NEW: In cats, the gene for coat color is found on the X chromosome. Shown below is a mass of cells making up an early female cat embryo. The X chromosomes are shown in each cell; this embryo has one orange coat color allele (O) and one black coat color allele (B). Which of the following is ACCURATE about this embryo?
A. It will give rise to a calico cat.
B. It will give rise to a black cat, because black is dominant to orange.
C. It will give rise to an orange cat, as the paternal chromosomes carrying the black allele will be inactivated.
D. Since it is heterozygous, it will give rise to a cat with two Barr bodies in each cell.
E. Since it is heterozygous, it will give rise to a calico cat with two Barr bodies in each cell.
A. It will give rise to a calico cat.
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A patient has a staphylococcal infection of the blood; a septicemia - very serious and possibly deadly. As the doctor, you would like to prescribe a relatively non-toxic and inexpensive drug out of the cephalosporin family. However, if the patient harbors a strain of Staphylococcus that is resistant to a variety of antibiotics, you would prefer to use vancomycin-- which is highly effective against Staphylococcus. Which of the following explains why the cephalosporin drug is preferred for use over the vancomycin?
A. Vancomycin is very toxic, and the Staphylococcus strain could become resistant leaving no back-up drugs with which to treat the infection. B. You really do not know that much about vancomycin, so you would rather go with a drug that you can find out more about. C. You would rather give an inexpensive drug to save the family money. D. Vancomycin is one of the most selectively toxic drugs there is, so you would prefer one that has a more broad-spectrum effect.
Cri-du-chat syndrome results from a(n)
a. deletion. b. inversion. c. translocation. d. duplication. e. aneuploidy.
Name the structure in which proteins associate with DNA and pack it very tightly by organizing the molecules.
A. Histones B. Chromosomes C. Lysosomes D. Ribosomes E. Homologous lysosomes
Which of the following is true?
a. bacteria tumble more when moving towards an antibiotic b. bacteria runs when the flagella turns counter clockwise c. the proton motive force powers the flagells d. A and B e. All of the above