In humans, the number of sperm cells required to produce a pair of identical twins is
A. 1
B. 2
C. 3
D. 4
Answer: A. 1
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The difference between living and nonliving matter depends not only on the kinds of atoms and molecules present, but
on their ____ as well.
a. chemical complexity b. electrons c. organization and interactions d. atomic profile e. energy levels
In which phase of the cell cycle does eukaryotic DNA replication take place?
a. M phase b. G0 c. S phase d. R phase
Which of the following would you expect to find predominating in the plasma membrane of a unicellular eukaryotic organism thriving in glacier ice?
A) 20 carbon long saturated fatty acids. B) 18 carbon long saturated fatty acids. C) 20 carbon long fatty acids with 1 double bond. D) 18 carbon long fatty acids with 1 double bond. E) 16 carbon long fatty acids with 3 double bonds
Lymphocytes
A) Gain tolerance to self by destruction of lymphocytes that could react against self. B) Possess MHC antigens for recognizing self. C) Develop into clones of B and T-cells with extreme variations of specificity. D) Have membrane receptors that recognize foreign antigens. E) All of these choices are correct