Many genes encode proteins that are always needed by a cell, and therefore are always expressed. Such genes are

known as:
a. repressible.
b. promoter.
c. constitutive.
d. inducible.
e. operons.


c

Biology & Microbiology

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Mendel's monohybrid experiment results led to his law of __________.

Fill in the blank(s) with the appropriate word(s).

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Gentamicin, streptomycin, tetracycline, clindamycin, and erythromycin are _______.

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