GGG and GGC are codons for the amino acid, glycine. A mutation caused the insertion of a cytosine in place of the guanine during DNA replication. Over many generations the DNA changes so that the frequency of GGC is similar to that of GGG. What is this phenomenon called? 
A. directional selection
B. stabilizing selection
C. neutral variation
D. adaptive variation
E. bottleneck effect
Answer: C
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A cell that cannot form spindle fibers cannot ____
a. engage in energy production b. exchange gases across the plasma membrane c. perform mitosis nor meiosis d. perform DNA replication e. engage in protein synthesis
Which of the following statements about RNA processing in eukaryotes is INCORRECT?
A. The excision of introns from pre-mRNA is the only modification required to produce a mature mRNA. B. A protein/RNA complex is used to remove introns from the pre-mRNA. C. A poly A tail is added on to the 3? end of the mRNA. D. A 7-methylguanosine cap is added on to the 5?end of the mRNA. E. Modification occurs in the nucleus.
Litter degrades into a dark brown or black homogeneous organic matter known as ________
Fill in the blank(s) with correct word
Foraging honeybees communicate the location of a source of food by
A) using a unique verbal language. B) flying around the location. C) creating noises with their wings. D) releasing pheromones. E) doing a specific waggle dance.