The purpose of the ocular lens is to
A) improve resolution.
B) magnify the image from the objective lens.
C) decrease the refractive index.
D) increase the light.
E) decrease the light.
B
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Cells in the G0 stage
A) have two chromatids per chromosome. B) are replicating their chromosomes. C) are about to enter the mitotic phase of the cell cycle. D) are in an extended G1 phase and no longer dividing. E) are dead.
You are genetic counselor, and a couple comes to you with concerns that if they have a child together
it could have cystic fibrosis. Genetic tests reveal that the woman is a carrier for cystic fibrosis but the man is not. Which of the following would be a correct thing to tell them?
a. Any child that they produce has a 50% chance of having cystic fibrosis, and the rest will be carriers. b. All of their offspring will have cystic fibrosis. c. They should not have any concerns, as no child that they produce should wind up with cystic fibrosis. d. No child that they produce should wind up with cystic fibrosis, but each of their offspring will have a 50% chance of being a carrier. e. Any child that they produce will have a 25% chance of having cystic fibrosis.
_____ was probably not present in the Earth's early atmosphere.
A. H2O B. NH3 C. O2 D. CO2
When mitosis occurs without cytokinesis, which of the following is produced?
A) merozoites B) chromatids C) cysts D) macronuclei E) coenocytes