What kind of mutation occurs when one base is changed to another at a single location in the DNA?
A) Insertion B) Neutral C) Deletion D) Substitution
D
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The mother of these progeny resulted from a cross between two flies from true-breeding lines. What are the genotypes of these two lines?
In Drosophila, the autosomal recessive pr and cn mutations cause brown and bright-red eyes, respectively (wild-type flies have brick-red eyes). Flies who are homozygous recessive at both pr and cn have orange eyes. A female who has wild-type eyes is crossed to an orange-eyed male. Their progeny have the following distribution of eye colors:
A) pr cn+ / pr cn+ and pr+cn / pr+cn
B) pr+cn+ / pr+cn+ and pr cn / pr cn
C) pr+cn+ / pr cn and pr cn / pr cn
D) pr+cn / pr cn and pr cn+ / pr cn
E) More than one of these could be true.
The technique that separates denatured proteins based on size is
A) SDS-PAGE. B) FRAP. C) thin-layer chromatography. D) Western blotting. E) freeze-fracture microscopy.
Evidence shows that very dissimilar organisms, such as yeasts and humans, have some genes in common, indicating that they share a common ___
Fill in the blank(s) with the appropriate word(s).
Below is the structure of octane, the major component of gasoline. What type(s) of bond(s) is(are) found in a molecule of octane?
A) only nonpolar covalent bonds
B) only polar covalent bonds
C) hydrogen bonds and polar covalent bonds
D) ionic bonds and nonpolar covalent bonds