Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

Match the following column I with column II.

Column I Column II
A. Carcinogen 1. Cancerous Tumour
B. Anaphase -I 2. Disjunction
C. Mitosis 3. Synapse
D. Zygotene 4. Plectonemic Coiling

  • A-1, B-2, C-4, D-3

  • A-3, B-1, C-4, D-2

  • A-2, B-3, C-1, D-4

  • A-4, B-1, C-3, D-2


A.

A-1, B-2, C-4, D-3

Carcinogen causes cancerous tumour disjunction of chromosomes takes place in anaphase I and II when chromosomes move to the opposite poles of the cell.

Plectonemic coiling refers to inter-twining of a double helix DNA molecule in such a way that for its correction unwinding of DNA helix molecule is required, this take place in mitosis in which sister chromatids are tightly coiled upon each other. In the zygotene stage, homologs login to synapse by coming to approximate alignment.


52.

Match the following Column I with Column II.

Column I Column II
A. Complementrary Ratio  1. 9:7
B. Supplementary Ratio 2. 9:3:4
C. Epistatic Ratio 3. 12:3:1
D. Inhibitory Ratio 4. 13:3

  • A-4, B-1, C-3, D-2

  • A-1, B-2, C-3, D-4

  • A-4, B-1, C-2, D-3

  • A-1, B-3, C-2, D-4


B.

A-1, B-2, C-3, D-4

Epistasis is an interaction between two or more genes to control a single phenotype. Dominant epistasis also called masking has a ratio 12:3:1 in the F2 phenotype supplementary genes which is recessive epistasis has ratio 9:3:4

Complementary gene where both dominant alleles are needed for phenotype has ratio 9:7. Inhibitor gene where one gene inhibits is an expression of another gene has ratio 13:3 in F2 progeny.


53.

Which of the following is true regarding the phase lambda, a virus which infects bacteria?

  • In the lytic cycle, the bacterial host replicates viral DNA, passing it on to daughter cells during binary fission

  • In the lysogenic cycle, the bacteria-host replicates viral DNA, passing it onto daughter cells during binary fission

  • In the lytic cycle, viral DNA is integrated into the host genome

  • In the lysogenic cycle, the host bacterial cell burst, releasing phases


B.

In the lysogenic cycle, the bacteria-host replicates viral DNA, passing it onto daughter cells during binary fission

In the lysogenic cycle, the bacterial host replicates phage lambda viral DNA, passing it onto daughter cells the during binary fission.


54.

The part of the bacterial chromosomes sharing homology with genome fragment transferred from the recipients to cell during emrozygote formation is known as

  • Eugenic

  • Exogenate

  • Endogenate

  • Dysgenic


C.

Endogenate

ENdogenate is the native DNA of the recipient bacterial cell which shares homology with the DNA Fragment inserted into it.

Exogenate is the DNA fragment that has been transferred into a recipient cell.

Eugenic is the study or practice of attempting to improve the human gene pool by encouraging reproduction among people with desirable traits. Dysgenics is the study of factors causing propagation of undesirable or disadvantageous genes and traits.


55.

The protein products of tumour suppressor gene may

  • Be present in non-cancerous cells

  • Cause signal cell death

  • Regulate the cell cycle

  • All of the above


A.

Be present in non-cancerous cells

A tumour suppressor gene or anti-oncogene, is a gene that protects a cell from one step on the path to cancer. It regulates the cell cycle, causes signal cell death and present is a non-cancerous cell.


56.

Which of the following statements is false regarding SDS-polyacrylamide gel electrophoresis?

  • Proteins are separated by molecular weight

  • SDS is a detergent which gives charge to protein

  • Large protein move more slowly through gel

  • SDS is used to maintain the 3-dimensional structure of protein


D.

SDS is used to maintain the 3-dimensional structure of protein

For protein, SDS (sodium DOdecyl Sulphate) is an anionic detergent applied to protein sample linearize proteins and to impart a negative charge to linearized proteins.


57.

In peal plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants could you expect in F1-generation

  • 9 : 1

  • 1 : 3

  • 3 : 1

  • 50 : 50


D.

50 : 50

Yellow seeds are dominant is green (Y), os, a heterozygous yellow seeded plant will have a genotype of (Y,y). when these plants are crossed, the F1 generation will have the ratio of yellow; green as 50:50.


58.

The one advantage of cleistogamy is

  • It leads to greater genetic diversity

  • Seed dispersal is more efficient and wide spread

  • seed set is not dependent on pollinators

  • Each visit of pollinator results in the transfer of hundreds of pollen grains


C.

seed set is not dependent on pollinators

Cleistogamous flowers do not open so, they self-pollinate and thus, do not depend on pollinators.


59.

In 1944, Avery, McCarty and MacLeod isolated substance from heat killed a virulent form of bacteria and added to the non-virulent form of bacteria which changed the non-virulent to virulent from this substance can be destroyed by

  • DNAse

  • Protease

  • Lipase

  • Amylase


A.

DNAse

Avery, MacLeod and McCarty carried out an experiment from which they reported that DNA is a substance that causes bacterial transformation from non-virulent to virulent bacteria, but DNAase acts as a waste management endonucleases responsible for DNA fragmentation.


60.

In a mutational event, when adenine is replaced by guanine, it is a case of

  • Frameshift mutation

  • Transcription

  • Transition

  • Transversion


C.

Transition

Transition is substitution gene mutation in which a purine (adenine) is replaced by another purine (guanine) or a pyrimidine (thymine) is replaced by another pyrimidine cvytosine). Change of codon ATC to GTC or ATT or ACC is an example of transition.

Transversion in substitution gene mutation in which a purine (A or G) is replaced by a pyrimidine (T or C) or vice versa.