#neet
- Which of the following is not an objective of Biofortification in crops ? Answer: 2. Improve resistance to diseases Biofortification breeds crops for higher nutritional quality: more protein, vitamins, minerals and... 1
- Veneral diseases can spread through :(a) Using sterile needles(b) Transfusion of blood from infected person(c) Infected mother to foetus(d) Kissing(e) InheritanceChoose the correct answer from the options given below. Answer: 3. (b) and (c) only Sexually transmitted diseases spread by sexual contact, sharing of infected needles, blood transfusion from an i... 1
- With regard to insulin choose correct options.(a) C-peptide is not present in mature insulin.(b) The insulin produced by rDNA technology has C-peptide.(c) The pro-insulin has C-peptide.(d) A-peptide and B-peptide of insulin are interconnected by disu… Answer: 3. (a), (c) and (d) only Pro-insulin has chains A, B and a connecting C-peptide. During maturation C-peptide is removed, leaving A a... 1
- The fruit fly has 8 chromosomes (2n) in each cell. During interphase of Mitosis if the number of chromosomes at G_1 phase is 8, what would be the number of chromosomes after S phase ? Answer: 1. 8 The chromosome number does not change in S phase; only DNA content doubles, because each chromosome gets two sister chromatids... 1
- Which is the "Only enzyme" that has "Capability" to catalyse Initiation, Elongation and Termination in the process of transcription in prokaryotes ? Answer: 2. DNA dependent RNA polymerase In prokaryotes a single DNA-dependent RNA polymerase catalyses initiation (with sigma factor), elong... 1
- In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased ? Answer: 3. 25% Both parents are heterozygous carriers (Hb ^A Hb ^S ). Cross: Hb ^A Hb ^S × Hb ^A Hb ^S gives 1 Hb ^A Hb ^A : 2 Hb ^A Hb ^S :... 1
- 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 ? Answer: 3. ELISA Technique ELISA detects antigens or antibodies and can reveal infection (e.g. HIV) before symptoms appear, so it is the tec... 1
- Which stage of meiotic prophase shows terminalisation of chiasmata as its distinctive feature ? Answer: 3. Diakinesis Terminalisation of chiasmata (chiasmata slide towards the ends of the bivalents) occurs in diakinesis, the last stage... 1
- Read the following statements.(a) Metagenesis is observed in Helminths.(b) Echinoderms are triploblastic and coelomate animals.(c) Round worms have organ-system level of body organization.(d) Comb plates present in ctenophores help in digestion.(e) W… Answer: 4. (b), (c) and (e) are correct Check each statement. (a) Metagenesis (alternation of generations) is seen in cnidarians, not helmin... 1
- During the process of gene amplification using PCR, if very high temperature is not maintained in the beginning, then which of the following steps of PCR will be affected first ? Answer: 3. Denaturation PCR starts with denaturation at about 94°C, which separates the double-stranded DNA into single strands. Without thi... 1
- Persons with ‘AB’ blood group are called as "Universal recipients". This is due to : Answer: 4. Absence of antibodies, anti-A and anti-B, in plasma AB blood group has antigens A and B on RBCs but has no anti-A or anti-B antib... 1
- Receptors for sperm binding in mammals are present on : Answer: 4. Zona pellucida In mammals, sperm-binding receptors are present on the zona pellucida, the glycoprotein layer around the ovum. Bin... 1
- Which enzyme is responsible for the conversion of inactive fibrinogens to fibrins ? Answer: 1. Thrombin Fibrinogen is converted to insoluble fibrin by the enzyme thrombin, which itself is formed from prothrombin by thromboki... 1
- Match List - I with List - II.List - I / List - II(a) Aspergillus niger (i) Acetic Acid(b) Acetobacter aceti (ii) Lactic Acid(c) Clostridium butylicum (iii) Citric Acid(d) Lactobacillus (iv) Butyric AcidChoose the correct answer from the options give… Answer: 1. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii) Aspergillus niger - citric acid (iii) Acetobacter aceti - acetic acid (i) Clostridium buty... 1
- Erythropoietin hormone which stimulates R.B.C. formation is produced by : Answer: 4. Juxtaglomerular cells of the kidney Erythropoietin is secreted by the juxtaglomerular cells of the kidney in response to low oxyg... 1
- Match List - I with List - II.List - I / List - II(a) Vaults (i) Entry of sperm through Cervix is blocked(b) IUDs (ii) Removal of Vas deferens(c) Vasectomy (iii) Phagocytosis of sperms within the Uterus(d) Tubectomy (iv) Removal of fallopian tubeChoo… Answer: 2. (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv) Vaults (barrier method) block entry of sperm through the cervix - (i) IUDs cause phagocyto... 1
- If Adenine makes 30% of the DNA molecule, what will be the percentage of Thymine, Guanine and Cytosine in it ? Answer: 3. T : 30 ; G : 20 ; C : 20 By Chargaff's rule A = T and G = C. A = 30% so T = 30%. A + T = 60%, leaving 40% for G + C, so G = C = 2... 1
- Which of the following secretes the hormone, relaxin, during the later phase of pregnancy ? Answer: 2. Corpus luteum Relaxin, which relaxes pelvic ligaments in late pregnancy, is secreted by the corpus luteum (and placenta). Graafia... 1
- Identify the types of cell junctions that help to stop the leakage of the substances across a tissue and facilitation of communication with neighbouring cells via rapid transfer of ions and molecules. Answer: 2. Tight junctions and Gap junctions, respectively. Tight junctions seal cells and stop leakage of substances across a tissue. Gap j... 1
- Which one of the following statements about Histones is wrong ? Answer: 2. The pH of histones is slightly acidic. Histones are rich in basic amino acids lysine and arginine, which carry positive charge, s... 1
- Which of these is not an important component of initiation of parturition in humans ? Answer: 4. Release of Prolactin Parturition is initiated by foetal signals, rise in oestrogen to progesterone ratio, prostaglandin synthesis... 1
- Match List - I with List - II.List - I / List - II(a) Allen's Rule (i) Kangaroo rat(b) Physiological adaptation (ii) Desert lizard(c) Behavioural adaptation (iii) Marine fish at depth(d) Biochemical adaptation (iv) Polar sealChoose the correct answer… Answer: 3. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii) Allen's rule (shorter extremities in colder climates) - polar seal (iv) Physiological adap... 1
- Which one of the following is an example of Hormone releasing IUD ? Answer: 2. LNG 20 Hormone releasing IUDs release progestogen or hormone slowly into the uterus. LNG-20 releases levonorgestrel. CuT, Cu7 and... 1
- Which of the following statements is incorrect ? Answer: 4. Cyclic photophosphorylation involves both PS I and PS II. Find the incorrect statement. Cyclic photophosphorylation involves only... 1