Molecular Basis of Inheritance Test

Result

Molecular Basis of Inheritance Test - 54

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Which major concept of genetics was illustrated in the model designed by Watson and Crick?

A
DNA exhibits a double helix structure.

B
DNA was the molecule of heredity.

C
DNA copies itself through semiconservative replication.

D
Amino acids may have been the first biological molecules formed on Earth.

Solution

Watson and Crick proposed a double helical structure of DNA which was based upon the results of Wilkins that shows from x-ray crystallography the structure of DNA.
Watson and Crick proposed that the structure is made up of the backbone of sugar and phosphate and bases are present in a right angle to it. The structure arranges itself in the form of a double helical structure of DNA. The structure was based upon the results of the X-ray crystallography which showed the equal amount of distance between the helical structures.
So, the correct option is 'DNA exhibits a double helix structure'
Question 2
1 / -0

Which best describes the process of DNA replication?

A
Multiple "bubbles" form in the DNA that proceed with replication in both directions from the bubble.

B
A single "bubble" forms in the DNA that proceeds with replication in a single direction from the bubble.

C
DNA polymerase adds nucleotides to each separated strand of the DNA molecule at the replication fork replicating two leading strands at one end of the bubble and two lagging stands at the other side of the bubble.

D
Replication occurs at a single replication fork that replicates lagging and leading strands in the same direction.

Solution

DNA replication in eukaryotes is multi-replicon i.e., it has many origins of replication. So multiple bubbles are formed and then fuse which results in speeding up the replication of long DNA molecule. Inside the replication bubble, the Y-shaped replication fork is formed from where the replication process starts and proceeds bidirectionally. Thus, the correct answer is option A.
Question 3
1 / -0

Which of the following does not describe a correct function of DNA polymerase?

A
It helps to replace RNA primers with DNA nucleotides.

B
It adds complementary DNA base pairs in a 5 to 3 direction along the DNA leading and lagging strands.

C
It proofreads the replicated DNA and replaces mismatched DNA nucleotides.

D
It adds RNA nucleotides along the DNA template in transcription.

Solution

DNA polymerase is an enzyme used in the replication of DNA. It ads the DNA primers to the parent chain. This enzyme acts in the 5'-3 direction and thus forms lading stand on the chain that has 3'5' direction.
There are 3 DNA polymerases in use from which only the DNA polymerase II helps in replication and rest of the two are used in the DNA proofreading.

So, the correct option is 'It adds RNA nucleotides along the DNA template in transcription.'
Question 4
1 / -0

The genetic code of a segment of DNA reads $$3$$ TTCGGGTAGAAA $$5$$. A mutation occurs between the second and third base where an extra cytosine is added.
What would be the resulting amino acids that would be translated from the gene?

A
Lysine-Histidine-Arginine-Phenylalanine

B
Lysine-Alanine-Histidine-Leucine

C
Lysine- Arginine-Asparagine-Glutamic acid

D
Lysine-Alanine-Phenylalanine-Glutamic acid
Solution
Only 61 triplets or codons code for amino acids.
3 stop codons (aka nonsense codons or terminator codons) UUA UAG UGA.
The code is a degenerative code.
There is no punctuation between each codon.
The reading of mRNA is always in the same direction 5' to 3'
When reading from the chart, we find that the addition of extra cytosine will lead to a change in the amino acid sequence and the new sequence will be lysine-alanine-histidine and leucine.
So, the correct option is 'Lysine-Alanine-Histidine-Leucine'
Question 5
1 / -0

Lily has .......... more DNA than human genome.

A
10 times

B
4 times

C
20 times

D
18 times

Solution

The main aim of the Human Genome Project was to determine the sequence of 3.2 billion base pairs of Human Genome and to identify their functions.
It was found that Human Genome contains around 30,000 jeans and 99.9% of nucleotide bases and all human beings are same.
The amount of genes present in Lily is 18 times more than the Human Genome.

So, the correct option is '18times'.
Question 6
1 / -0

Which of the following is not an aim of human genome project?

A
To sequence the genome of selected model organism.

B
Eliminate all disease.

C
To sequence EST fragments of cDNA in both human and mice.

D
To develop computational tool for analysing sequence information.
Question 7
1 / -0

Which of the following is the largest gene in humans?

