MCQOPTIONS
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MCQOPTIONS
This section includes 302 Mcqs, each offering curated multiple-choice questions to sharpen your Biology knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
What is the maximum number of different amino acids in a polypeptide chain coded by the synthetic polyribonucleotides (UCAG)5? |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» D. Four | |
| 202. |
Which of the following enzyme(s) is/are required for lactose fermentation? |
| A. | Transacetylase |
| B. | β-galactosidase |
| C. | Galactoside permease |
| D. | All of these |
| Answer» E. | |
| 203. |
A level of regulation, demonstrated by the termination of transcription if tryptophan is abundant, by the tryptophan operon in E.coli cells is called |
| A. | activation |
| B. | attenuation |
| C. | corepression |
| D. | desiccation |
| Answer» C. corepression | |
| 204. |
The term used for plasmids possessing both RTF and r determinants is |
| A. | non self-transmissible plasmids |
| B. | non conjugative plasmids |
| C. | conjugative plasmids |
| D. | none of the above |
| Answer» D. none of the above | |
| 205. |
Which of the following is concerned with the management and analysis of biological data using computers? |
| A. | Bio-physics |
| B. | Bioinformatics |
| C. | Genomics |
| D. | Biomechanics |
| Answer» C. Genomics | |
| 206. |
What was the first eukaryotic chromosome to be sequenced? |
| A. | Yeast chromosome III |
| B. | Yeast chromosome XI |
| C. | Arabidopsis chromosome IV |
| D. | None of these |
| Answer» B. Yeast chromosome XI | |
| 207. |
The ribosome binding site |
| A. | forms a stem-loop structure in the RNA |
| B. | is located upstream of the promoter sequence |
| C. | is located immediately upstream of the start codon |
| D. | is more likely to be associated with an operon than with a gene encoding a single protein |
| Answer» D. is more likely to be associated with an operon than with a gene encoding a single protein | |
| 208. |
A microarray differs from a gene fusion in that, it |
| A. | carries DNA segments from many different genes |
| B. | is not constructed by cloning |
| C. | gives direct measurement of mRNA level |
| D. | all of the above |
| Answer» E. | |
| 209. |
Guanine always binds to |
| A. | cytosine |
| B. | guanine |
| C. | thymine |
| D. | none of these |
| Answer» B. guanine | |
| 210. |
Why the bacterium Treponema pallidum is difficult to culture? |
| A. | Because it requires a great deal of water to reproduce |
| B. | Because it is unable to use carbohydrates as an energy source |
| C. | Because it lacks the genes needed for TCA cycle and oxidative phosphorylation |
| D. | Because it requires extremely low temperature at which water freezes |
| Answer» D. Because it requires extremely low temperature at which water freezes | |
| 211. |
The species of bacteria, which possesses 250 genes for lipid biosynthesis is |
| A. | M. genitalium |
| B. | M. tuberculosis |
| C. | E. coli |
| D. | H. influenzae |
| Answer» C. E. coli | |
| 212. |
In the time since E. coli and Salmonella diverged evolutionarily |
| A. | there has been little change in either genome |
| B. | E. coli has acquired many genes via horizontal transfer |
| C. | E, coli has lost approximately 50% of its genome |
| D. | none of these |
| Answer» D. none of these | |
| 213. |
The physical nature of genomes is studied under |
| A. | structural genomics |
| B. | comparative genomics |
| C. | proteo genomics |
| D. | functional genomics |
| Answer» B. comparative genomics | |
| 214. |
Which of the following theory is supported by the genomic sequence of the obligate intracellular parasite Rickettsia prowazekii ? |
| A. | Parasitic bacteria have very large genomes |
| B. | Parasites have a definite genomic sequence similar to viruses |
| C. | Mitochondria have evolved from endosymbiotic bacteria |
| D. | All bacteria evolved from viruses |
| Answer» D. All bacteria evolved from viruses | |
