis?
A. The cowpox virus prevented the small pox virus from entering the child's immune system. B. the smallpox virus was so similar to the cowpox virus that the child's immune system ignored the smallpox virus C. The cowpox infection will prevent the child from being infected by the small pox virus. D. The cowpox infection will have no effect on the child's immunity to the small pox virus.