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MCQOPTIONS
This section includes 14620 Mcqs, each offering curated multiple-choice questions to sharpen your NEET knowledge and support exam preparation. Choose a topic below to get started.
| 7501. |
Who was awarded Nobel prize for the synthesis of an artificial gene [Kerala PMT 2004] |
| A. | Hargovind Khorana |
| B. | M.S. Swaminathan |
| C. | B.P. Pal |
| D. | P. Maheshwari |
| Answer» B. M.S. Swaminathan | |
| 7502. |
Which is not true for Operon model |
| A. | Regulator gene |
| B. | Promotor gene |
| C. | Repressor gene |
| D. | Operator gene |
| Answer» D. Operator gene | |
| 7503. |
The possibility of three letter genetic code was pointed out by |
| A. | Khorana |
| B. | Gamow |
| C. | Holley |
| D. | Nirenberg |
| Answer» E. | |
| 7504. |
Khorana got the Nobel Prize on [CPMT 1995; Pb. PMT 1999] |
| A. | DNA synthesis |
| B. | Genetic code |
| C. | Protein synthesis |
| D. | Enzyme synthesis |
| Answer» C. Protein synthesis | |
| 7505. |
An inactive repressor produced by regulator gene that does not block the operator site in the tryptophan Operon is called |
| A. | Aporepressor |
| B. | Intron |
| C. | Exon |
| D. | Clone |
| Answer» B. Intron | |
| 7506. |
The genetic code necessary for building up its own amino acids during the multiplication of virus, is carried by |
| A. | The virus nucleic acid |
| B. | The virus protein |
| C. | The host protein |
| D. | The host nucleic acid |
| Answer» B. The virus protein | |
| 7507. |
The arrangement of three bases in the genetic code signifies a specific [MP PMT 1994] |
| A. | Protein |
| B. | Amino acid |
| C. | Plasmid |
| D. | Nucleic acid |
| Answer» C. Plasmid | |
| 7508. |
The genetic code is called a degenerate code because [JIPMER 1994] |
| A. | More than one codon has the same meaning |
| B. | 1 codon has many meaning |
| C. | 1 codon has one meaning |
| D. | There are 64 codons |
| Answer» B. 1 codon has many meaning | |
| 7509. |
Genetic codes are |
| A. | Similar in mtDNA, virusus, bacteria and eukaryotes |
| B. | Different in viruses and bacteria |
| C. | Different in mtDNA |
| D. | Different in mtDNA and bacteria |
| Answer» D. Different in mtDNA and bacteria | |
| 7510. |
What is meant by degenerate code |
| A. | One amino acid is coded by one code |
| B. | One amino acid can be coded by more than one code |
| C. | One code controls one code |
| D. | One code can control more than one amino acid |
| Answer» C. One code controls one code | |
| 7511. |
There are 64 types of codons in genetic code dictionary because [CBSE PMT 1990] |
| A. | There are 64 types of tRNA's found in cell |
| B. | There are 44 meaningless and 20 codons for amino acids |
| C. | There are 64 amino acids for coding |
| D. | Genetic code is triplet |
| Answer» E. | |
| 7512. |
The human sperms were first seen and discovered by |
| A. | Ernst Haeckel |
| B. | Hamm and Leeuwenhoek |
| C. | Louis Pasteur |
| D. | Robert Hooke |
| Answer» C. Louis Pasteur | |
| 7513. |
Survival time of sperms introduced into the vagina may be |
| A. | 1-2 days |
| B. | 3-4 days |
| C. | 5-10 days |
| D. | 1 week |
| Answer» B. 3-4 days | |
| 7514. |
Which of the following statements is incorrect. Human spermatozoa normally |
| A. | At a concentration of 1 million/ml of ejaculate will fertilize the ovum |
| B. | Are released in large numbers after a few days abstinence |
| C. | Contain enzyme in their head which helps in penetration of ovum |
| D. | Move with the help of their tails |
| Answer» B. Are released in large numbers after a few days abstinence | |
| 7515. |
The acrosome plays important role in [MP PMT 1999, 2000] |
| A. | Motility of sperm |
| B. | Penetration of ovum by sperm |
