In the fractionation of homogenized cells using centrifugation, the primary factor that determines whether a specific cellular component ends up in the supernatant or the pellet is the _____
A) relative solubility of the component
B) size and weight of the component
C) percentage of carbohydrates in the component
D) presence or absence of lipids in the component
B
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The predominant mechanism driving cellular differentiation is the difference in gene _____
A) expression B) sequences C) order D) replication
Activators and inhibitors that bind to enzymes at positions other than the active site of the enzyme bind to a(n) ____ site on the enzyme
Fill in the blank with the appropriate word.
Which of the following is true of chemical synapses? Select all correct choices
A. They are more common than electrical synapses. B. Their vesicles fuse with the presynaptic membrane to release neurotransmitters. C. Once released, their neurotransmitter molecules may return to the presynaptic cell.
Which of the following is a test cross? (a “dash” means the allele's identity is unknown)
a. R-MM ? R-mm b. RRMM ? rrmm c. R-M- ? R-Md. rrMM ? RRmm e. R-M- ? rrmm