Question

QUESTION 38

1. Viral capsules are studded with

   		a. RNA polymerases
   		b. Reverse transcriptase
   		c. Proteins which bind to host cell surface proteins
   		d. Double-stranded DNA

2 points   

QUESTION 39

1. The scientists who worked out the structure of DNA and received the Nobel Prize for this discovery are:

   		a. Darwin and Newton
   		b. Hershey and Chase
   		c. Morgan, Griffith and Avery
   		d. Watson, Crick and Wilkins

2 points   

QUESTION 40

1. The two strands of the DNA double helix are attached to one another by:

   		a. Covalent bonds
   		b. Protein scaffolding
   		c. Helicase
   		d. Hydrogen bonds

2 points   

QUESTION 41

1. Which is a description of “RNA processing” in Eukaryotes?

   		a. 5’ cap, Poly-A tail, removal of introns
   		b. mRNA leaves the nucleus and attaches to a ribosome
   		c. A complementary RNA copy is made of a gene sequence
   		d. RNAs that might be viruses are degraded in the cytoplasm

2 points   

QUESTION 42

1. The function of the tRNA is to:

   		a. Transcribe the DNA
   		b. Take the gene sequence from the nucleus to the cytoplasm
   		c. Bring the amino acids to the ribosome for translation
   		d. Supply the energy (GTP) for translation

2 points   

QUESTION 43

1. Cystic Fibrosis is a recessive genetic disease which is often fatal in childhood even with excellent medical treatment. Nevertheless, the cystic fibrosis allele is very common in areas of Europe that used to experience epidemics of cholera and typhoid on a regular basis, and seems to offer protection to carriers. This common occurrence of the CF allele is an example of:

   		a. Genetic dominance
   		b. Co-dominant alleles
   		c. A,B,O blood groups
   		d. Heterozygote advantage

2 points   

QUESTION 44

1. All viruses have:

   		a. A DNA core
   		b. Ribosomes
   		c. A protein capsid
   		d. A membranous envelope

2 points   

QUESTION 45

1. Duchenne muscular dystrophy (DMD) is caused by a recessive allele on the human X chromosome. The patients have muscles that weaken over time because they have absent or decreased dystrophin, a muscle protein. They rarely live past their 20s and do not father children. How likely is it for a woman to have this condition?

   		a. If the mother is a carrier, ¼ of her daughters will have it.
   		b. ½ of the daughters of an affected man could have this condition.
   		c. ¼ of the children of an affected father and a carrier mother could have this condition.
   		d. Very rarely would a woman have this condition; since she would have to have an affected father

2 points   

QUESTION 46

1. Which of the following is an example of polygenic inheritance?

   		a. the ABO blood groups in humans
   		b. Huntington's disease in humans
   		c. white and purple flower color in peas
   		d. adult height in humans

2 points   

QUESTION 47

1. Individuals with 3 copies of chromosome 21 have Down Syndrome. These individuals are correctly described as:

   		a. Triploid
   		b. Monosomic
   		c. Haploid
   		d. Aneuploid

2 points   

QUESTION 48

1. When an mRNA is made into protein, this process is called:

   		a. Translation
   		b. Transcription
   		c. Transposition
   		d. Teleportation

2 points   

QUESTION 49

1. Hemophilia A is a recessive sex-linked disorder characterized by the inability to form normal blood clots. Without medical treatment, this disease is fatal. The "H" is for normal clotting factor VIII, the "h" is the hemophilia allele for abnormal clotting factor. This Punnett square is from a family with the allele for Hemophilia A. What percentage of this couple's sons will suffer from hemophilia?

   		a. 0%
   		b. 25%
   		c. 50%
   		d. 100%

2 points   

QUESTION 50

1. Recessive alleles show in the phenotype:

   		a. In a heterozygous condition
   		b. In a homozygous condition
   		c. Recessive genes never show in the phenotype
   		d. Recessive genes always show in the phenotype

Answer 1

Ans-38.) Viral capsules are stubbed with Proteins that bind to host cell surface proteins (c).

Ans-39.)Watson, Crick and Wilkins (d) worked out the structure of DNA and shared novel prize.

Ans-40.)Two strands of DNA are attached to each other by Hydrogen bonding (d)

Ans-41.) RNA processing in eukaryotes involve 5'cap , 3' Poly A tail and introns removal (a).

Ans-42.) The function of tRNA is to bring amino acids to ribosomes for translation (c)

Ans-43.)This common occurrence of the CF allele is an example of Hetrozygote advantage (d)

Ans-44.) All viruses have a protein capsid (c)

Ans-45.) Very rarely would a woman have this condition; since she would have to have an affected father (d) .Women to be sufferer ,mother must be a carrier and father must be affected (which is rare, as affected survive hardly past 20s).

Ans-46.) Adult human height (d)  is an example of polygenic inheritance.

Ans-47.) Individuals with 3 copies of chromosome 21 have Down Syndrome. These individuals are correctly described as Aneuploid (d)

Ans-48.) When an mRNA is made into protein, this process is called Translation (a) .

Ans-49.) Punnet square is not provided with the question. So it is impossible to figure out the answer .

Ans-50.)Recessive alleles show in the phenotype in homozygous condition only (b).