Genetics Exam Two

A Sample of normal double-stranded DNA was found to have a guanine content of 18% What is the expected proportion of Adenine?

32%

In one strand of DNA the nucleotide sequence is 5’- ATGC-3’. The complementary sequence in the other strand must be

3’-TACG-5’

Wild cats F. Silbestris and common mice M.musculus are diploid. In wild cats 2n-38, while common mice 2n=40. Based on this information, we can conclude that wild cats have

Fewer DNA molecules then common mouse cells

In the purple penguine an allelic series occurs at the p locus on an autosome. All alleles affect the color of feathers: pd= dark purple, pm=medium purple and pl=light purple, lastly pvl- very pale purple. The order of dominance is pd>pm>pl>pvl. If pl/pvl female is crossed to a pd/pm males, the ratio of the phenotypes expected among the baby penguins would be

1 dark and 1 medium

In chickens the dominant allele Cr produces the creeper phenotype( having extremely short legs). However the creeper allele is lethal in the homozygous condition. if two Creepers are mated what proportion of the living progeny will be creepers

2/3

A 15;1 phenotypic ratio in a typical F2 data set would be consistent with ________ affecting a particular phenotype

alleles of two genes

Oswald Avery and Collegues strengthened scientific support that DNA was the transforming fator by replicating the Griffith experiment with some important differences in experimental design. They found that enzyme_______ was effective at destorying the transforming capacity of S strain biomolecules

DNase (DNA destruction)

Which statement best describes the arrangement of components in a DNA molecule?

Nucleotides are located toward the inside of the strands and the posphates toward the outside.

The replisome contains protein subunit responsible for unwinding the double helix to enable DNA replication. This subunit/enzyme is named.

Helicase

The complexity of the lagging strand replication is necessary because:

A polymerization occurs in the 5’ to 3’ direction, the lagging strand must be synthesized in consecutive small fragments.

When replication the end of a chromosome, the lagging strand cannot copy the last -10 nucleotides at the end iof the chromosomes. As a result chromosomes contain telomere sequences at their ends which are defined as?

Noncoding; repetitive sequences that can be copies independent of the replisome.

Which of the following is/are true TRUE from RNA compared to DNA

1) RNA has a ribisome sugar in its nucleotide rather then the deoxyribose

2)RNA usually single stranded and can makes more complex three-dimensional molecular shapes than double-stranded DNA

3) RNA contains bases A,G,C,U while DNA has A,G,C,T

4RNA can catalyze biological reactions byt DNA cannot

5) all of the Above (This is the right question)

If the DNA template is 5’ATGCATGC-3’ were transcribes to RNA, The RNA would read

3’-UACGUACG-5’

Which of the following mRNA codons would form a codon-anticodon base pairing interaction with the '3’-UAG-5’ tRNA anticodon

5’-AUC-3’

The -10 and -35 boxes found in bacterial gene promotes function to

Orient RNA polymerase at a genes transcription start sits

A Key characteristics of bacterial RNA that is not observed with eukaryotic RNAs is that

Transcription can occur in the same cellualr region as translation

Which of the following is/are not a roles of the 5’cap

the cap as a binding site for the ribisome and protects the RNA from degradation

We know that DNA and RNA both use a three nucleotide genetics code and 64 codons . knowing the minimum number of codons for the genetics code is 21 what codon size would be required if only three nucelotides were present in the genome

3 nucleotides per codon

Which would be an anticodon for the amino acid isleucine

UAA, UAG, UAU

The aminoacyl-tRNA sybthtase enzumes are responsible for

Adding amino acidsnto appropriate tRNAs (Charging the tRNA)

The A site, Psite, and E site each control________ (Inorder) during translation

binding incoming tRNAs (A), retention of the peptide chain during elongation (P)m exit of deacylated tRNAs (E)