Category: GATE Life Science 2011 Previous Year Papers with Solutions

GATE Life Science 2011 Previous Year Papers with Solutions – Authentic Resources by Let’s Talk Academy

For aspirants aiming to crack the GATE Life Science (XL) examination, previous year question papers remain the most reliable preparation tool. The GATE Life Science 2011 previous year paper with solutions is especially important because it represents the early framework of concept-oriented and analytical questions that still dominate the exam today.

At Let’s Talk Academy, aspirants get access to authentic GATE Life Science previous year papers with detailed solutions, designed to support focused self-study and long-term exam success.

Importance of GATE Life Science 2011 Question Paper

Although the exam pattern has evolved, the core Life Science syllabus remains largely unchanged. The 2011 paper tests fundamental concepts that continue to appear in modern GATE examinations.

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Build strong conceptual fundamentals
Understand early GATE question design
Identify high-yield topics across Life Science
Practice real GATE-level MCQs and numericals
Prepare confidently for GATE Life Science 2025 and future exams

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What Is Included in GATE Life Science 2011 Solutions?

The GATE Life Science 2011 solution package by Let’s Talk Academy includes:

Complete GATE 2011 Life Science (XL) question paper
Correct answers with logical reasoning
Step-by-step explanations for theory and numerical questions
Concept mapping with frequently tested topics
Guidance to approach similar questions in upcoming GATE exams

These solutions are suitable for beginners, repeat aspirants, and self-study candidates.

How GATE Life Science 2011 Papers Help in Self-Study

For students preparing independently, previous year papers act as a blueprint of the exam. The 2011 paper helps aspirants:

Practice authentic GATE-level questions
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Q.105 Which of the following amino acid change (mutation) would MOST adversely affect the structure of an α-helix? (A) A valine residue changed to an isoleucine residue (B) A methionine residue changed to a proline residue (C) An aspartic acid residue changed to a glutamic acid residue (D) A histidine residue changed to an arginine residue

Proline Substitution Explained

Q.104 Which of the following statements is/are TRUE about JUXTACRINE signaling? I. The ligand and the receptor engage in reciprocal signaling II. Both the ligand and the receptor are membrane associated proteins III. The ligand gets proteolytically cleaved after binding to the receptor (A) I only (B) II only (C) III only (D) I, II and III

Juxtracrine Signaling True Statements

Q.103 From the point of view of the enzymatic reactions, which of the following DOES NOT belong here? (A) Telomerase (B) Reverse transcriptase (C) Taq polymerase (D) Primase

Enzymatic Reactions Odd One Out

Q.102 The term biological magnification refers to the increased levels of a toxin seen in successive trophic levels in a food web. Which one of the following options correctly states the reason(s) for the increment of a toxin in the ecosystem? (A) The toxin is highly toxic to primary producers, relatively less toxic to primary consumers, and non-toxic to secondary consumers. Thus, a higher level of toxin is seen in species representing higher trophic levels (B) The toxin cannot be degraded by microorganism and consequently persist in the environment for years (C) The toxin to begin with was not toxic or less toxic, but became more toxic by metabolism in the primary producers (D) Both (B) and (C)

Biological Magnification Toxin Increase Reasons

Q.101 Behavioral studies on animals have shown that there is relationship between mechanism of reproduction and male parental care (protecting eggs or the young ones). In aquatic invertebrates, fishes and amphibians for example, the species that practice internal fertilization rarely show male parental care while a majority of species that practice external fertilization tend to exhibit male parental care. This is likely due to (A) the male sex in species that practice internal fertilization are unable to defend against the predators (B) the male sex in species that practice internal fertilization live on female as parasite (C) the fact that the females of species that practice external fertilization die soon after laying the eggs (D) the certainty of paternity in species that practice external fertilization and this behavior is reinforced over generation by natural selection

External Fertilization Male Parental Care

Q.100 The birth control pills contain hormonal formulations that may either arrest the ovulation or prevent the fertilization of egg. Some of the formulations do both. Which one of the following combinations represents a formulation that is likely to affect the process of ovulation and fertilization? (A) Progesterone and estrogen (B) Prostaglandin and estrogen (C) Gonadotrophin and estradiol (D) Prolactin and estradiol

Progesterone Estrogen Combination Explained

Q.99 RNA is considered as the first genetic material to have evolved on the earth. Which one of the following properties of RNA is critical for its functioning as the genetic material in the absence of DNA and protein? (A) The presence of uracil as a base in place of thymine (B) The RNA is less stable than DNA; therefore RNA has higher probability to evolve as genetic material as compared to DNA (C) The single stranded RNA has a genotype as well as phenotype (D) RNA exists in 3 forms while DNA has only one form

