Which is a correct statement about reptile reproduction compared to bird reproduction?
A. The eggs of both birds and reptiles have protective shells.
B. Birds are oviparous, reptiles are ovoviviparous.
C. Male or female reptiles reproduce asexually; birds do not.
D. Both exhibit external fertilization.
E. Both newly hatched birds and reptiles require parental care.
Answer: A
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About 80% of all land plants, including grasses, shrubs, and trees, form mycorrhizae. Mycorrhizae are best described as
A. parasitic associations between fungi and plant leaves. B. balanced competitive associations between plants and fungi. C. mutualistic associations between fungi and plant roots. D. parasitic associations between fungi and plant roots. E. mutualistic associations between fungi and plant leaves.
After three replications of a single DNA molecule,
what percent of the resulting molecules contain one strand of the “original” DNA? a. 0 percent b. 25 percent c. 50 percent d. 75 percent e. 100 percent
Which of the following is NOT a characteristic of a primary immune response?
A) The response is especially strong. B) The response is short-lived. C) Antigen-selected B or T cells differentiate into effector cells. D) Antigen-selected B or T cells proliferate E) It requires 10-17 days to initiate.
To form NADH from NAD+, two electrons and a proton are removed from an organic molecule. What term best describes the reaction in which electrons and a proton are removed from an organic molecule?
A. dehydrogenation B. decarboxylation C. isomerization D. condensation E. reduction