Why do chromosomes resemble the letter X when viewed during metaphase?
A) Because they all appear and function as X chromosomes at that stage.
B) Because there are two sister chromatids joined at a point in the middle (the centromere).
C) Because microtubules encircle and attach pairs of chromosomes to each other at the centromere.
D) Because each X-shaped structure is actually four chromosomes joined at the centromere.
B
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During conjugation, one gene (A) is found to transfer to the recipient bacteria 26 minutes following the start of conjugation, while a second gene (M) is found to transfer 37 minutes following the start of conjugation
A third gene (T) transfers 45 minutes following the start of conjugation. Based on this information, which of the following is true? A. Genes A and M have a genetic distance of 11 minutes B. Genes A and T have a genetic distance of 19 minutes C. Genes M and t have a genetic distance of 8 minutes D. The order of the genes is A M T E. All of the answers are correct
__________ can lead to the loss of genetic diversity. Fill in the blank(s) with the appropriate word(s)
At any temperature, the metabolic rates of endotherms are always higher than those of ectotherms of comparable size
1.True 2.False
What class of antibody functions through neutralization and agglutination of antigen, but cannot cross epithelial cells?
A) IgM B) IgE C) IgG D) IgD E) IgA