21- To avoid the formation of toxic compounds with ______ substance is used for disinfecting water?
A. KMnO₄
B. Chloramines
C. O₃
D. Alums
View Answer
Answer : B. Chloramines
Description
22- Which one of the following is called animal starch?
A. Amylose
B. Cellulose
C. Glycogen
D. Glycine
View Answer
Answer : C. Glycogen
Description
23- Enzymes are ______ that catalyze chemical living organisms and are very specific in their action:
A. Proteins
B. Vitamins
C. Lipids
D. Minerals
View Answer
Answer : A. Proteins
Description
24- HCOOH is the structure of:
A. Acetic acid
B. Formic acid
C. Valeric acid
D. Caproic acid
View Answer
Answer : B. Formic acid
Description
25- The reaction CH≡CH + H₂O + 3(O) shows the formation of ______.
A. Acetic acid
B. Picric acid
C. Oxalic acid
D. Formic acid
View Answer
Answer : C. Oxalic acid
Description
26- In composition of natural gas 0.17% is constituted by:
A. Methane
B. Ethane
C. Butane
D. Nitrogen
View Answer
Answer : B. Ethane
Description
27- By fermentation process of starch and by the catalytic a enzyme ______ is produced.
A. Methyl alcohol
B. Ethyl alcohol
C. Acetyl alcohol
D. Methanol
View Answer
Answer : B. Ethyl alcohol
Description
28- Methyl ketones can be characterized by performing:
A. Iodoform test
B. Schiff’s test
C. Benedict reagent test
D. Tollen’s test
View Answer
Answer : A. Iodoform test
Description
29- In RNA, which of the base is replaced by uracil?
A. Cytosine
B. Adenine
C. Guanine
D. Thymine
View Answer
Answer : D. Thymine
Description
30- In the atmosphere, CO₂ is about:
A. 0.01
B. 0.03
C. 0.05
D. 0.09
View Answer
Answer : B. 0.03
Description
31- Chlorophyll, a naturally occurring macromolecule contain:
A. Mg²⁺
B. Al
C. Fe
D. B
View Answer
Answer : A. Mg²⁺
Description
32- The reactions of below diagram with RMgX leads to the for of:
A. RCHOHR
B. RCHOHCH₃
C. R₂CHCH₂OH
D. RCH₂CH₂OH
View Answer
Answer : D. RCH₂CH₂OH
Description
33- Alkyl halides can also be obtained by halogenation of ______.
A. Alcohols
B. Alkenes
C. Alkanes
D. Ketones
View Answer
Answer : C. Alkanes
Description
34- Which of the following is necessary for the normal development of leaves and bark of the plants.
A. Sodium
B. Aluminium
C. Calcium
D. Beryllium
View Answer
Answer : C. Calcium
Description
35- Which of the following fertilizers has maximum percentage of nitrogen in solid state?
A. Ammonia
B. Urea
C. Di ammonium hydrogen phosphate
D. Ammonium nitrate
View Answer
Answer : B. Urea
Description
36- Most bacteria require vitamins for which of the purpose?
A. Source of energy
B. Growth factors
C. Source of carbon
D. Source of electron donors
View Answer
Answer : B. Growth factors
Description
37- Germs theory of disease was proposed by:
A. Leeuwenhoek
B. Louis Pasteur
C. Walther Flemming
D. Robert Koch
View Answer
Answer : D. Robert Koch
Description
38- Freeding of an object from all living organisms bacteria and their spores, fungi and their sp:
A. Sterilization
B. Disinfection
C. Decontamination
D. Immunization
View Answer
Answer : A. Sterilization
Description
39- The process by which various components of cells including its organelle can be isolated is called:
A. Homogenization
B. Cell fractionation
C. Cell fixation
D. Cell electrophoresis
View Answer
Answer : B. Cell fractionation
Description
40- Which of the following correctly shows structures which are found in a eukaryotic cell? (Yes = present; No = absent)
Nuclear membrane Mitochondria Ribosomes
