If the father is color blind, what is the genotype for his daughter? (Using the letter B for the normal allele)
What will be an ideal response?
X^B X^b
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How does the fetus obtain nutrients and oxygen?
A. Maternal and fetal veins are directly connected in the chorionic villi. B. Nutrients and oxygen diffuse into the umbilical capillaries from maternal blood pools that surround the chorionic villi. C. Maternal blood cells are carried across the fetal capillary walls through special pores. D. Maternal arteries and fetal veins are directly connected in the chorionic villi. E. Fetal and maternal blood pools around the chorionic villi to exchange gasses and nutrients. The blood is then returned to the umbilical vein.
_____ are always changed by participating in a reaction. (Choose all that are correct.)
a. Enzymes b. Cofactors c. Reactants d. Coenzymes
Which of the following is true about the enzyme telomerase?
A. It can re-establish telomere length. B. It is found only in adult cells. C. It is responsible for telomere shortening. D. It may speed up the aging process. E. It is expressed at low levels in cancer cells.
The phase during which embryonic cells arrange themselves into three layers is called:
A) organogenesis. B) fertilization. C) induction. D) cleavage. E) gastrulation.