Which organic molecule is composed of an amino group, a carboxylic acid group, and an R group?
A. carbohydrate
B. phospholipid
C. amino acid
D. nucleotide
Ans: C. amino acid
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Regulatory transcription factors _____
A) influence the binding of sigma factor to DNA B) influence the assembly of the basal transcription complex C) influence the degree of unwinding of DNA at the promoter D) open the two strands of DNA so that RNA polymerase can begin transcription
There are _____ microbial cells living on and in our bodies compared to the number of our body cells
a. ten times more b. ten times less c. about the same number of d. about half as many e. 100 times more
The relationship between Trichonympha protozoa and its termite host, and Xenorhabdus bacteria and its nematode host, are both obligatory relationships.
Answer the following statement true (T) or false (F)
Which of the following is NOT a requirement of natural selection?
A) differential reproductive success B) overproduction of offspring C) genetic variation D) gene flow