Which of the following is a correct association?
A. cytokinesis - breaking of the centromeres
B. centromere - division of the cytoplasm
C. sister chromatids - two identical chromosome strands still attached at the centromere
D. mitosis - when a cell duplicates and then divides twice to reduce the chromosome number by half
E. haploid - two of each chromosome
Answer: C
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Antigen-presenting cells present antigens to
A) B lymphocytes. B) T lymphocytes. C) dendritic cells. D) neutrophils.
Which is/are true of coenzymes?
A. They are organic molecules. B. They transfer atoms from one molecule to another. C. They may bind to a number of different enzymes. D. They are synthesized from vitamins. E. All of the choices are correct.
Many of the organic molecules associated with life can be created spontaneously under certain conditions. What do these conditions resemble?
A) Earth's core B) Primordial Earth C) The sun D) A comet
Most of the oxygen in the body is transported _______.
a) by peristalsis b) as chyme c) bound to the protein hemoglobin d) as bicarbonate ions