A cell is dividing by binary fission. What can you conclude?
a. Mitosis has taken place without cytokinesis.
b. Homologous chromosomes have already paired.
c. The cyclin-Cdk complex is no longer phosphorylating enzymes.
d. The cell cycle is out of control.
e. The cell is prokaryotic.
e
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An epitope is part of an antibody's:
A. constant region of a heavy chain. B. antigen. C. hypervariable region. D. fab fragment.
Steroid hormones are synthesized from _____
a. amines c. proteins b. peptides d. cholesterol
The major difference between protostome animals and deuterostome animals is _______.
a) whether or not they reproduce sexually or asexually b) the presence or absence of a gastrovascular cavity c) which opening to the digestive system forms first d) their type of symmetry
Which cells aid in the operation of the nervous system but are unable to conduct nerve impulses?
A. goblet cells B. neuroglia C. intercalated disks D. neurons