Which of the following characteristics is not associated with platelets?
a) They contain granules with clotting factors and enzymes.
b) They are incapable of oxidative catabolism.
c) They are cell fragments.
d) They do not have a nucleus.
Answer: b) They are incapable of oxidative catabolism.
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In some proteins, an ionic bond may form between an amino acid with
A. a positive R group and an amino acid with a negative R group. ?B. a negative R group and a nonpolar amino acid. ?C. a sulfhydryl group and an amino acid with an amine group.?D. a carboxyl group and an amino acid with a C-terminal.?E. a glycine and another with a tryptophan.
Cell connections called ____________________ force materials to pass through cells and not between them
Fill in the blank(s) with correct word
Which of the following events occurs in the nucleus?
A. Production of phospholipids B. Ribosomal proteins formed C. ATP synthesis D. Chromatin condenses to form chromosomes E. None of the choices are correct.
A pacemaker that appears unexpectedly at an abnormal site in the heart muscle is called a(n) ________
A) Heart muscle cannot serve as a pacemaker. B) supplemental rhythmic center C) ectopic pacemaker D) extrasystole