Sickle cell anemia is a recessive trait in humans. In a cross between a father who has sickle cell anemia and a mother who is heterozygous for the sickle cell allele, what is the probability that all of their first three children will be unaffected?
A) 1/4
B) 1/2
C) none
D) 1/8
E) 1/16
D) 1/8
Biology & Microbiology
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Free ________ molecules provide lubrication to joints between movable bones
Fill in the blank with correct word.
Biology & Microbiology
How many hydrogen bonds are present between cytosine and guanine (C and G)?
A) 1 B) 2 C) 3 D) 4
Biology & Microbiology
The flow of energy through living organisms is best characterized as ___.
A. circular B. increasing C. a lattice D. one way E. lossless
Biology & Microbiology
Which of the following is the best description of a virus?
A) A virus is a life-form that can reproduce inside cells or independently. B) A virus is a tiny spore-producing cell. C) A virus is a noncellular, replicating entity. D) A virus is the smallest living thing.
Biology & Microbiology