In bacteria and eukaryotes, a mutation is when ________
A) the expression of a gene changes without the DNA sequence being changed
B) the nucleotide sequence in an mRNA molecule is directly changed
C) the amino acid sequence in a protein molecule is directly changed
D) DNA is unable to be replicated
E) the nucleotide sequence in a DNA molecule is directly changed
Answer: E
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A. for several thousand years. B. since the Middle Ages. C. since the late 1800s. D. since the 1950s.
The structure that focuses light images on
photoreceptors is indicated by a. A. b. B. c. C. d. D. e. E.
In which cells would you expect to find the highest level of telomerase?
A. adipose tissue cells B. muscle cells C. cells that replenish the lining of the gut D. neurons
Almost all plants are ____________ because the only nutrients they require are water and minerals from the soil and carbon dioxide from the air.
Fill in the blank(s) with the appropriate word(s).