A
Dystrophin

B
Insulin

C
Titin

D
Phosphofructokinase

Solution

Dystrophin is a cytoplasmic rod-shaped protein consisting of which is chiefly situated in skeletal & cardiac muscles. Its formation includes the largest gene with 2.6 Mb and 97 exons.
So, the correct answer is 'Dystrophin'
Question 8
1 / -0

Which of the following can improve the diagnosis of many genetic disorder?

A
PCR

B
Human genome project

C
DNA fingerprinting

D
None of the above
Question 9
1 / -0

The human genome project is made up of .......... repetitive DNA sequences.

A
1%

B
5%

C
50%

D
90%
Solution
- The Human Genome Project was an international effort to determine the DNA sequence of the entire Human Genome and the mapping of genes that are present in humans.
- It is found that there are around 30000 to 40000 genes present in humans and 97% of the inactive DNA material contains around 50 percent of repetitive DNA material which makes around two-third of the sequence consisting of repetitive elements in humans.
So, the correct option is '50%'.
Question 10
1 / -0

All of the following statements about DNA replication are true except

A
DNA replication begins with an RNA primer.

B
Hydrogen bonds must be broken for replication to occur.

C
DNA replication begins at the promoter.

D
Bacterial DNA replication proceeds in a circular fashion.

E
One half of a new DNA strand must be assembled as small pieces instead of a continuous piece.

Solution

A. Initiation of DNA synthesis always requires a smaller segment of RNA called RNA primer. It is synthesized by enzyme primase.
B. The two strands of DNA double helix unwind with the help of DNA unwinding protein, called helicase. The unwinding occurs as this protein begins its binding with DNA strands, thus, breaking the hydrogen bonds between complementary nitrogenous bases.
C. DNA replication begins at certain fixed unique points and is called origin.
D. The chromosomes of bacteria are circular. Bacterial DNA replication occurs in a bidirectional way and proceeds with two replication forks in a circular manner.
E. Only one strand of DNA shows continuous replication which is called the leading strand. The other strand, called the lagging strand, replicates in a discontinuous manner by synthesizing short fragments called Okazaki fragments which are later joined by DNA ligase.
Hence, statement C is incorrect. So, the correct answer is 'DNA replication begins at the promoter'.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Molecular Basis of Inheritance Test - 54

Result

Molecular Basis of Inheritance Test - 54

Score

-

Rank

-

SHARING IS CARING

Question 1

DNA exhibits a double helix structure.

DNA was the molecule of heredity.

DNA copies itself through semiconservative replication.

Amino acids may have been the first biological molecules formed on Earth.

Solution

Question 2

Multiple "bubbles" form in the DNA that proceed with replication in both directions from the bubble.

A single "bubble" forms in the DNA that proceeds with replication in a single direction from the bubble.

DNA polymerase adds nucleotides to each separated strand of the DNA molecule at the replication fork replicating two leading strands at one end of the bubble and two lagging stands at the other side of the bubble.

Replication occurs at a single replication fork that replicates lagging and leading strands in the same direction.

Solution

Question 3

It helps to replace RNA primers with DNA nucleotides.

It adds complementary DNA base pairs in a 5 to 3 direction along the DNA leading and lagging strands.

It proofreads the replicated DNA and replaces mismatched DNA nucleotides.

It adds RNA nucleotides along the DNA template in transcription.

Solution

Question 4

Lysine-Histidine-Arginine-Phenylalanine

Lysine-Alanine-Histidine-Leucine

Lysine- Arginine-Asparagine-Glutamic acid

Lysine-Alanine-Phenylalanine-Glutamic acid

Solution

Question 5

10 times

4 times

20 times

18 times

Solution

Question 6

To sequence the genome of selected model organism.

Eliminate all disease.

To sequence EST fragments of cDNA in both human and mice.

To develop computational tool for analysing sequence information.

Question 7

Dystrophin

Insulin

Titin

Phosphofructokinase

Solution

Question 8

PCR

Human genome project

DNA fingerprinting

None of the above

Question 9

1%

5%

50%

90%

Solution

Question 10

DNA replication begins with an RNA primer.

Hydrogen bonds must be broken for replication to occur.

DNA replication begins at the promoter.

Bacterial DNA replication proceeds in a circular fashion.

One half of a new DNA strand must be assembled as small pieces instead of a continuous piece.

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.