An insertion sequence is distinguishable from other mobile genetic elements because ________.
A. it encodes a transposase
B. it is composed of DNA
C. it is highly complex
D. it is smallest
Answer: D
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Organisms classified as Euglenozoa have previously been classified as protozoans, protista, plants, and animals. Why the confusion?
A) Like protozoans, they are unicellular. B) Like animals, many are heterotrophic. C) Like plants, many are photosynthetic. D) A and B only E) A, B, and C
For some human traits, two possible alleles exist. For other traits, multiple (more than two) alleles for the trait are present in the population. Which of the following is an example of a trait controlled by multiple alleles?
A) albinism B) blood type C) hemophilia D) color blindness
Mutations that improve the survival and reproduction of organisms, and thus contribute to the evolution of species, arise rapidly in prokaryotes due to their
A) cell wall composition. B) anaerobic metabolism. C) absence of a nucleus. D) rapid rate of cell division. E) sexual reproduction.
Mitogens are _____
(a) extracellular signals that stimulate cell division. (b) transcription factors important for cyclin production. (c) kinases that cause cells to grow in size. (d) produced by mitotic cells to keep nearby neighboring cells from dividing.