11th And 12th > Biology
BIOMOLECULES MCQs
Total Questions : 60
| Page 1 of 6 pages
Answer: Option D. ->
480
:
D
According to Chargaff's rules, the amount of adenine is always equal to that of thymine, and the amount of guanine is always equal to that of cytosine i.e A = T (120) and G = C (120), therefore, the total no. of nucleotides would be 120 × 4 = 480.
:
D
According to Chargaff's rules, the amount of adenine is always equal to that of thymine, and the amount of guanine is always equal to that of cytosine i.e A = T (120) and G = C (120), therefore, the total no. of nucleotides would be 120 × 4 = 480.
Answer: Option B. ->
(i) Nuclein (ii) Miescher (iii) Nucleotides (iv) RNA
:
B
The term Nucleic acid is derived from a greek word called Nuclein, coined by Miescher. Each molecule of Nucleic acid has basic units called Nucleotides and the most abundant Nucleic acid is RNA. There is roughly eight times more RNA than there is DNA, because, although DNA stores the much important bio-info, it is RNA which brings it into use. Picture it like this, although the brain is more important than the hands, we have only one brain, but two hands to carry out the work dictated by the brain.
:
B
The term Nucleic acid is derived from a greek word called Nuclein, coined by Miescher. Each molecule of Nucleic acid has basic units called Nucleotides and the most abundant Nucleic acid is RNA. There is roughly eight times more RNA than there is DNA, because, although DNA stores the much important bio-info, it is RNA which brings it into use. Picture it like this, although the brain is more important than the hands, we have only one brain, but two hands to carry out the work dictated by the brain.
Answer: Option C. ->
Sphingolipids
:
C
Sphingosine (2-amino-4-octadecene-1,3-diol) is an 18-carbon amino alcohol with an unsaturated hydrocarbon chain, which forms a primary part of sphingolipids. The derivatives of Sphingosine and fatty acids are what forms Sphingolipids.
:
C
Sphingosine (2-amino-4-octadecene-1,3-diol) is an 18-carbon amino alcohol with an unsaturated hydrocarbon chain, which forms a primary part of sphingolipids. The derivatives of Sphingosine and fatty acids are what forms Sphingolipids.
Answer: Option C. ->
Thermal Denaturation
:
C
Application of heat alters the secondary, tertiary and quaternary structure of proteins. This phenomenon is called thermal denaturation. It is used as a means to study protein structures, folding and polymerisation.
:
C
Application of heat alters the secondary, tertiary and quaternary structure of proteins. This phenomenon is called thermal denaturation. It is used as a means to study protein structures, folding and polymerisation.
Answer: Option B. ->
Hydrogen bonds
:
B
Within the long protein chains there are regions in which the chains are organised into regular structures, which forms the secondary structure of protein. The most common secondary structures are alpha-helices (alpha-helixes) and beta-pleated sheets. These secondary structures are held together by hydrogen bonds.
:
B
Within the long protein chains there are regions in which the chains are organised into regular structures, which forms the secondary structure of protein. The most common secondary structures are alpha-helices (alpha-helixes) and beta-pleated sheets. These secondary structures are held together by hydrogen bonds.
Answer: Option D. ->
Valine
:
D
Amino acids that dissolve in water are hydrophilic amino acid, that is the R- group in these amino acids can interact with water, in contrast with the hydrophobic amino acids that do not interact with water and thereby do not dissolve in it. Of the amino acids listed here valine, with a (CH3−CH−CH3) R-group is the hydrophobic amino acid.
:
D
Amino acids that dissolve in water are hydrophilic amino acid, that is the R- group in these amino acids can interact with water, in contrast with the hydrophobic amino acids that do not interact with water and thereby do not dissolve in it. Of the amino acids listed here valine, with a (CH3−CH−CH3) R-group is the hydrophobic amino acid.
Answer: Option D. ->
Assertion [A] is True and Reason [R] is True but is not a correct explanation to [A].
:
D
:
D
The graph indicates the rate of enzymatic activity (Y - axis) based on increase in temperature (X- axis). As the temperature increases up to a certain level, the rate of enzymatic activity too, increases. It happens so till a certain limit is reached. This threshold is called the Optimum temperature. This is usually around 37.5∘ C which is also the normal human body temperature. But, any further increase in temperature, although should theoretically, increase the rate of activity, it does not because, the protein structure of the enzyme would start to break apart. This is also known as thermal denaturation.
Therefore, the answer is D even though the reason is true.
Answer: Option A. ->
They bind to the substrate and reduce the activation energy of the reaction
:
A
Most reactions in nature would occur very slowly because it has a high activation energy barrier, that is, it requires a very high energy input for the reaction to occur. In presence of an enzyme, the activation energy is lowered and thus the enzyme makes it feasible for the reaction to occur.
:
A
Most reactions in nature would occur very slowly because it has a high activation energy barrier, that is, it requires a very high energy input for the reaction to occur. In presence of an enzyme, the activation energy is lowered and thus the enzyme makes it feasible for the reaction to occur.
Answer: Option A. ->
Succinic dehydrogenase by malonic acid
:
A
:
A
Classical example of competitive inhibition is reduction of activity of succinate dehydrogenase by malonate, oxaloacetate and other anions.
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