The theory of ________ proposed that sudden and widespread disasters that result in mass extinctions followed by repopulation could explain why species change over time.
A. natural selection
B. artificial selection
C. uniformitarianism
D. catastrophism
Answer: D
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The first land animals likely moved onto land how long ago?
a. 650 million years ago b. 450 million years ago c. 250 million years ago d. 150 million years ago e. 50 million years ago
In most vertebrates, the sperm cell normally contributes which of the following to the new organism?
A. Many mitochondria B. Significant amounts of RNA C. A haploid complement of chromosomes D. Most of the cytoplasm of the zygote E. Two sex chromosomes
Mycoplasmas are named for the large quantities of mycolic acid in their cell walls.
Answer the following statement true (T) or false (F)
Oral rehydration solutions that contain both salt and glucose are highly effective in treating severe dehydration caused by diarrhea and vomiting. However, glucose or salt alone are not effective. Why?
A. Sodium transport and glucose transport are coupled in the small intestine so that glucose accelerates absorption of salt and water. B. Water alone rushes through the digestive tract too quickly to be absorbed by the body tissues. C. ATP is required to transport sodium unless glucose is available for cotransport. D. Glucose without sodium is broken down too quickly in the mouth by saliva.