School Blog
Facebook Page
Facebook Group
Philosophy
Astronomy
Send us a mail


NATIONAL STANDARD EXAMINATION BIOLOGY (NSEB)--2000

REPRESENTATIVE QUESTIONS

1. The morphological appearance of an organism for any trait is called:

a. genotypeb. phenotype
c. dominanced. allelomorphism

2. Synthetic DNA template when mixed with an enzyme phosphatase will give:

a. nucleotideb. nucleoside
c. nucleosomed. 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 groupb. Glycine, with H as the R groupc. Alanine, with Methyl as the R group
d. Both b and c are correcte. a,b and c are correct

4. In the cell cycle, replication of chromosomal DNA takes place in:

a. prophaseb. anaphasec. interphase
d. telophased. metaphase

5. The carbohydrate component of a nucleic acid is:

a. hexoseb. pentose
c. heptosed. triose

6. In a living cell, the site of anaerobic respiration is:

a. cytoplasmb. mitochondria
c. cell membraned. 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 acidb. glycerol
c. phospated. 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. burstingb. shrinkage
c. intact round cellsd. bulging

11. Mechanism by which the minerals enter the root cells without the use of ATP is:

a. transpiration pullb. ion exchange
c. carrier transportd. 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. proteaseb. lipase
c. alphs amylased. cellulase

14. The branch of science that deals with the study of diseases is:

a. microbiologyb. bacteriology
c. pathologyd. 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 bondsb. hydrogen bonds
c. co-ordinate bondsd. 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. proteinb. fatty acid
c. carbohydrated. 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 moleculesb. 30,000 molecules
c. 300 '106 moleculesd. 300 109 molecules

21. The possible number of tripeptide sequences that could be made with 2 amino acids is:

a. 8b. 3
c. 6d. 9

22. A DNA template was found to contain 29% of adenine bases. The % of G+C in this template will be:

a. 58b. 42
c. 71d. 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:isomeraseb. a:isomerase; b:isomerase
c. a:ligase; b:isomerased. a:tranferase; b:hydrolase

24. The site of lipid synthesis in a eucaryotic cell is:

a. cell membraneb. endoplasmic reticulum
c. golgi bodiesd. microbodies

25. In fruits and flowers, the colour pigments are located in:

a. cytoplasmb. vacuolec. mesophyll
d. cell membranee. all of the above


Copyright@Kedar Soni