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.
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During which of the following stages of the cell cycle would a chromosome consist of only a single chromatid?
A) G1 B) G2 C) mitotic prophase D) mitotic metaphase E) All of the choices are correct.
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).
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
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?