Flatworms are very thin and can exchange materials across their surface. Flatworms lack which of the following anatomical systems?
A. respiratory
B. nervous
C. digestive
D. movement
E. excretion
Answer: A. respiratory
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Which of the following statements is (are) true
concerning promoters? a. They are short sequences in DNA. b. They are locations in DNA where regulatory proteins gather. c. They control transcription. d. They are associated with specific genes. e. All of these are true.
The amount of solar energy that any spot on the
surface of the earth receives is affected by a. the particulate matter and pollution in the air b. the angle at which the sun strikes the earth. c. the amount of atmosphere above the spot. d. all of these e. none of these.
A person who inherited the allele combination AA is ____
a. homozygous dominant b. homozygous recessive c. heterozygous d. codominant e. dominant
The most diverse group of placental mammals are the ____.
A. bats B. carnivores C. rodents D. moles and shrews E. whales and dolphins