All of the following are epigenetic mechanisms, EXCEPT ________
A) changing gene expression by adding and removing methyl groups to DNA
B) changing gene expression by the use of small noncoding RNAs
C) changing gene expression by the use of long noncoding RNAs
D) changing gene expression by changing the nucleotide sequence through mutation
E) changing gene expression by adding and removing chemical groups to histone proteins
Answer: D
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Where do cold ocean currents generally occur?
a. along the west coast of continents b. near the poles c. near the equator d. along the east coast of continents e. in the open ocean
Triglycerides contain:
a. fatty acids only b. phosphate only c. glycerol only d. fatty acids and phosphate e. glycerol and fatty acids
A peptidoglycan-like polymer found in the cell walls of some Archaea is called ________.
Fill in the blank(s) with the appropriate word(s).
Autosomal monosomy is not seen in live births because:a
its effects are so small as to be overlooked. b. its effects do not set in until adulthood. c. its effects are so lethal as to cause spontaneous abortion early in pregnancy. d. it only occurs in sex chromosomes and therefore does affect nonreproductive function. e. the births lead to the establishment of a clone of abnormal cells