Apart From This
Updated: 22-Nov-09
Test Paper
NATIONAL STANDARD EXAMINATION BIOLOGY (NSEB)--2000
REPRESENTATIVE QUESTIONS
1. The morphological appearance of an organism for any trait is called:
a. genotype | b. phenotype |
c. dominance | d. allelomorphism |
2. Synthetic DNA template when mixed with an enzyme phosphatase will give:
a. nucleotide | b. nucleoside |
c. nucleosome | d. nitrogenous base |
3. The beta-pleated sheets of fibrous proteins consists of closely packed polypeptide chains. These chains, in turn, consist of certain types of amino acids, such as:
a. Phenylalanine, with a methyl-benzene as the R group | b. Glycine, with H as the R group | c. Alanine, with Methyl as the R group |
d. Both b and c are correct | e. a,b and c are correct | |
4. In the cell cycle, replication of chromosomal DNA takes place in:
a. prophase | b. anaphase | c. interphase |
d. telophase | d. metaphase | |
5. The carbohydrate component of a nucleic acid is:
a. hexose | b. pentose |
c. heptose | d. triose |
6. In a living cell, the site of anaerobic respiration is:
a. cytoplasm | b. mitochondria |
c. cell membrane | d. cell wall |
7. Cross pollination offers certain advantages as well as disadvantages to plants. Which ONE of the following statements is not true about cross pollination: Cross pollination...
a. can fail to take place due to distance barrier |
b. is less economic because plants have to produce large number of pollen grains |
c. often gives high yields of a crop |
d. takes place only in monocious (unisexual) flowers. |
8. The major chemical moiety of a phospholipid that contributes for energy production is:
a. fatty acid | b. glycerol |
c. phospate | d. all of the above |
9. Monoclonal antibodies are important medical tools today due to ONE of its following properties:
a. amazing specificity for matching antigen |
b. high sensitivity for detection |
c. diverse specificity for several antigens |
d. all the above are true |
10. Red blood cells when immersed in 1.2% saline solution and observed under microscope show:
a. bursting | b. shrinkage |
c. intact round cells | d. bulging |
11. Mechanism by which the minerals enter the root cells without the use of ATP is:
a. transpiration pull | b. ion exchange |
c. carrier transport | d. vein loading |
12. Auxins cannot be considered as catalysts as they are:
a. inactivated by light |
b. used up in the growth process |
c. non-proteinaceous in nature |
d. active only in large concentrations |
13. Gibberillins are known to break dormancy in cereal seeds. This dominantly is due to the secretion of :
a. protease | b. lipase |
c. alphs amylase | d. cellulase |
14. The branch of science that deals with the study of diseases is:
a. microbiology | b. bacteriology |
c. pathology | d. endocrinology |
15. The mammalian red blood cells are biconcave in shape. This is advantageous because:
a. it offers greater flexibility |
b. it offers greater surface area |
c. it can easily fit into cappilaries |
d. it can stack upon each other like a pile of coins |
16. A suspension of paramecia is subjected to centrifugation. When the centrifugation is stopped,they immediately distribute uniformly in the suspended medium. This behavioral pattern represents:
a. negative geotaxis |
b. diatropism (movement at right angle to the direction of stimulus) |
c. hydrotopism |
d. none of the above |
17. Which ONE of the following structures is nutritionally dependent on the parent plant:
a. mature moss gamtophyte |
b. mature moss sporophyte |
c. mature fern gametophyte |
d. mature fern sporophyte |
18. Several properties of water, such as its stronge cohesive forces and high heat capacity, make it an ideal biological solvent. These properties are attributed to the abundance of:
a. covalent bonds | b. hydrogen bonds |
c. co-ordinate bonds | d. non-polar interactions |
19. Biochemical reagents are widely used for detection of biomolecules. A reagent that specifically detects a carbonyl group (C=O) in a biomolecule will yield a positive test with:
a. protein | b. fatty acid |
c. carbohydrate | d. all the above |
20. The amount of haemoglobin packed per one RBC is 3.2 ´ 10-11 gms. Hence the number of molecules of haemoglobin in one RBC is:
Note: Mol. weight of Hg: 64,500.
a. 300 molecules | b. 30,000 molecules |
c. 300 '106 molecules | d. 300 ´ 109 molecules |
21. The possible number of tripeptide sequences that could be made with 2 amino acids is:
a. 8 | b. 3 |
c. 6 | d. 9 |
22. A DNA template was found to contain 29% of adenine bases. The % of G+C in this template will be:
a. 58 | b. 42 |
c. 71 | d. 29 |
23. (i) glucose-1-phosphate---a---->glucose-6-phosphate
(ii) glucose-6-phosphate---b---->fructose-6-phosphate
a and b represent the two enzymes that catalyse the above reactions. These enzymes belong to:
a. a:transferase; b:isomerase | b. a:isomerase; b:isomerase |
c. a:ligase; b:isomerase | d. a:tranferase; b:hydrolase |
24. The site of lipid synthesis in a eucaryotic cell is:
a. cell membrane | b. endoplasmic reticulum |
c. golgi bodies | d. microbodies |
25. In fruits and flowers, the colour pigments are located in:
a. cytoplasm | b. vacuole | c. mesophyll |