How is alcohol classified?
A. stimulant
B. psychoactive
C. inhibitor
D. depressant
E. none of these
Answer: D
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Genomic imprinting is a result of ___________
A. Nucleosome location B. Histone activation C. DNA methylation D. Serine to leucine changes in the genetic code
Why are viroids resistant to nucleases?
A. Having a circular RNA "genome," they are resistant to the digestion of most exonucleases (that nibble/digest the free ends of RNA or DNA). B. Having a circular RNA "genome," with no protein shell, they are resistant to the protein-degrading activities of nucleases. C. Nucleases will only digest DNA, not RNA-so viroids are protected. D. Viroids have only been identified in plants. Plant nucleases cannot digest RNA.
Protection from injury, dehydration, and microbes is provided by the
a. immune system. b. skeletal system. c. integumentary system. d. endocrine system. e. lymphatic system.
What part of the sperm first contacts the egg plasma membrane?
A) the vitelline membrane B) the cortical granules C) the acrosomal membrane D) the actin proteins E) the fertilization membrane