Which is the smallest portion of a substance that retains the properties of an element?
a. atom
b. compound
c. ion
d. molecule
e. mixture
A
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A point mutation that causes a premature stop codon is called a:
A. missense mutation. B. nonsense mutation. C. silent mutation. D. frameshift mutation.
The epithelial tissue of animal cells is most similar to the ________ of plant cells?
A. ground B. dermal C. xylem D. vascular E. phloem
Hexokinase is an enzyme that binds specifically to glucose and converts it into glucose 6-phosphate. The activity of hexokinase is suppressed by glucose 6-phosphate, which binds to hexokinase at a location that is distinct from the active site. This is an example of.
A. allosteric activation. B. cofactor binding. C. feedback inhibition. D. competitive inhibition.
The organelle that can collect, package, modify, and transport molecules is called the
A. vesicle. B. plasma membrane. C. Golgi apparatus. D. mitochondria.