jam.iitm.ac.in Biological Sciences Question Paper Model : Indian Institute of Technology Madras

Name of the Organisation : Indian Institute of Technology Madras
Name of the Exam : JAM Exam
Document Type : Sample Question Paper
Name of the Subject : Biological Sciences (BL)

Website : jam.iitm.ac.in
Download Sample Question Paper 2015 : https://www.pdfquestion.in/uploads/7701-BLQP2015.pdf
Download Sample Question Paper 2014 : https://www.pdfquestion.in/uploads/7701-BLQP2014.pdf
Download Sample Question Paper 2013 : https://www.pdfquestion.in/uploads/7701-BLQP2013.pdf

JAM 2014 Biological Sciences Sample Questions :

1. Transposons are distributed throughout the human genome and constitute about 45% of the genome. Retrotransposons are

Related : Indian Institute of Technology Madras Mathematical Statistics Question Paper Sample : www.pdfquestion.in/7712.html

(A) transposable elements that transpose from one site to another in the genome via reverse transcription through an RNA intermediate
(B) repetitive sequences in the genome
(C) DNA elements which move in the genome
(D) satellite DNA sequences
2. Several enzymes are involved in DNA repair pathways. Which one of the following enzymes is also referred to as a suicidal enzyme?
(A) Ligase
(C) Methyltransferase
(B) Polymerase
(D) Excision repair enzyme
3. In the lactose operon, the lac repressor binds to the operator and does NOT allow RNA polymerase to bind to the promoter. Allolactose reduces the af?nity of the repressor. for the lac operator by binding and changing its conformation. Thus, addition of lactose or a synthetic inducer stimulates the transcription of the lac operon structural genes. Synthetic inducers are called gratuitous inducers because
A) they will be metabolized by beta-galactosidase to glucose and galactose
(B) they activate transcription but are NOT metabolized
(C) their removal does NOT lead to immediate inhibition of induced transcription
(D) RNA polymerase CANNOT bind to promoter in their presence
4. Group I lists certain plant fungal diseases. Group H lists the causative agents. Match the diseases with the corresponding causative agents.
Group I Group II
P. Damping off disease 1. Phytophthora infestans
Q. Late blight or rot disease of potato 2. Pythium debaryanum
R. Downy mildew 3. Peronospora parasitica
S. Club root disease of broccoli 4. Plasmodiophora brassicae
(A) P—2, Q—l, R—3, 8—4 (B) P—l, Q—2, R—4, S—3
(C) P—3, Q—2, R—4, S—l (D) P—2, Q—3, R—l, 84
5. Some mushrooms are poisonous and are popularly called Z‘death caps” or “destroying angels”. Which one of the following is the deadliest mushroom?
(A) Amanita verna (B) (C) A garicus xanthodermus (D) Pleurotus sajar-caju
6. Flower is a modi?ed shoot or a branch. Which one of the following DOES NOT provide evidence in support of the above statement?
(A) Axis nature of the thalamus
(B) Leaf-like arrangement of the ?oral members
(C) Homology of ?oral and vegetative buds
(D) Occurrence of mitosis in the ?oral tissues
7. A few bacterial genera have cell walls composed of pseudomurein. These polymeric structures resemble eubacterial peptidoglycan but are very different in composition. Which one of the following possesses such structures in its cell wall?
(A) Salmonella (B) Methanobacterium (C) Streptococcus (D) Mycobacterium
8. Anoxygenic photosynthetic bacteria possess bacteriochlorophyll which absorbs light in the
(A) visible range (B) (C) same range as plant chlorophylls (D) infra-red region ultra-violet region
9. Which one of the following statements on ‘cro repressor’ and ‘immunity repressor’ of lambda phage is NOT correct?
(A) Both bestow immunity to externally infecting phage
(B) Both inhibit phage gene expression and help in the integration into host genome
(C) The production and maintenance of the lysogenic state is due to the antagonism of two repressors
D U on infection b lambda phage, cro gene is transcribed resultin in the s thesis of a PYgYn protein repressor that inhibits the synthesis of immunity repressor
10. Following uncoating in the cytoplasm, parental (+)-strand RNA of poliovirus is used as template for the synthesis of the polymerase that catalyzes the formation of the (—)-strand RNA. This enzyme is called
(A) reverse transcriptase
(C) RNA-dependent RNA polymerase
(B) DNA-dependent RNA polymerase
(D) RNA-dependent DNA polymerase
11. Viriods are agents of infectious diseases. Which one of the following statements is NOT correct?
(A) Viriods usually do NOT possess a protein coat
(B) Viriods replicate autonomously in cells of susceptible plant species
(C) Viriods comprise of infectious molecules of RNA
(D) Viriods need helper viruses to infect host plant

JAM 2015 Biological Sciences :
Q.1 In the binding of oxygen to hemoglobin, a plot of the fractional saturation of hemoglobin versus the
partial pressure of oxygen can best be described as
(A) hyperbolic (B) sigmoidal
(C) linear with a negative slope (D) linear with a positive slope
Q.2 A polypeptide chain is made up of 101 amino acid residues. The polypeptide has 200 bonds about which rotation can occur. Assume that three orientations are possible about each of these bonds.
Based on these assumptions, how many random coil conformations are possible for the polypeptide chain?
(A) 3200 (B) 2003 (C) 101 x 3200 (D) 101 x2003
Q.3 Which of the following acids can be used as one of the components in a buffer?
(A) Nitric acid (B) Sulfuric acid (C) Acetic acid (D) Hydrochloric acid
Q.4 The bacteria that require “specialized nutrients for growth”, which can be difficult to meet in the laboratory, are called
(A) facultative (B) obligate (C) fastidious (D) non-fermentor
Q.5 During urine formation, reabsorption of glucose and amino acids occurs from the glomerular filtrate in the “P” part of the nephron by the “Q” process. Choose the correct combination of P and Q.
(A) P – distal convoluted tubule Q – primary active transport
(B) P – ascending loop of Henle Q – secondary active transport
(C) P – proximal convoluted tubule Q – secondary active transport
(D) P – descending loop of Henle Q – passive diffusion
Q.6 Monoglycerides and long chain fatty acids are absorbed in the intestine. How are these molecules transported to the circulating capillary blood?
(A) In the form of chylomicrons through lymphatic duct
(B) Direct and facilitated diffusion
(C) Primary active transport
(D) Secondary active transport via a carrier protein
Q.7 An individual’s HLA haplotype is
(A) one allele at each MHC Class I locus
(B) the individual’s Class I antigen type
(C) one allele at each MHC Class II locus
(D) the individual’s complete set of MHC alleles
Q.8 Biomedical importance of specialized transduction in bacteria is due to the
(A) acquisition of Hfr plasmid
(B) transfer of genes for toxin production
(C) transfer of genes for capsule formation
(D) incorporation of jumping genes
Q.9 Which of the following pairs of cellular organelles is involved in the energy generation as well as metabolite production in a typical eukaryotic cell?
(A) Chloroplast and Lysosome
(B) Mitochondrion and Golgi body
(C) Endoplasmic reticulum and Mitochondrion
(D) Mitochondrion and Chloroplast
Q.10 The “symplast pathway” of transport in a typical plant system does NOT involve
(A) plasmodesmata (B) transport proteins in plasma membrane
(C) cell wall and intercellular space (D) cytoplasm