Chromatids that are attached at the centromere
are called what kind of chromatids?
a. Mother
b. Daughter
c. Sister
d. Programmed
e. either mother or da
C
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A type of transport of a solute across a membrane, up its concentration gradient, using protein carriers driven by the expenditure of chemical energy is known as
A. osmosis. B. diffusion. C. facilitated transport. D. active transport. E. exocytosis.
Which neurotransmitter diffuses across the synaptic gap, rather than being released by synaptic vesicles?
1.Dopamine 2.Gammaaminobutyric acid (GABA) 3.Nitrous oxide (NO) 4.Serotonin
Saber teeth found in different groups of extinct carnivorous mammals are considered ________ structures, as the fossil record shows that saber teeth evolved independently among the groups.
Fill in the blank(s) with the appropriate word(s).
How many sperm cells are produced for every one primary spermatocyte?
A. 8 B. 2 C. 4 D. 12