| 215. |
Which one of the following represents a test cross? |
| A. | \[Ww\times WW\] |
| B. | \[Ww\times Ww\] |
| C. | \[Ww\times ww\] |
| D. | \[WW\times WW\] |
| Answer» D. \[WW\times WW\] | |
| 216. |
The number of autosomes in human female ovum is |
| A. | 11 |
| B. | 12 |
| C. | 22 |
| D. | 23 |
| Answer» D. 23 | |
| 217. |
In case of incomplete dominance the monohybrid ratio of phenotypes in \[{{F}_{2}}\] generation is |
| A. | 0.04306712962963 |
| B. | 0.12570601851852 |
| C. | 9 : 3 : 3 : 1 |
| D. | 2 : 3 : 1 |
| Answer» B. 0.12570601851852 | |
| 218. |
Who proved that DNA is basic genetic material? |
| A. | Griffith |
| B. | Watson |
| C. | Boveri and Sutton |
| D. | Hershey and Chase |
| Answer» E. | |
| 219. |
The factors which represent the contrasting pairs of characters are called |
| A. | dominant and recessive |
| B. | alleles |
| C. | homologous pairs |
| D. | determinants |
| Answer» C. homologous pairs | |
| 220. |
What was the most significant trend in evolution of modem man (Homo sapiens) from his ancestors? |
| A. | Upright posture |
| B. | Shortening of jaws |
| C. | Binocular vision |
| D. | Increasing brain capacity |
| Answer» E. | |
| 221. |
The primitive atmosphere of earth contained water vapours, hydrogen, ammonia and |
| A. | \[C{{O}_{2}}\] |
| B. | \[{{O}_{2}}\] |
| C. | \[{{N}_{2}}\] |
| D. | \[C{{H}_{4}}\] |
| Answer» E. | |
| 222. |
Which was absent in the atmosphere at the time of origin of life? |
| A. | \[N{{H}_{3}}\] |
| B. | \[{{H}_{2}}\] |
| C. | \[{{O}_{2}}\] |
| D. | \[C{{H}_{4}}\] |
| Answer» D. \[C{{H}_{4}}\] | |
| 223. |
Which one of the following genetic diseases is sex-linked? [IAS Prelim] |
| A. | Royal haemophilia |
| B. | Tay-Sachs disease |
| C. | Cystic fibrosis |
| D. | Hypertension |
| Answer» B. Tay-Sachs disease | |
| 224. |
Which one of the following is not a genetic disorder? [NDA] |
| A. | Colour blindness |
| B. | Down?s syndrome |
| C. | Haemophilia |
| D. | Xerophthalmia |
| Answer» E. | |
| 225. |
Which of the following is known as specific molecular scissors? |
| A. | Ligase |
| B. | Helicase |
| C. | Restriction endonuclease |
| D. | DNA polymerase |
| Answer» D. DNA polymerase | |
| 226. |
The bacteria generally used for genetic engineering is |
| A. | Agrobacterium |
| B. | Bacillus |
| C. | Pseudomonas |
| D. | Clostridium |
| Answer» B. Bacillus | |
| 227. |
First transgenic plant - |
| A. | Potato |
| B. | Tomato |
| C. | Tobacco |
| D. | Maize |
| Answer» D. Maize | |
| 228. |
From heredity point of view which marriage is not suitable |
| A. | Man Rh (-) and Woman Rh (+) |
| B. | Both Rh (+) |
| C. | Both Rh (-) |
| D. | Man Rh (+) and Woman Rh (-) |
| Answer» E. | |
| 229. |
State 'T' for True option and F for False option and choose the correct option at the endA. We have a single pair of sex chromosomes in all cells.B. Autosomes are 22 pairs of chromosomes.C. The human karyotype represents the pair of chromosome in a cellD.There are 46 Chromosomes as autosomes. |
| A. | TFTF |
| B. | TTTF |
| C. | TFFF |
| D. | TTFF |
| Answer» C. TFFF | |
| 230. |
The sex of the child in humans primarily depends on |
| A. | X chromosome of female part |
| B. | X and Y chromosome of male part |
| C. | Both [a] & [b] |
| D. | None of the two |
| Answer» C. Both [a] & [b] | |
| 231. |
Which one of the following is a dominant trait |
| A. | Albinism |
| B. | Sickle cell anaemia |
| C. | Phenylketonuria |
| D. | Polydactyly |
| Answer» E. | |
| 232. |
The number of chromosomes in Klinefelter?s syndrome is [CPMT 1995; MP PMT 2003; DPMT 2004] |
| A. | 47 (44 + XXY) |
| B. | 47 (44 + XXX) |
| C. | 47 (46 + 1 chromosome 21) |
| D. | None of these |
| Answer» C. 47 (46 + 1 chromosome 21) | |
| 233. |
A person who has 47 chromosomes due to an extra X chromosome is affected by [CPMT 1995; CBSE PMT 1996; MP PMT 2003] |
| A. | Turner's syndrome |
| B. | Klinefelter's syndrome |
| C. | Super female |
| D. | Down's syndrome |
| Answer» C. Super female | |
| 234. |
