1. Spliceosomes: a) are present in Bacteria b) are the size of an enzyme c) cont

Question

1. Spliceosomes:

a) are present in Bacteria

b) are the size of an enzyme

c) contain DNA and protein

d) all the above

2. The environment ____ influence expression of a genotype

a) cannot

b) can

3. DNA ligase:

a) adds nucelosides to a DNA strand

b) cuts DNA

c) forms a covalent bond in a sugar-phosphate backbone

d) adds supercoiling to DNA

e) catalyzes hydrogen bonding

4. Given the wobble hypothesis, if CCU codes for proline, UUC codes for phenylalanine, and CGU codes for leucine, then it is most likely that CCA codes for:

a) serine

b) threonine

c) leucine

d) phenylalanine

e) proline

5. When n equals ABC, AABBCCC is:

a) diploid

b) trisomic

c) monosomic

d) triploid

e) monoploid

6. How many Barr bodies are present in a 46, XY male?

a) 4

b) 3

c) 2

d) 1

e) none

In Drosophila, white eye is inherited as an X-linked recessive. Apterous wing is inherited as an autosomal recessive trait. A female heterozygous at both loci is crossed with a white-eyed male that is heterozygous for apterous wing.

7. Of all the offspring, what fraction will be female and white eyes?

a) 3/4

b) 1/2

c) 1/4

d) none

e) all the females will be white eyed

8. Of all the offspring, what fraction will be males and have normal red eyes and apterous wings?

a) 1/4

b) 1/2

c) 1/8

d) 1/16

e) 3/16

9. The recessive mutations curved wing and sepia eye are located on different autosomal chromosomes in Drosophila. A curved wing female is crossed to a sepia eye male to produce the F1. If an F1 female is then crossed to a curved wing, sepia male, what phenotypic ratio is then crossed to a curved wing, sepia male, what phenotypic ration will be expected in their offspring?

a) 1/4 wild: 1/4 sepia: 1/4 curved: 1/4 sepia, curved

b) 2/4 wild: 1/4 sepia: 1/4 curved

c) 9/16 wild: 3/16 sepia: 3/16 curved: 1/16 sepia, curved

d) 1/2 sepia: 1/2 curved

Explanation / Answer

Ans 1 : c) contain DNA and protein

The spliceosomes are only present in eukaryotic cells. These are large complex molecules which assemble on RNA polymerase II . They contain RNA and proteins. As much as 300 different proteins are known to be associated with these spliceosomes.

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