Which of the following structures is exclusively associated with prokaryotic cells?
A) membrane-bound nucleus
B) nucleoid
C) chromosome
D) ribosomes
Answer: B
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In cells of human individuals with three or more X chromosomes
a. one X chromosome remains active and the rest are inactivated. b. all of the X chromosomes remain active. c. two X chromosomes remain active, and any more are inactivated. d. two X chromosomes remain active in females and one remains active in males; the rest are inactivated. e. only one X chromosome is inactivated.
When a person has a liver ailment, bile pigments may leak into the blood causing
What will be an ideal response?
Why do harmful agents cause the most severe birth defects during the embryonic period?
A) The mother's hormones are at the highest levels at this time. B) The embryo has not yet implanted into the uterus. C) This is the period when substances pass most easily through the placenta. D) This is a period of rapid differentiation when cells and tissues acquire specific functions and organs form.
Compare and contrast antitermination and the use of an alternative sigma factor for regulating gene expression in the lytic cascade
What will be an ideal response?