Which of the following is the main category of mutation [CBSE PMT 1999] |
| A. | Genetic mutation |
| B. | Zygotic mutaion |
| C. | Somatic mutaion |
| D. | All of these |
| Answer» E. | |
| 235. |
A man homozygous for brown colour marries a lady heterozygous for brown colour is dominant. What will be the fate of their children [BHU 1986] |
| A. | All brown |
| B. | Three brown |
| C. | Two brown |
| D. | None of the above |
| Answer» B. Three brown | |
| 236. |
Number of sex chromosomes is normal in [MP PMT 1992] |
| A. | Super female |
| B. | Turner's syndrome |
| C. | Klinefelter's syndrome |
| D. | Down's syndrome |
| Answer» E. | |
| 237. |
Which of the following is a genetic disease [CBSE PMT 1990; JIPMER 1993] |
| A. | Phenylketonuria |
| B. | Blindness |
| C. | Cataract |
| D. | Leprosy |
| Answer» B. Blindness | |
| 238. |
In man, albinism is due to non-synthesis of melanin in the absence of [BHU 2003] |
| A. | Lysine |
| B. | Tyrosinase |
| C. | Luciferase |
| D. | Melanase |
| Answer» C. Luciferase | |
| 239. |
Mutations are |
| A. | Changes which are not inherited |
| B. | Changes which are inherited |
| C. | Changes which may or may not be inherited |
| D. | Changes acquired by organisms during their life time |
| Answer» C. Changes which may or may not be inherited | |
| 240. |
Which one of the following pairs of terms/names mean one and the same thing [BHU 2003] |
| A. | Gene pool- Genome |
| B. | Codon - Gene |
| C. | Cistron -Triplet |
| D. | DNA fingerprinting-DNA profiling |
| Answer» E. | |
| 241. |
Restriction endonuclease, an enzyme used in Genetic Engineering is employed for[Kerala PMT 2004] |
| A. | Probing exons |
| B. | Cutting double stranded DNA |
| C. | Cutting single stranded DNA |
| D. | Join strands of DNA |
| E. | Copying DNA strands. |
| Answer» C. Cutting single stranded DNA | |
| 242. |
Which of these is widely used in genetic engineering [CPMT 2003] |
| A. | Anopheles |
| B. | Dragon fly |
| C. | Dragon lizard |
| D. | Fruit fly |
| Answer» E. | |
| 243. |
Nobel prize to Kornberg and Ochoa was given for [DPMT 1977, 86; BHU 1986; AMU 1989; RPMT 2002] |
| A. | Artificial synthesis of genes |
| B. | Chemistry of DNA and RNA |
| C. | ?One gene one enzyme' hypothesis |
| D. | Artificial synthesis of DNA |
| Answer» E. | |
| 244. |
A plant species threatened with extinction can be preserved in [CPMT 1996] |
| A. | Herbarium |
| B. | National Park |
| C. | Botanical Garden |
| D. | Gene Bank |
| Answer» D. Gene Bank | |
| 245. |
An orthodox seed is one which can [APMEE 1988] |
| A. | Tolerate dehydration and low temperature |
| B. | Tolerate low temperature but not dehydration |
| C. | Tolerate dehydration but not low temperature |
| D. | None of the above |
| Answer» B. Tolerate low temperature but not dehydration | |
| 246. |
Potato famine of Ireland was caused by the attack of fungus |
| A. | Phytophthora palmivora |
| B. | Plasmopara viticola |
| C. | Puccinia graminis |
| D. | Phytophthora infestans |
| Answer» E. | |
| 247. |
The three topmost major crops of the world in the order of total production are |
| A. | Wheat > Rice > Maize |
| B. | Rice > Wheat > Maize |
| C. | Wheat > Maize > Rice |
| D. | Rice > Maize >Wheat |
| Answer» D. Rice > Maize >Wheat | |
| 248. |
Wheat varieties collected by Vavilov were [MP PMT 1986] |
| A. | 26000 |
| B. | 2600 |
| C. | 4600 |
| D. | 260 |
| Answer» B. 2600 | |
| 249. |
In mRNA, AUG is the initiation codon and UAA, UAG and UGA are termination codons, therefore polypeptide cannot be synthesized beyond any of these triplets to the end of mRNA. Then which one of the following mRNA can be translated completely [AFMC 1993] |
| A. | AUG UUC UCC UGG UAA UAU |
| B. | AUG UUC UCC UGA UGG UAU |
| C. | AUC ACG UAU UUC UGA CUC |
| D. | AUG UAU UUC UGC CUC UAG |
| Answer» E. | |
| 250. |
Which of the following is the simplest amino acid [CBSE PMT 2005] |
| A. | Tyrosine |
| B. | Asparagine |
| C. | Glycine |
| D. | Alanine |
| Answer» D. Alanine | |