The nucleus of a cell
A) it contains large proteins that form chromosomes and are the genetic material for the cell.
B) is completely enclosed with no way in or out.
C) is surrounded by a double membrane.
D) contains only the DNA.
E) has all of the above attributes.
C) is surrounded by a double membrane.
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Niacin can be synthesized in human cells from the essential amino acid ________.
Fill in the blank(s) with the appropriate word(s).
Anabolism is the same as catabolism
Indicate whether the statement is true or false
Osseous tissue is a(an) ________ tissue
A) connective B) dense irregular C) dense regular D) epithelial E) reticular
Nonsteroid hormones ________ pass across the plasma membrane; they cause the target cells to ________ that produce the characteristic effects of the hormones.
A. can; synthesize specific proteins B. cannot; activate or inactivate the cellular enzymes C. can; activate or inactivate the cellular enzymes D. cannot; synthesize specific proteins