Which features are required for efficient external respiration to take place?
A. The gases being exchanged must be present in a low concentration in order for diffusion to occur.
B. The gas exchange region must be moist, thin and have a large surface area.
C. Gas exchange can only occur at a temperature lower than the body temperature of the organism.
D. The gas exchange needs to occur in an aquatic environment in order to be efficient.
E. The gas exchange region must be dry, thin and have a large surface area.
Answer: B
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True-breeding pea plants with inflated, yellow pods were crossed with true-breeding plants with constricted, green pods. The F1 progeny all had inflated, green pods
When the F1 is allowed to self-fertilize, what fraction of the F2 progeny will have constricted, yellow pods? A. 1/4 B. 3/4 C. 1/16 D. 3/16 E. 9/16
In a growing population, the youngest age classes have
A. the highest number of deaths/year. B. the fewest individuals. C. the most individuals. D. the smallest number of deaths/year. E. the most individuals and the largest number of deaths/year.
Differentiate between primary, secondary, tertiary, and quaternary structure of proteins
What will be an ideal response?
The MHC complex is a set of genes that
A. encodes cell recognition molecules. B. is located on chromosome 6. C. produces molecules to which antigens must attach in order to activate cell-mediated immunity. D. prevents the immune system from attacking the body's own tissues. E. has all of these traits.