The central dogma of molecular biology states that information flows in one direction from
A.) nuclei to RNA to cytoplasm
B.) ribosomes to proteins to DNA
C.) genes to nuclei to ribosomes
D.) DNA to RNA to proteins
Ans: D.) DNA to RNA to proteins
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Explain how the cells produced by meiosis can have undergone two nuclear divisions but have a
haploid number of chromosomes. What will be an ideal response?
Assume that a new mutation occurs in the germ line of an individual. What finding would suggest that the new mutation is dominant rather than recessive?
What will be an ideal response?
In humans, free earlobes (E) are dominant to attached earlobes (e) and the presence of freckles (F) is dominant to the absence of freckles (f)
If an individual heterozygous for both of these traits were to mate with an individual with attached earlobes and no freckles, what is the probability of having a child with attached earlobes and freckles? A) 0% B) 25% C) 50% D) 100%
Rickettsia prowazekii is transmitted by
A) mites of the genus Leptotrombidium. B) the rat flea Xenopsylla cheopis. C) the human body louse Pediculus humanus. D) the dog tick Dermacentor. E) the cat flea Ctenocephalides felis.