Which of the following premises forms the basis of the concept of molecular evolution?
A) The molecules of life all evolved in the same approximate time span.
B) Species that have very similar DNA sequences probably share recent ancestors.
C) Species coevolved similar DNA sequences by chance.
D) All genes have the same mutation rate.
B) Species that have very similar DNA sequences probably share recent ancestors.
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Which of the following patterns of markers is a normal immune response after recovery from a hepatitis B viral (HBV) infection?
a. Negative hepatitis B surface antigen (HBsAg); negative hepatitis B core anti-body (anti-HBcAb); and negative hepatitis B surface antibody (anti-HBsAb) b. Positive HBsAg; negative anti-HBcAb; and negative anti-HBsAb c. Positive HBsAg; positive HBeAg (hepati-tis Be antigen); and negative anti-HBsAb d. Negative HBsAg; positive anti-HBcAb; and positive anti-HBsAb
Which one of the following statements about haplodiplontic life cycles is false?
A. For each gene, cells of the gametophyte stage have a single allele. B. Spore mother cells produce haploid spores by meiosis. C. The gametophyte stage produces gametes by mitosis. D. The zygote is the only diploid cell in the sporophyte stage. E. Mitosis occurs in both sporophyte and gametophyte stages.
When the human gene coding for insulin is introduced into a mouse embryo, the gene is correctly
expressed in the appropriate tissue. This shows that:a. tissue-specific gene expression is highly conserved during evolution. b. the introduced gene was edited by the mouse embryo for proper function. c. the introduced gene was exactly the same as the mouse gene for insulin. d. mice and humans are not closely related. e. mouse genes are not tissue specific.
________ cells have axons that can transmit nerve impulses in addition to being able to secrete hormones like endocrine cells
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