Which of the following statements about sister chromatids is TRUE? rev:
A. Sister chromatids are produced during mitosis.
B. Sister chromatids are held together by complementary base pairing of DNA at the centromere.
C. Sister chromatids are exact copies of each other and are formed just prior to cell division.
D. After mitosis, sister chromatids contain the same genes, but they may have different alleles.
E. All of these statements about sister chromatids are TRUE.
C. Sister chromatids are exact copies of each other and are formed just prior to cell division.
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Celiac disease is an autoimmune disorder which destroys the microvilli of the small intestine. Vitamin B12 can be absorbed by passive diffusion across the microvilli of the small intestine. Consider a patient who has had 10% of their microvilli destroyed. If the concentration of vitamin B is 0.6 pg/ml inside the lumen of the small intestine and 0.3 pg/ml on the inside of an epithelial cell, how
is the diffusion rate of vitamin B altered in this patient? A. It is reduced by 10%. B. It is reduced by .003%. C. It is increased by 10%. D. It is reduced by .3%. E. It is increased by .3%.
The place on a stem where one or more leaves are attached is called the ____
a. terminal bud b. internode
c. axil d. lateral bud e. node
Different, or alternative, forms of the same gene are called
A) alleles. B) genetomorphs. C) chromatids. D) homologous. E) mutants.
A hypothetical mutation in a squirrel population produces organisms with eight legs rather than four. Further, these mutant squirrels survive, successfully invade new habitats, and eventually give rise to a new species. The initial event giving rise to extra legs would be a good example of
A) punctuated equilibrium. B) species selection. C) habitat selection. D) changes in homeotic genes. E) allometry.