| C. | The fusion of pronuclei of the gametes |
| D. | None of these |
| Answer» C. The fusion of pronuclei of the gametes | |
| 7516. |
The breakage of the membrane surrounding the acrosome in a mammalian sperm is [MP PMT 1994] |
| A. | Activation |
| B. | Cavitation |
| C. | Agglutination |
| D. | Capacitation |
| Answer» E. | |
| 7517. |
Germ cells in mammalian gonads are produced by [CPMT 1992, 93; MP PMT 1997, 2000] |
| A. | Only mitosis |
| B. | Only meiosis |
| C. | Mitosis and meiosis both |
| D. | Without cell division |
| Answer» D. Without cell division | |
| 7518. |
Hormone responsible for metamorphosis in tadpole is [Manipal 2005] |
| A. | Adrenaline |
| B. | Thyroxine |
| C. | Aldasterone |
| D. | Vasopressin |
| Answer» C. Aldasterone | |
| 7519. |
Spermatogonia formed after which cell division [Haryana PMT 2005] |
| A. | Meiosis I |
| B. | Meiosis II |
| C. | Mitosis |
| D. | Amitosis |
| Answer» D. Amitosis | |
| 7520. |
What do you mean by the term spermateleosis [MH CET 2004; Manipal 2005] |
| A. | Conversion of spermatids to sperm |
| B. | Conversion of spermogohium to spermatid |
| C. | Conversion of spermatid to spermogonium |
| D. | Conversion of primary spermatocyte to secondary spermatocyte |
| Answer» B. Conversion of spermogohium to spermatid | |
| 7521. |
The process of releasing the ripe female gamete from the ovary is called [CPMT 1988] |
| A. | Parturition |
| B. | Ovulation |
| C. | Fertilization |
| D. | Implantation |
| Answer» C. Fertilization | |
| 7522. |
During embryonic development the establishment of polarity along anterior/posterior, dorsal/ventral or medial/lateral axis is called [CPMT 2005] |
| A. | Anamorphosis |
| B. | Organizer phenomena |
| C. | Pattern formation |
| D. | Axis formation |
| Answer» E. | |
| 7523. |
Sperms formed from 4 primary spermatocytes are [CPMT 2005] |
| A. | 4 |
| B. | 1 |
| C. | 16 |
| D. | 32 |
| Answer» B. 1 | |
| 7524. |
A cross section at the midpoint of the middle piece of a human sperm will show [AIIMS 2005] |
| A. | Centriole, mitochondria and 9+2 arrangement of microtubules |
| B. | Centriole and mitochondria |
| C. | Mitochondria and 9+2 arrangement of microtubules |
| D. | 9+2 arrangement of microtubules only |
| Answer» D. 9+2 arrangement of microtubules only | |
| 7525. |
Sperm?s acrosome has [Manipal 2005] |
| A. | Hyaluronic acid and proacrosine |
| B. | Hyaluronic acid and fertilizin |
| C. | Hyaluronidase and proacrosin |
| D. | Fertilizin and proacrosin |
| Answer» D. Fertilizin and proacrosin | |
| 7526. |
In mammalian sperm, spirally arranged mitochondria are present in [MHCET 2001] |
| A. | Head portion |
| B. | Middle piece |
| C. | End piece of the tail |
| D. | Principal piece of tail |
| Answer» C. End piece of the tail | |
| 7527. |
Nebenkern is a part of [KCET 2004] |
| A. | Foetus |
| B. | Graafian follicle |
| C. | Human ovum |
| D. | Human sperm |
| Answer» E. | |
| 7528. |
In frog chromosome no. is reduced to half [BHU 2003] |
| A. | When 2nd polar body is separated |
| B. | When 2nd polar body is divided |
| C. | When 3rd polar body is separated |
| D. | When 1st polar body is separated |
| Answer» E. | |
| 7529. |
Polar bodies are formed during |
| A. | Spermatogenesis |
| B. | Oogenesis |
| C. | Gametogenesis |
| D. | Spermateleosis |
| Answer» C. Gametogenesis | |
| 7530. |
Testis produce [DPMT 1992] |
| A. | Sperms |
| B. | Eggs |
| C. | Seeds |
| D. | Spores |
| Answer» B. Eggs | |
| 7531. |
Fungal spores produced asexually at the tips of hyphae are called [CPMT 1988; AFMC 1994, 2005] |
| A. | Sporangiophores |
| B. | Anthospores |
| C. | Conidia |
| D. | Meiospores |
| Answer» D. Meiospores | |
| 7532. |
Bekanae disease was due to [Wardha 2005] |
