The wings of birds and insects are ________ structures.

A. analogous
B. molecular
C. simple
D. homologous
E. vestigial


Answer: A

Biology & Microbiology

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Koopman’s research on mouse meiosis showed that

a. there is a meiosis promoting gene. b. a meiosis inhibiting gene leads to retinoic acid production. c. retinoic acid prevents meiosis. d. the Cyp26b1 gene is expressed in testes but not ovaries. e. there is no effect if male mice do not have a Cyp25b1 gene.

Biology & Microbiology

In the pelagic province of the open ocean ________ and ________ are the primary producers

a. algae, bacteria b. fungi, bacteria c. corals, algae d. corals, bacteria e. sea grasses, algae

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Which of the following animals does not have

a true brain but rather has a pair of ganglia?

a. jellyfish b. planaria c. earthworms d. grasshoppers e. more than one of these animals has ganglia

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Leaves are connected to the stem's vascular system through the

A. petiole B. leaf veins C. epidermis D. blade

Biology & Microbiology