Two-thirds of the American population suffers from disorders determined by multiple genes and environmental factors
A. true
B. false
A
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All of the following are actin-dependent nonmuscle motility except
A) translocation of multienzyme complexes. B) pinching off of the cleavage furrow in cytokinesis. C) chemotaxis. D) cyclosis or cytoplasmic streaming. E) amoeboid movement.
How did Davis demonstrate that bacterial cells must be in physical contact in order for genetic exchange to occur?
A. He mixed together two bacteria strains with different nutritional requirements, and then added them to agar plates that lacked their required nutrients. B. When two bacterial strains with different nutritional requirements were combined in a tube and allowed to grow for several hours, they acquired the ability to grow without the addition of biotin. C. When two bacterial strains with different nutritional requirements were separated from each other by a selective filter, they did not acquire the ability to grow on agar plates that lacked their required nutrients. D. Only when enough pressure was applied to force bacteria from one side of a selective filter to another did they acquire the ability to grow without their required nutrients. E. Nutritional deficient strains only acquired the ability to grow without their required nutrients when the pore size of a selective filter was increased to allow bacteria to pass from one side to the other.
A boy developed signs of sexual maturity at age 3. A possible diagnosis is
A) XY female syndrome. B) XX male syndrome. C) congenital adrenal hyperplasia due to 21-hydroxylase deficiency. D) pseudohermaphroditism due to 5-alpha reductase deficiency.
Offspring receive both the alleles for a given trait from one parent.
Answer the following statement true (T) or false (F)