Zoology
- A gene whose expression helps to identify transformed cell is known as : Answer: 4. Selectable marker A selectable marker is a gene whose expression lets us identify and select transformed cells, for example an an... 1
- Which among these is the correct combination of aquatic mammals ? Answer: 2. Whales, Dolphins, Seals Aquatic mammals are mammals that live in water: whales, dolphins and seals. Trygon (sting ray) and sharks... 1
- A temporary endocrine gland in the human body is : Answer: 2. Corpus luteum The corpus luteum forms from the ruptured Graafian follicle after ovulation, secretes progesterone, and degenerates... 1
- Myelin sheath is produced by : Answer: 4. Schwann Cells and Oligodendrocytes The myelin sheath is formed by glial cells that wrap around axons. In the peripheral nervous s... 1
- Match the following sexually transmitted diseases (Column - I) with their causative agent (Column - II) and select the correct option.Column - I: (a) Gonorrhea (b) Syphilis (c) Genital Warts (d) AIDSColumn - II: (i) HIV (ii) Neisseria (iii) Treponema… Answer: 4. (ii) (iii) (iv) (i) Match each disease with its pathogen. (a) Gonorrhea: Neisseria gonorrhoeae = (ii) (b) Syphilis: Treponema pal... 1
- Select the correct route for the passage of sperms in male frogs : Answer: 3. Testes → Vasa efferentia → Kidney → Bidder's canal → Urinogenital duct → Cloaca In a male frog, sperms travel: testes → vasa effe... 1
- What is the criterion for DNA fragments movement on agarose gel during gel electrophoresis ? Answer: 1. The smaller the fragment size, the farther it moves Key idea: The gel acts as a sieve. All DNA fragments are negatively charged a... 1
- Which of the following represents order of 'Horse' ? Answer: 1. Perissodactyla Key idea: The classification of the horse is: Kingdom Animalia, Phylum Chordata, Class Mammalia, Order Perissodact... 1
- The hepatic portal vein drains blood to liver from : Answer: 3. Intestine Key idea: The hepatic portal vein carries nutrient-rich blood from the digestive organs to the liver. Of the options, t... 1
- GnRH, a hypothalamic hormone, needed in reproduction, acts on : Answer: 1. anterior pituitary gland and stimulates secretion of LH and FSH. Key idea: Hypothalamic releasing hormones act on the anterior pi... 1
- Receptor sites for neurotransmitters are present on : Answer: 3. post-synaptic membrane Key idea: At a chemical synapse the neurotransmitter crosses the cleft and binds to receptors on the next... 1
- The pivot joint between atlas and axis is a type of : Answer: 2. synovial joint Key idea: Joints that allow free movement are synovial. The atlas-axis joint (the odontoid process turning in a ri... 1
- In case of a couple where the male is having a very low sperm count, which technique will be suitable for fertilisation ? Answer: 2. Artificial Insemination Key idea: When the male has a very low sperm count, semen is collected, concentrated and placed in the fe... 1
- The function of copper ions in copper releasing IUD's is : Answer: 4. They suppress sperm motility and fertilising capacity of sperms. Key idea: Cu ions released by the IUD act mainly on sperm. Coppe... 1
- Which of the following options best represents the enzyme composition of pancreatic juice ? Answer: 3. lipase, amylase, trypsinogen, procarboxypeptidase Key idea: Pancreatic juice contains inactive and active digestive enzymes for a... 1
- DNA fragments are : Answer: 1. Negatively charged Key idea: DNA has a phosphate group on each nucleotide. The phosphate groups carry a negative charge, so every... 1
- The process of separation and purification of expressed protein before marketing is called : Answer: 1. Downstream processing Key idea: Making a product has two stages. Upstream processing covers growing the cells in a bioreactor. Do... 1
- The DNA fragments separated on an agarose gel can be visualised after staining with : Answer: 3. Ethidium bromide Key idea: DNA bands on agarose are seen with a dye that binds DNA and fluoresces. Ethidium bromide intercalates... 1
- An important characteristic that Hemichordates share with Chordates is : Answer: 2. pharynx with gill slits Key idea: Hemichordates (e.g. Balanoglossus) share pharyngeal gill slits with chordates. (1) Hemichordate... 1
- Homozygous purelines in cattle can be obtained by : Answer: 4. mating of related individuals of same breed. Key idea: Inbreeding increases homozygosity. Mating of closely related individuals o... 1
- Adult human RBCs are enucleate. Which of the following statement(s) is/are most appropriate explanation for this feature ?(a) They do not need to reproduce(b) They are somatic cells(c) They do not metabolize(d) All their internal space is available f… Answer: 2. (a), (c) and (d) Key idea: Losing the nucleus suits the RBC for its single job, carrying oxygen. (a) Mature RBCs do not divide, s... 1
- A baby boy aged two years is admitted to play school and passes through a dental check - up. The dentist observed that the boy had twenty teeth. Which teeth were absent ? Answer: 2. Pre-molars Key idea: A two-year-old has milk (temporary) teeth only, with dental formula 2102/2102 . Per half-jaw: 2 incisors, 1... 1
- Which of the following statements is correct ? Answer: 4. The ascending limb of loop of Henle is impermeable to water. Key idea: The two limbs of the loop of Henle differ in permeability,... 1
- Out of 'X' pairs of ribs in humans only 'Y' pairs are true ribs. Select the option that correctly represents values of X and Y and provides their explanation : Answer: 4. X=12, Y=7 True ribs are attached dorsally to vertebral column and ventrally to the sternum. Key idea: Humans have 12 pairs of rib... 1