Among couples using a method of birth control consistently and correctly, the most important determinant of pregnancy risk is ______.
[A] their marital status
[B] their ethnic or racial group
[C] their income group
[D] their frequency of sex
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If the recombination frequency between gene A and B is 10 out of 100 offspring, gene A and C is 30 out of 100 offspring, and gene B and C is 40 out of 100 offspring, what is the location of these genes in relation to each other on a chromosome?
A. CAB B. BAC C. ABC D. CBA E. either CAB or BAC
In ______, eggs are fertilized inside the mother, and young are born alive.
a. viviparity b. ovipary c. ovoviparity d. oviparity
Which of the following is NOT a characteristic
of prions or prion diseases?
a. the protein that becomes a prion is common throughout the body b. they are misfolded proteins c. they form fibers that accumulate in the brain d. they result in tiny holes in the brain e. prion diseases are non-fatal
According to Oparin's theory for the origin of life, the prebiotic atmosphere:
A) already contained some primitive RNA molecules. B) basically was very similar to the atmosphere of today. C) contained many amino acids. D) had an abundance of methane, ammonia, and water. E) was rich in oxygen.