Which of the following is not a major defining chordate characteristic?

a. blocks of muscles from myomeres
b. a pair of eyes at the anterior
c. a hollow, dorsal nerve cord
d. a notochord
e. a tail extending beyond anus


B; Neither tunicates nor lancelets have eyes. The other choices are all canonical chordate characteristics.

Biology & Microbiology

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During which of the following stages of the cell cycle would a chromosome consist of only a single chromatid?

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Viruses that infect bacteria are:

a. Not known to exist b. Prions c. Bacteriophages d. Composed of protein only e. Also capable of causing disease in humans

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Use the word bank to identify the labeled structures of the antibody in the diagram: antigen, antigen-binding site, variable region, constant region, light chain, heavy chain. Briefly describe the structure.

What will be an ideal response?

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In __________, one of the sperm cells in the pollen tube fertilizes the egg, forming a zygote; the other

fuses with the endosperm mother cell and gives rise to __________. Fill in the blank(s) with the appropriate word(s).

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