RNA First Genetic Material

Q.98 In which one of the following organisms, it is easiest to distinguish mutations on adjacent base pairs of DNA through genetic recombination experiments? (A) Bacteriophages (B) Yeast (C) Escherichia coli (D) Bacillus subtilis

Bacteriophages vs Yeast, E. coli, B. subtilis

Q.97 In a newly discovered organism, normal development was unaffected when a few blastomeres were removed from 100-cell stage embryo. However, removal of five cells at the 1000-cell stage abolished the formation of kidney. Which one of the following options most accurately describes the type(s) of specification operating in the development of this organism? (A) Conditional specification only (B) Autonomous specification only (C) Conditional and autonomous specifications (D) Specification does not occur in this organism

Cell Stage Kidney Development Specification

Q.96 A genetic experiment was performed to map the gene(s) for eye colour in a newly-discovered moth species. Sex determination in this moth species: XY – male and XX – female. When blue-eyed males were mated to green-eyed females, all of both male and female progeny had green eyes. When these progeny were mated among themselves, about half of the males of the resulting second generation had blue eyes; however, all females were green-eyed. Which one of the following is consistent with the above data? (A) Multiple genes control eye colour in this moth species (B) Gene(s) for eye colour is located on the X chromosome (C) Gene(s) for eye colour is located on the Y chromosome (D) Gene(s) for eye colour may not be sex-linked

Moth Eye Color X-Linked

Q.95 Which of the following is TRUE about Kreb’s cycle? (A) Kreb’s cycle generates NADPH (B) The enzymes of Kreb’s cycle reside in the inter-membrane space of a mitochondria (C) It produces ATP, the energy currency of a cell (D) None of the above

Kreb’s Cycle NONE True

Q.94 The term innate behavior refers to an animal behavior (A) that is triggered by an environmental change (B) that is taught by the parent (C) that is developmentally fixed (D) that an organism learns on its own by “a hit-and trial” approach

Innate Behavior Developmentally Fixed

Q.93 Which one of the following hormones is INCORRECTLY paired with its function? (A) Melatonin – biological rhythm (B) Glucagon – increases blood glucose levels (C) Prolactin – stimulates milk secretion (D) Calcitonin – increases blood calcium level

Calcitonin INCORRECTLY Paired

Q.92 Which one of the following examples represents an adaptation or a physiological activity that DOES NOT minimize the loss of body temperature of animals? (A) Feathers or fur (B) Fat layers in the adipose tissue (C) Shivering (D) Vasodilation

Vasodilation Does NOT Minimize Animal Body Temperature Loss

Q.91 In insect’s tracheal system, the transport of oxygen to the target tissue is done by (A) fine branches of air tubes extending to almost every cell (B) a liquid that fills the tracheal tube (C) a specialized set of cells that produce myoglobin (D) a specialized pigment

Insect Tracheal System Oxygen Transport Fine Branches

Q.90 Which of the following is a main symptom of infection by Wuchereria bancrofti? (A) Swelling of limbs (B) Skin rashes (C) Blindness (D) Brain cyst

Wuchereria Bancrofti Main Symptom

Q.89 Which one of the following type of immune cells is responsible for graft rejection? (A) B cells (B) T cells (C) Macrophages (D) Eosinophils

Immune Cells Responsible

Q.88 Extraembryonic tissues are derived from which one of the following? (A) Ectoderm (B) Endoderm (C) Trophectoderm (D) Mesoderm

Extraembryonic Tissues Origin

Q.87 Which one of the following is characteristic of deuterostomes? (A) Radially symmetric body (B) Bilaterally symmetric body (C) Presence of well-defined digestive system (D) Formation of anus from blastopore

Deuterostome Characteristic

Q.86 Which one of the following is an example of eumetazoans? (A) Dictyostelium (B) Hydra (C) Sponges (D) Volvox

Eumetazoans Examples Hydra

Q.85 Match the pair of organisms in Group 1 with their characteristic interactions in Group 2 Group 1 P. Photoblepharon palpebratus and Vibrio fischeri Q. Pseudomonas and Bdellovibrio R. Aspergillus and Pseudomonas S. Thiobacillus ferrooxidans and Beijerinckia lactogenes Group 2 1. Mutualism 2. Symbiosis 3. Antagonism 4. Parasitism (A) P-2, Q-4, R-3, S-1 (B) P-2, Q-3, R-4, S-1 (C) P-4, Q-2, R-3, S-1 (D) P-2, Q-4, R-1, S-3

