For a given pedigree of a certain trait, there is a family with 8 children (2 sons and 6 daughters). Neither of the sons in this family have the trait but all 6 daughters do. The mother does not show the trait or carry the trait but the father does. What is the most likely form of inheritance for this trait?
a) autosomal recessive
b) Y-linked
c) X-linked recessive
d) X-linked dominant
Ans: d) X-linked dominant
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gradient is a. simple diffusion. b. facilitated diffusion. c. osmosis. d. active transport. e. bulk flow.
Prior to the 19th century, most scholars thought that the world was less than 10,000 years old. Based on geological and radiometric evidence, however, scientists now believe the age of Planet Earth is closer to:
a) 20,000 years old. b) 100,000 years old. c) one million years old. d) 40 million years old. e) four billion years old.
In dissection, most nerve fibers appear gray to white because
A. the neuron is gray to white colored. B. sodium ions are part of the salt compound and they flow along the surface. C. nerve fibers are covered in a myelin sheath made of lipid or fat molecules. D. nerve fibers rapidly die and dead tissues soon become gray or white. E. nerve fibers consume large amounts of energy in the form of sugar.
Which of the following statements about natural killer cells is FALSE?
A) They destroy virus-infected cells. B) They destroy tumor cells. C) They destroy cells lacking MHC I. D) They are stimulated by an antigen. E) None of the answers are correct; all of these statements are true.