| A. | Fungi toxin |
| B. | Growth homones released by fungal infection |
| C. | Inadequate nutrients |
| D. | Change in photoperiods |
| Answer» C. Inadequate nutrients | |
| 7533. |
Zygospore is formed from [Wardha 2005] |
| A. | Gametangial copulation |
| B. | Gametic union |
| C. | Zygote |
| D. | Oogamy |
| Answer» B. Gametic union | |
| 7534. |
A group of fungi with septate mycelium in which sexual reproduction is either unknown or lacking are classified under [CPMT 1984; BHU 1991; Pb. PMT 2000; JIPMER 2002] |
| A. | Phycomycetes |
| B. | Deuteromycetes |
| C. | Ascomycetes |
| D. | Basidiomycetes |
| Answer» C. Ascomycetes | |
| 7535. |
Which is not true for fungi [AMU PMT 2005] |
| A. | They can be saprophytic |
| B. | They can be multicellular |
| C. | They can be photosynthetic |
| D. | They can be anaerobic |
| Answer» D. They can be anaerobic | |
| 7536. |
Claviceps purpurea grows as parasite [CPMT 2005] |
| A. | In human gut |
| B. | In sugar cane roots |
| C. | On pine needles |
| D. | On fruits of grasses |
| Answer» E. | |
| 7537. |
Saprobiotic and parasitic modes of nutrition are found in [CPMT 2005] |
| A. | Bacteria |
| B. | Viruses |
| C. | Fungi |
| D. | Both (a) and (c) |
| Answer» E. | |
| 7538. |
Which of the following is an edible 'Fungi' [BHU 2005] |
| A. | Mucor |
| B. | Penicillium |
| C. | Agaricus |
| D. | Rhizopus |
| Answer» D. Rhizopus | |
| 7539. |
Which is the causal organism of red rot in sugarcane [Orissa JEE 2005] |
| A. | Helminthosporium |
| B. | Colletotrichum |
| C. | Fusarium |
| D. | Pythium |
| Answer» C. Fusarium | |
| 7540. |
Chloromycetin is obtained from [MHCET 2004] |
| A. | Saccharomyces cerevisiae |
| B. | Streplomyces venezualae |
| C. | Streplomyces griseus |
| D. | Streptomyces erythraeus |
| Answer» C. Streplomyces griseus | |
| 7541. |
Ergot of fungus produces [MHCET 2004] |
| A. | Charas |
| B. | LSD |
| C. | Marijuana |
| D. | Ganja |
| Answer» C. Marijuana | |
| 7542. |
Which of the following fungi is found useful in the biological control of plant disease [CPMT 2004] |
| A. | Penicillium notatum |
| B. | Phytophthora parasitica |
| C. | Mucor mucido |
| D. | Trichoderma viridae |
| Answer» C. Mucor mucido | |
| 7543. |
Black rust of wheat is caused by [MHCET 2000; BVP 2004] |
| A. | Puccinia graminis |
| B. | Ustilago |
| C. | Pythium |
| D. | None of these |
| Answer» B. Ustilago | |
| 7544. |
Clamp connection is found in [Orissa JEE 2004] |
| A. | Basidiomycetes |
| B. | Ascomycetes |
| C. | Saccharomycetes |
| D. | Haplomycetes |
| Answer» B. Ascomycetes | |
| 7545. |
Which one is saprophytic in nutrition [CPMT 2001] |
| A. | Fungi |
| B. | Cyanobacteria |
| C. | Viruses |
| D. | All the above |
| Answer» B. Cyanobacteria | |
| 7546. |
The chemical produced by the host plant to protect themselves against fungal infection is [MHCET 2002; Pb. PMT 2004] |
| A. | Toxin |
| B. | Phytoalexin |
| C. | Phytotoxin |
| D. | Hormone |
| Answer» C. Phytotoxin | |
| 7547. |
Phytoalexins are secreted by plants in response to fungal reaction. These compounds are generally [DPMT 2003; BVP 2004] |
| A. | Proteins |
| B. | Glycoproteins |
| C. | Phenolic compounds |
| D. | Lipids |
| Answer» D. Lipids | |
| 7548. |
Parasexuality was Ist discovered in [DPMT 2003; BVP 2004] |
| A. | Bacteria |
| B. | Virus |
| C. | Fungi |
| D. | None of these |
| Answer» D. None of these | |
| 7549. |
Fungal flagellum originates from [Orissa JEE 2005] |
| A. | Dictyosome |
| B. | Kinetosome |
| C. | Glyoxisomes |
| D. | Oxysomes |
| Answer» C. Glyoxisomes | |
| 7550. |
Citric acid is produced by [BVP 2001] |
| A. | Aspergillus niger |
| B. | Candida |
| C. | Penicillium notatum |
| D. | Acetobacter xylanicum |
| Answer» B. Candida | |