Which of the following is one method in which a change in the DNA leads to genetic changes in a population?
A) genetic drift
B) mutation
C) founder effect
D) bottleneck effect
B
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Erythrocytes are the most numerous cells in human blood
Indicate whether the statement is true or false.
Which one of the following is NOT usually a symptom of cystic fibrosis?
A. Low fertility or infertility B. Frequent respiratory infections C. Difficulty breathing D. Loss of pancreatic function E. Problems with hearing and vision
In the citric acid cycle, the acetyl group is removed from acetyl CoA and attached to oxaloacetate to form
A. fumarate. B. malate. C. citrate. D. oxaloacetate. E. succinate.
Maintaining the ozone layer is crucial for life because it
a. absorbs visible light. b. absorbs high-energy UV radiation. c. blocks high-energy IR radiation. d. blocks low-energy IR radiation. e. absorbs low-energy UV radiation.