Microbial Interactions Matching

Q.84 An actively growing culture (20 ml) of E. coli (1 × 105 per ml) was mixed with a total of 100 T4 phage particles, grown further for 40 min and mixed with a few drops of chloroform. Under the conditions used, the generation time of E. coli is 30 min, the infection cycle of phage T4 is 20 min, and the burst size is 100. Assuming that each infection was a successful one, how many plaque forming units would you expect at the end of the experiment? (A) 104 (B) 103 (C) 105 (D) 106

E Coli T4 Phage Plaque Forming Units

Q.83 Based on their properties, match the “Genera” in Group 1 with those in Group 2 Group 1 P. Bacillus Q. Neisseria R. Rhizobium S. Caulobacter Group 2 1. Sarcina 2. Azotobacter 3. Hyphomicrobium 4. Clostridium (A) P-4, Q-1, R-2, S-3 (B) P-4, Q-1, R-3, S-2 (C) P-2, Q-4, R-1, S-3 (D) P-1, Q-4, R-2, S-3

Bacillus Neisseria Rhizobium Caulobacter Genera Properties Matching

Q.82 A new isolate of a facultative anaerobe utilizes either oxygen or pyruvate as terminal electron acceptor. This bacterium was grown either anaerobically with glucose as sole carbon source; or aerobically with lactose as the sole carbon source. Net increase in ATP production (per mole of the carbon source) during the aerobic growth would be (A) 2-fold (B) 4-fold (C) 19-fold (D) 38-fold

Net Increase in ATP Production During Aerobic Growth

Q.81 During replication of the E. coli chromosome, Okazaki fragments are produced from (A) only one of the strands of the circular genome (B) both the strands of the circular genome (C) one of the strands in one generation and the other strand in the next generation (D) both the strands of the circular genome provided that the heavy nitrogen (15N) is present in the medium

E. coli Okazaki Fragments Both Strands

Q.80 Match the names of investigators in Group 1 with their contributions in Group 2: Group 1 P. Joseph Lister Q. John Needham R. Elie Metchnikoff S. Lazaro Spallanzani Group 2 1. Role of phagocytosis in infection 2. Disproved spontaneous generation 3. Proved spontaneous generation 4. Use of agar as solidifying agent 5. Use of carbolic acid as disinfectant (A) P-5, Q-3, R-4, S-1 (B) P-5, Q-3, R-1, S-2 (C) P-4, Q-3, R-1, S-5 (D) P-3, Q-2, R-1, S-4

Matching Microbiology Pioneers and Contributions

Q.79 Which of the statements about Corynebacterium diphtheriae biology is NOT CORRECT? (A) All strains of C. diphtheriae are producers of diphtheria toxin (B) Diphtheria toxin production can be minimized by high concentration of iron in the medium (C) Diphtheria toxin inhibits protein synthesis (D) Diphtheria toxin is an A-B toxin secreted as a polypeptide of 62 kDa

Corynebacterium Diphtheriae Toxin Biology

Q.78 An actively growing culture of E. coli divides in about 20 min. Under laboratory conditions, time taken to replicate the entire genome of this bacterium would be about: (A) 20 min (B) 40 min (C) 10 min (D) 18 min

E. coli Genome Replication Time vs Division

Q.77 Which one of the following forms of the same DNA molecule would bind maximum ethidium bromide? (A) Negatively supercoiled (B) Covalently closed relaxed circle (C) Linear (D) Positively supercoiled

Which DNA Form Binds Maximum Ethidium Bromide

Q.76 Four Hfr strains of E. coli were generated from the same F+ strain. The Hfr strains donated markers in the following order: Strain 1: DQWMT; Strain 2: AXPTM; Strain 3: BNCAX; Strain 4: BDQWM The order of the markers in the original F+ strain is: (A) DQWMTPXACNB (B) AXPTMDQWBNC (C) BNCAXPTMDQW (D) BDQWMNCAXPT

Hfr Strains E. coli Marker Order

$Q.75 Which one of the following immersion oils would you use to get the best resolution in a light microscope (with 100× objective)? (A) an oil with refractive index of 1.6 (B) an oil with refractive index of 1.5 (C) an oil with refractive index of 1.4 (D) an oil with refractive index of 1.3$