The endoplasmic reticulum
A. functions in internal transport of macromolecules.
B. carries on cellular respiration.
C. is the site of photosynthesis.
D. is dispersed nuclear material of DNA and protein.
A. functions in internal transport of macromolecules.
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Which of the following is a source of carbon skeletons that are used in the synthesis of amino acids?
A. Acetyl-CoA B. Glycolysis intermediates C. TCA cycle intermediates D. All of the choices are correct.
Which two ions are the most abundant in plasma?
a. HCO3 ? and Ca2+ b. HCO3 ? and Cl? c. Na+ and Ca2+ d. Na+ and Cl? e. Na+ and K+
The unique feature of HeLa cells that make them
important for research is that a. they are identical to all other human cells. b. they are immortal cells and will grow in culture. c. they are limited in growth cycles. d. they are like stem cells. e. all of these make them important.
The intervertebral disks are classified as ____
a. synovial joints b. fibrous joints c. membranous joints d. cartilaginous joints e. hinge joints