What typically leads to cancers associated with mammalian insulin growth factor 2 (Igf2)?
a. duplication
b. translocation
c. X-inactivation
d. loss of imprinting
Ans: d. loss of imprinting
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Why do obligate symbionts often contain lower G+C content when compared to free-living organisms?
A) Ancestral symbionts had low GC content genomes by chance, and these low GC content genomes are passed onto their progeny. B) Free-living organisms must have a more stable genome to survive; low G+C content organisms are often selected against in nature. C) Replicating high G+C content genomes requires several additional enzymes, to break apart the strong triple bonds formed from GC pairs, which are rarely found in symbionts with relatively small genome sizes. D) Symbionts usually do not have as many DNA repair mechanisms as free-living organisms, and two common spontaneous mutations change GC pairs into AT pairs.
Given the following pedigree, what is the coefficient of inbreeding for individual IV-1?
A) 1/2 B) 1/4 C) 1/8 D) 1/16 E) 1/64
Familial hypercholesterolemia is characterized by _____
A) defective LDL receptors on the cell membranes B) poor attachment of the cholesterol to the extracellular matrix of cells C) a poorly formed lipid bilayer that cannot incorporate cholesterol into cell membranes D) inhibition of the cholesterol active transport system in red blood cells
In all cases, freezing kills microbes.
a. true b. false