Neoteny refers to:
A. the case where a sexually mature
organism still retains the physical
characteristics of the juvenile form.
B. the case where a sexually mature
organism will lose most of the physical
characteristics of the juvenile form.
C. the case where a sexually immature
organism retains the physical characteristics
seen in the adult form.
D. the case where a sexually immature
organism will lose most of the physical
characteristics of the juvenile form.
A
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The constant region of an antibody molecule is
A) the binding site for antigens. B) part of the heavy chains only. C) similar in all antibody molecules. D) the binding site for two antigens.
Nonpolar signal molecules enter the cell by ____
a. facilitated diffusion b. simple diffusion c. osmosis d. active transport e. receptor-mediated endocytosis
Which of the following occurs immediately after a haploid spore germinates?
a. A gametophyte is created by mitosis. b. A gametophyte is created by meiosis. c. A sporophyte is created by mitosis. d. A sporophyte is created by meiosis.
Echinoderms and chordates are
a. deuterostomes. b. protostomes. c. animals whose blastopore becomes a mouth. d. both b and c.