If the screening of the DNA constructs is carried out in pooled batches then it takes less time.

A coaching institute has students in 3 batches – X, Y and Z. In a certain examination, the average marks obtained by these batches are 72, 60 and 50 respectively. The average marks of batches X and Y taken together is 69. If the ratio of the number of students in batches Y and Z is 6 : 7. What is the average score of all the three batches put together?

A

59

B

61.6

C

63.5

D

64.7

E

65

The screening of libraries us carried out by nucleic acid hybridisation and constitutes of following steps: i) Peeling of membranes carrying away bacterial cells with it ii) Cells are lysed and denaturing of DNA is being carried out iii) Hybridization with labelled DNA iv) Placing the membrane onto plate containing recombinant cells Choose the correct sequence in which the steps are carried out (starting to ending).

A

iv)-i)-ii)-iii)

B

iv)-ii)-i)-iii)

C

i)-ii)-iii)-iv)

D

iii)-ii)-i)-iv)

Consider the following statements regarding DNA replication and choose the correct answer:
1. The very first requirement of DNA synthesis is the presence of a template or plan along which the new strand is to be constructed
2. The second requirement is of a DNA-dependent-DNA polymerase or simply DNA polymerase enzyme
3. A DNA Pol cannot join two free nucleotides; one of them must be anchored by hydrogen bonds to a DNA strand
4. Replication takes place bidirectionally

A

1, 2, 3 and 4 are true

B

Only 2 and 4 are true

C

Oniy 2, 3 and 4 are true

D

Only 1 and 2 are true

The following statement is If the overall flows in and out for over a time period for several batches are considered, and local batches ignore, the process can be treated as continuous.

A

False

B

True

C

Depends on the process

D

None of the mentioned

A class of first year B. Tech. students is composed of four batches A, B, C and D, each consisting of 30 students. It is found that the sessional marks of students in Engineering Drawing in batch Chave a mean of 6.6 and standard deviation of 2.3. The mean and standard deviation of the marks for the entire class are 5.5 and 4.2, respectively. It isdecided by the course instructor to normalize the marks of the students of all batches to have the same mean and standard deviation as that of the entire class. Due to this, the marks of a student in batch C are changed from 8.5 to

A

6.0

B

7.0

C

8.0

D

9.0

In a public bathroom there are n taps 1,2,3...n. Tap1 and Tap2 take equal time to fill the tank while Tap3 takes half the time taken by Tap2 and Tap4 takes half the time taken by Tap3. Similarly each next number of tap takes half the time taken by previous number of Tap i.e, K-th Tap takes half the time taken by (K-1)th Tap.If the 10th tap takes 2 hours to fill the tank alone then what is the ratio of efficiency of 8th tap and 12th tap, respectively?

A

4:1

B

5:3

C

16:1

D

1:16

Choose the correct statement if the screening is carried out by screening by expression in vivo.

A

The proportion of recombinants carrying gene of interest is small

B

The recombinants carrying gene of interest don’t complement the host mutation

C

Mutation should be affecting many genes

D

Most of the products selected would be result of complementation

Screening is often carried out for a sequence that interacts with a protein for which already a clone is present. It is carried out in which host?

A

Bacterial host

B

Fungal host

C

Parasitic host

D

Yeast host

Though the right border (RB) and left border (LB) of T-DNA are identical, the DNA transfer is specific for the DNA left of the RB (the T-DNA), rather than for the DNA left of the LB because

A

The sequence context at the RB defines the direction of transfer

B

The sequence context at the LB defines the direction of transfer

C

The nuclear location sequence (NLS) of VirD2 protein drives the excised T-strand

D

The endonuclease activity of VirD2 protein allows nicking at RB

Which of the following statements about DNA is/are correct?
1. DNA is the hereditary material of all living organisms.
2. All segments of DNA code for synthesis of proteins.
3. Nuclear DNA is double helical with two nucleotide chains which run anti-parallel.
4. DNA is also found in mitochondria.
Select the correct answer:

A

1, 2 and 3

B

3 and 4

C

1, 3 and 4

D

Only 4

If the screening of the DNA constructs is carried out in pooled batches then it takes less time.

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