Subject

Biology

Class

NEET Class 12

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

 Multiple Choice QuestionsMultiple Choice Questions

51.

Paul berg's gene splicing experiment created the first rDNA molecule, which was a

  • T4 phage fragment incorporated into SV40 vector

  • Lambda phage fragment incorporated into SV40 vector

  • T4 phage fragment incorporated into pSC 101 vector

  • Lambda phage fragment incorporated into pSC 101 vector


B.

Lambda phage fragment incorporated into SV40 vector

Paul Berg's gene splicing experiment created the first rDNA molecule, which was a lambda phage fragment incorporated into SV40 vector.


52.

The sequence given below 5'-GGCC-3' is recognition sequence for which of the following enzyme

  • Not 1

  • Eco R1

  • Hae III

  • Puv I


C.

Hae III

Hae III is extracted from Haemophiles influenzae it cuts G-C in 5'-3' direction in both templates.


53.

Which of the following are not the functions of genes?

I. Cell division

II. Structure and metabolism control

III. Carrier of hereditary information

IV. Provide proof for crossing over

  • I, II, III and IV

  • I, III and IV

  • I, II and III

  • II, III and IV


C.

I, II and III

Gene fucntions are as follows:

(i) Genes are the units of inheritance

(ii) They control the morphology and physiology of individuals.

(iii) Their replication is essential for cell division.

(iv) Reshuffling of genes during sexual reproduction produces variations.


54.

Read the following statements.

I. Satellite DNA is found in the region of euchromatin

II. Prokaryotes contain only non-repetitive DNA

Identify wheather the given statements are true or false

  • Both the statements are true

  • I is true and II is false

  • I is false and II is true

  • Both the statements are false


C.

I is false and II is true

Satellite DNA is a part of eukaryotic DNA that differs in density from most of its DNA as determined by centrifugation, that consists of short repetitive nucleotide sequences. It is found in the region of heterochromatin. It is the region of chromosomes that are permanently coiled up tightly and inert.


55.

Cryptorchidism in males is

  • male sterility due to prostate

  • enlargement of prostate gland

  • inguinal hernea

  • hidden testis


D.

hidden testis

Cryptorchidism is a condition in which the testes do not descent into the scrotum. It is caused by deferent secretion of testosterone by foetal testis.


56.

Guillain Base syndrome is an autoimmune disease in humans. In this disease, antibodies are produced against.

  • TSH receptor on thyroid cells

  • Pancreatic beta cell antigen

  • Acetylcholine receptor of motor endplate

  • Myelin of peripheral nerves


D.

Myelin of peripheral nerves

The lack of immune response by lymphocytes to cells of the body is known as self-tolerance and appears to be due to the elimination of self-reactive lymphocytes by clonal deletion.

When self-toterance fails the body makes antibodies against its own components through T-cell activated B-lymphocytes. The body attack its own cells. leads to autoimmune diseases. Guillain Barre syndrome is acute inflammatory demyelina- ting polyneuropathy in which myelin of peripheral nerves is affected.


57.

Where does hyaline cartilage occur in an embryo?

  • Entire skeleton of the embryo

  • surface of bones at joints

  • pinna of the outer ear and in epiglottis

  • intervertebral discs of the spinal column


A.

Entire skeleton of the embryo

Cartilage tissue is firm but flexible, resists strain and is elastic. The common form of cartilage in mammals, known as hyaline cartilage forms the entire skeleton of the embryo.


58.

Which of the following is the best suited method for the production of virus free plants?

  • embryo culture

  • meristem culture

  • ovule culture

  • anther culture


B.

meristem culture

Meristem culture mainly involves culturing a
bud in culture medium under aseptic conditions.
The bud develops into shoot in the culture as the meristem already has the cell differentiated to give rise to different Tissues of shoot. It is best suited method for the production of virus-free plants.


59.

Consider the following statements given below.

I. First living form originated from semi-arid land.

II. Nucleic acid were the first sign of life and represented beginning of life.

III. It was strongly beleived that prokaryotes evolved to from eukaryotes.

Choose the correct option

  • I and II

  • II and III

  • Only III

  • I, II and III


C.

Only III

Out of all the three statements, only 3rd statement is correct.

First living form originated from primitive oceans. Nucleoproteins were the first sign of life and represented beginning of life.


60.

Given below is the survivorship curve of different population.

Which type of the curve has the highest chances of senescence affecting mortality?

  • Type I

  • Type I and II

  • Type III

  • Type I, II and III


A.

Type I

Curve I shows an almost ideal curve for a population in which senescence is the major factor affecting mortality. This curve would also be obtained for an annual crop plant such as wheat, where all the plants in a given field survive well early in life and then senescence simultaneously.

Curve II is an intermediate between curve I and III. In this, mortality rate is constant.

Curve III is lowest age and has a specific survival. It occurs early in life.