The cell's metabolic reactions involve the participation of ________ that lower the activation energy needed for the initiation of a reaction.

A. coenzymes
B. enzymes
C. cofactors
D. ATP
E. vitamins


Answer: B

Biology & Microbiology

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Land plants, or embryophytes, evolved from

__________, a kind of green algae. Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

An animal such as a grasshopper can conserve water because it has an elaborately branching system of tubes within its body that it uses for gas exchange. These tubes are called

A) kidneys. B) flame cells. C) tracheae. D) gills. E) book lungs.

Biology & Microbiology

The neuron requires a certain level of depolarization of its membrane in order to generate an action potential. This level of depolarization is known as the ________

Fill in the blank(s) with correct word

Biology & Microbiology

Which of the following statements about meiosis is true?

(a) During meiosis, the paternal chromosomes pair with the maternal chromosomes before lining up at the metaphase plate. (b) Unicellular organisms that have a haploid state undergo meiosis instead of mitosis during cell division. (c) Meiosis produces four genetically identical cells. (d) In general, meiosis is faster than mitosis.

Biology & Microbiology