Which of the following does NOT occur in prophase I of meiosis?
A) Condensation of chromatin
B) Tetrad formation
C) Crossing over
D) Synapsis
E) Cytokinesis
E
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Which of the following is a characteristic of sea stars?
a. two stomachs b. thin arms c. suspension feeders d. a notochord
Binding of a protein hormone may lead to formation of a(n) __________, which relays a signal into the cell. Fill in the blank(s) with the appropriate word(s)
The release of cyclic AMP as a second
messenger is a response to ____ hormones. a. peptide b. steroid c. protein d. peptide and protein e. peptide, steroid, and protein
Classification of protozoans is based primarily on the type of motility observed in the trophozoite stage. Identification can also be made by
A) Examination of tissue specialization B) Examination of the cyst C) Determining a lack of nuclei D) Determining the level of multicellularity