NEET 2021 Biology Questions

Which one of the following organisms bears hollow and pneumatic long bones? NEET Year:

Which one of the following belongs to the family Muscidae? NEET Year:

Match the List - I with List - II. LIST I: A. Metamerism B. Canal system C. Comb plates D. Cnidoblasts LIST II: 1. Coelenterata 2. Ctenophora 3. Annelida 4. Porifera NEET Year:

Read the following statements: I. Metagenesis is observed in helminths. II. Echinoderms are triploblastic and coelomate. III. Roundworms have organ system level. IV. Water vascular system is characteristic of echinoderms. Choose the correct answer. NEET Year:

Match the following: A. Physalia, B. Limulus, C. Ancylostoma, D. Pinctada; 1. Pearl oyster, 2. Portuguese Man of War, 3. Living fossil, 4. Hookworm NEET Year:

Which stage of meiotic prophase shows terminalisation of chiasmata as its distinctive feature? []

Match List-I with List-II: List-I (a) S phase (b) G₂ phase (c) Quiescent stage (d) G₁ phase List-II (i) Proteins are synthesized (ii) Inactive phase (iii) Interval between mitosis and initiation of DNA replication (iv) DNA replication Choose the correct answer from the options given below: []

The fruit fly has 8 chromosomes (2n) in each cell. During interphase of mitosis, if the number of chromosomes at G₁ phase is 8, what would be the number of chromosomes after S phase? []

The centriole undergoes duplication during: []

Which of the following stages of meiosis involves division of centromere? []

Which one of the following conditions is NOT linked to deficiency of growth hormone? ()

Grave’s disease is caused due to: ()

Which hormone regulates reabsorption of water in kidney tubules? ()

Which one of the following hormones is a steroid? ()

The function of corpus luteum is to secrete: ()

The organelles that are included in the endomembrane system are:

Match List–I with List–II: List–I (a) Cristae (b) Thylakoids (c) Centromere (d) Cisternae List–II (i) Primary constriction in chromosome (ii) Disc-shaped sacs in Golgi apparatus (iii) Infoldings in mitochondria (iv) Flattened membranous sacs in stroma of plastids

When the centromere is situated in the middle of two equal arms of chromosomes, the chromosome is referred as:

Match List-I with List-II: () List-I (a) Protein (b) Unsaturated fatty acid (c) Nucleic acid (d) Polysaccharides List-II I. C=C double bonds II. Phosphodiester bonds III. Glycosidic bonds IV. Peptide bonds Choose the correct answer:

Which of the following are not secondary metabolites in plants? ()

Following are the statements with reference to 'lipids': () a) Lipids having only single bonds are called unsaturated fatty acids. b) Lecithin is a phospholipid. c) Trihydroxy propane is glycerol. d) Palmitic acid has 20 carbon atoms including carboxyl carbon. e) Arachidonic acid has 16 carbon atoms. Choose the correct answer:

What is the role of RNA polymerase III in transcription in eukaryotes? ()

Complete the flowchart on Central Dogma: ()

Statement I: Codon ‘AUG’ codes for methionine and phenylalanine. Statement II: ‘AAA’ and ‘AAG’ both code for lysine. ()

Which of the following about histones is wrong? ()

DNA fingerprinting involves identifying differences in specific DNA regions called: ()

The only enzyme in prokaryotic transcription that can catalyze initiation, elongation, and termination: ()

If Adenine makes 30% of DNA, what is % of Thymine, Guanine, and Cytosine? ()

Which of the following RNAs is not required for protein synthesis? ()

Identify the correct statement: ()

During the process of gene amplification using PCR, very high temperature is not maintained in the beginning, then which of the following step in PCR will be affected first? ()

During the purification process for recombinant DNA technology, addition of chilled ethanol precipitates out: ()

Plasmid pBR322 has a PstI restriction enzyme site within gene ampR that confers ampicillin resistance. If this enzyme is used for inserting a gene for β-galactosidase production and the recombinant plasmid is inserted in an E. coli strain: ()

Which of the following is a correct sequence of steps in a PCR (Polymerase Chain Reaction)? ()

A specific recognition sequence identified by endonucleases to make cuts at specific positions within the DNA is: ()

The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which during pollination brings genetically different types of pollen grains to stigma, is: ()

A typical angiosperm embryo sac at maturity is: ()

In some members of which of the following pairs of families, pollen grains retain their viability for months after release? ()

Diadelphous stamens are found in ()

The Adenosine deaminase deficiency results into: ()

For effective treatment of the disease, early diagnosis and understanding its pathophysiology is very important. Which of the following molecular diagnostic techniques is very useful for early detection? ()

Match List-I with List-II () . Choose the correct answer from the options given below.

Identify the incorrect pair ()