Crossing over occurs during ________ and is important because it ________
A) telophase II; creates daughter cells
B) prophase I; generates variation
C) anaphase II; separates the homologous pairs
D) metaphase I; reduces the chromosome number by half
B
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During the early stages of sporulation in Bacillus subtilis, ________ is active in the forespore and ________ is active in the mother cell.
A. ?E; ?F B. ?F; ?K C. ?F; ?E D. ?K; ?F
How does the Hebbian principle apply to synaptic connections?
a. Synaptic connections are weakened in neurons with multiple inputs. b. Synaptic connections are disabled by rapid activation. c. Synaptic connections are strengthened by repeated activation. d. Synaptic connections lead to cytoplasmic fusion between neurons.
The number of currently described species on the planet is about ________.
a) 17,000 b) 150,000 c) 1.5 million d) 10 million
THe lipid bilayer is not permeable to ____
a. Carbon dioxide b. Lipids c. Oxygen d. Sodium ions