Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

41.

In genetic engineering, a DNA segment (gene) of interest, is transferred to the host cell through a vector. Consider the following four agents (A-D) in the regard and select the correct option about which one or more of these can be used as a vector/vectors

A) A bacterium
B) Plasmid
C) Plasmodium
D) Bacteriophage

  • A, B and D only

  • A only

  • A and C only

  • A and C only


D.

A and C only

Plasmids are the extrachromosomal DNA found in bacterial cells. These are commonly used as vectors in genetic engineering programmes because these have the capacity of binding with eukaryotic DNA. 
A bacteriophage is a virus that is parasitic within a bacterium. These also, are the important tools in genetic engineering as cloning vectors.

326 Views

42.

In human female, the blastocyst

  • forms placenta even before implantation

  • gets implanted into uterus three days after ovulation

  • gets nutrition from uterine endometrail secreation only after implantation

  • gets nutrition from uterine endometrail secreation only after implantation


D.

gets nutrition from uterine endometrail secreation only after implantation

Implantation is the attachment of blastocyst to the uterine wall (endometrium). It occurs after 6-7 days of fertilisation. during Implantation, the trophectoderm (trophoblast) comes in contact with the endometrium of the uterus and sinks into a pit formed in the endometrium and get completely buried in the endometrium. Trophoblast cells form specialised structures called villi, which help in absorption of nutrient materials.

483 Views

43.

Secretions from which one of the following are rich in fructose, calcium and some enzymes?

  • Male accessory glands

  • Liver

  • Pancreas

  • Pancreas


A.

Male accessory glands

Seminal Plasma is the fluid in which the sperms are bathed. It contains secretions from male accessory glands (ie, seminal vesicles, prostate gland, and bulbourethral glands).
Seminal fluid contains fructose, citrate, inositol, prostaglandins and several proteins. Prostate secretes a thin, milky fluid that contains calcium, citrate ions, phosphate ions, a clotting enzyme and a profibrinolysin.

489 Views

44.

Which one of the following techniques is safest for the detection of cancer?

  • Magnetic Resonance Imaging (MRI)

  • Radiography (X -ray)

  • Computed Tomography (CT)

  • Computed Tomography (CT)


A.

Magnetic Resonance Imaging (MRI)

Magnetic Resonance Imaging (MRI) is non -invasive technique, which uses strong magnetic field and provides information about chemistry, metabolic and biochemical data with a tissue without time-consuming chemical analysis. It is the safest technique for the detection of cancer since it does not utilise radiations and therefore, does not cause any side effect. 
The histopathological  study is not safe as it is invasive technique while radiography and computed Tomography (CT) use harmful X -rays.

764 Views

45.

Signal from fully developed foetus and placental ultimately lead to parturition which requires the release of 

  • oestrogen fro placenta

  • oxytocin from maternal pituitary

  • oxytocin from foetal pituitary

  • oxytocin from foetal pituitary


B.

oxytocin from maternal pituitary

The process of giving birth to a baby is called parturition. Parturition is induced by a complex neuroendocrine mechanism. The signals for parturition originate from the fully-developed foetus and t he placenta which requires the release of oxytocin from the posterior lobe of the maternal pituitary.

453 Views

46.

In eukaryotic cell transcription, RNA splicing and RNA capping take place inside the

  • ribosomes

  • nucleus

  • dictyosomes

  • dictyosomes


A.

ribosomes

Transcripiton involves the transfer of genetic information from DNA to functional mRNA. In eukaryotes, the modification of newly formed primary mRNA transcripts (pre- m-RNA) to produce functional mRNA is called RNA processing or post-transcriptional modification. it occurs in the nucleus and involves gene-splicing (i.e removal of introns from primary transcript and splicing together of exons) and capping involves the formation of a cap at 5' end by condensation of guanylate residues. The fully processes mRNA molecules are exported from the nucleus to the ribosomes for translation in the cytoplasm.

474 Views

47.

Which one of the following cannot be used for the preparation of vaccines against plague?

  • Formalin - inactivated suspensions of virulent bacteria

  • Avirulent live bacteria

  • Synthetic capsular polysaccharide material

  • Synthetic capsular polysaccharide material


C.

Synthetic capsular polysaccharide material

Synthetic capsular polysaccharide vaccines are available for the treatment of pneumonia and meningitis. Vaccines against plague are prepared from the suspensions of attenuated or heat-killed virulent bacteria or avirulent live bacteria.

749 Views

48.

A person suffering from a disease caused by Plasmodium experiences recurring chill and fever at the time when the

  • sporozoites released from RBCs are being rapidly killed and broken down inside spleen

  • trophozoites reach maximum growth and give out certain toxins

  • Parasite after its rapid multiplication inside RBCs ruptures them, releasing the stage to enter fresh RBCs

  • Parasite after its rapid multiplication inside RBCs ruptures them, releasing the stage to enter fresh RBCs


C.

Parasite after its rapid multiplication inside RBCs ruptures them, releasing the stage to enter fresh RBCs

In malaria, chill and fever are due to the release of a toxic substance haemozoin, formed by the breakdown of haemoglobin present in RBCs. It will be released after the rupture of RBCs in erythrocytic schizogony.

572 Views

49.

The Indian rhinoceros is a natural inhabitant of which one of the Indian states?

  • Uttarakhand

  • Uttar Pradesh

  • Himachal Pradesh

  • Himachal Pradesh


D.

Himachal Pradesh

Indian rhinoceros (Rhinoceros unicornis) is a natural inhabitant of Assam is India. It is now protected in Kaziranga National Park situated at sib sager in Jorhat district of Assam.

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50.

The fruit fly, Drosophila melanogaster was found to be very suitable for experimental verification of chromosomal theory of inheritance by Morgan and his colleagues because

  • It reproduces parthenogenetically

  • a single mating produces two young files

  • smaller female is easily recognisable from larger male

  • smaller female is easily recognisable from larger male


D.

smaller female is easily recognisable from larger male

The fruit fly, Drosophila melanogaster was found to be very suitable for experimental verification of chromosomal theory of inheritance by Morgan and his colleagues because

* It completes its life cycle in a very short period (ie, about two weeks).
* a single mating produces many offsprings.
* larger female is easily recognisable from the smaller male.

417 Views