StudentAidUnit 4: Biomolecules — Mcqs
11th Class Biology · Unit 4: Biomolecules
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Multiple Choice Questions (Exercise)
1.Which characteristics of water molecules is responsible for most of the unique properties of water?
2.To which group of lipids, the human sex hormones belong?
3.Which of the following is NOT a protein?
4.Which one is the largest carbohydrate?
5.What compound would be manufactured difficulty when soil has a shortage of phosphorous?
6.A compound whose chemical composition is most closely related to maltose is:
7.Which group is found in all fatty acids?
8.Haemoglobin has:
9.Which process produces peptide bonds?
SLO Based Multiple Choice Questions
Biological Molecules
10.Basic knowledge of biochemistry helps to understand anatomy and ............
11.The type of metabolic reactions in which simpler substances are combined to form complex substance are called:
12.The percentage of water which makes the living mass of living organism is at least:
- a 60%
- b 70%
- c 80%
- d 90%
13.Proteins, nucleic acids and lipids make ………. of the dry mass of living organisms:
- a 93%
- b 7%
- c 78%
- d 50%
14.Molecule consisting of many identical molecular units is called:
Types of bonds in biology
15.Which bond have stored energy and known as potential source of energy?
16.Atom A shares its electron with Atom B which type of chemical bond is most likely to be formed between them?
17.Sodium atom loses its electron and becomes cation, while chlorine accepts that electron and becomes anion, an electrostatic attraction is created between them, which is also called as:
18.The bond which helps in maintaining the structure of large molecules like proteins, nucleic acids, as well as DNA replication is:
19.Non-polar molecules tend to cluster together in aqueous environments to minimize contact with water molecules. This phenomenon is termed as:
20.Which type off reaction is being shown below: Glucose + Glucose -> Maltose + Water
- a Dehydration synthesis
- b Condensation
- c Hydrolysis
- d Both (a) and (b)
21.Breakdown of maltose into two glucose monomers by the addition of water molecules is an example of:
Importance of Water
22.The concentration of water in different organisms, varies from:
23.Which one of the following is not a hydrophilic molecule?
24.★If there were no hydrogen bonding in water, then the water would boil at ...... and freeze at ......:
25.When oil is dropped into water, oil is excluded from water forming strong associations among themselves, this phenomenon is called:
- a Hydrophobic exclusion
- b Hydrophobic interaction
- c Hydrogen bonding
- d Hydrophilic interaction
26.Water's high heat capacity benefits living tissues by:
27.The specific heat of vaporization of water is:
- a 570 Kcal/kg
- b 374 cal/moles
- c 574 kcal/kg
- d 717.6 kcal/gram
28.★Evaporation of 2ml of water out of 1 litre lowers the temperature of remaining 998ml water by:
29.Surface tension allows water striders to walk on water due to:
30.At room temperature (25°C), in a litre of water, out of 550 million water molecules, only …… gets ionized:
31.Water exhibits its maximum density at:
32.Ice floating protects aquatic ecosystems by:
Carbohydrates
33.During photosynthesis, when reduction of CO2 occurs, the resulting sugar molecule contains carbon, hydrogen and oxygen in molar ratio:
34.Which one of the following is NOT a hexose?
35.The primary energy-storage molecule is glucose, and the number of CH-bonds in it are:
36.Glucose and galactose have a difference in the orientation of one OH (hydroxyl) group at:
37.Which of the following hexoses show stereoisomerism?
38.The sugar which acts as a precursor in photosynthesis is:
39.In case of glucose, oxygen-bridge develops between:
40.Glucose molecule having OH group on upper/above side is termed as:
41.The Fischer projection was devised by German chemist Emil Fischer in:
42.Which is NOT related to maltose?
43.The disaccharide found only in mammalian milk, which is main source of energy for infant of mammals is:
44.Which of the following is the most familiar disaccharide?
45.Lactose intolerance arises from deficiency of an enzyme that breaks:
46.Compared to amylose, amylopectin is digested at faster rate because:
47.High-fructose corn syrup has replaced …… as a sweetener:
48.Glucose is ……. as sweet as sucrose:
49.Chitin differs from cellulose in having:
50.Cellulose is not digested by humans because:
51.Starch coils into helices, while cellulose forms straight chains, due to differences in:
52.Modified form of cellulose is called:
53.Which one of the following polysaccharide is found in the cell walls of red algae?
54.The straight chains of cellulose are linked together by …… to form cellulose microfibrils:
Proteins
55.The term "Protein" was coined by:
56.The most abundant organic biomolecules in cells are:
57.The total number of different types of amino acids that have been reported to occur in living organisms is:
- a 25
- b 20
- c 170
- d 300
58.Which group of amino acid is responsible for its identity and unique chemical properties:
59.Which one of the following amino acid is not synthesized by our bodies?
60.★Disaccharides and dipeptides are formed as a result of:
61.Number of peptide bonds in tetrapeptide are/is:
62.If hemoglobin's quaternary structure was disrupted what would be the immediate consequence?
63.In the primary structure of insulin alpha chain has 21 amino acids while beta chain has 30 amino acids, both these chains are joined by:
64.Sickle cell hemoglobin valine takes the place of:
65.The proteins get coiled or folded within polypeptide chain at:
66.The bond which maintains secondary structure of a protein is:
67.The globular structure of a protein is maintained by ……… bonds:
68.Aggregation of tertiary structures makes ……… structure of protein:
69.Which one of the following proteins can be crystallized?
70.A researcher discovers a protein that changes shape when pH drops below 6.5. This protein is most likely:
71.A patient with a clotting disorder likely has a deficiency in:
72.The class of proteins that catalyse the metabolism of cells is:
73.A geneticist working in his lab wants to selectively allow some genes to work, he uses ………. proteins to regulate particular gene action:
- a Ferritin
- b Na-K pump
- c Repressors
- d Activators
74.Blood ferritin levels are measured in patients as a diagnostic tool of most likely:
75.Casein is an example of protein that:
76.Actin and myosin are critical for:
77.Fibrous proteins are characterized by:
78.What is the primary role of antibodies?
Lipids
79.Lipids are insoluble in water due to their:
80.A student of science working in lab mixes ethanol in an acetic acid, most-like the compound formed will be:
81.Triacylglycerol's are composed of:
82.When organisms have to store glucose for longer periods, they usually convert it into:
83.The honey bees use to make hexagonal chambers of their combs, by producing:
84.Which one of the following is not a part of waxes?
85.The "fluid mosaic model" of cell membranes is primarily composed of:
- a Phospholipids
- b Sphingolipids
- c Glycolipids
- d Both (a) and (c)
86.The tail of phospholipids faces inwards in a cell membrane because it is:
87.Formula of isoprene unit is:
88.The type of lipid found in our retinal pigments in eyes is:
89.Testosterone is made up of:
90.Anabolic steroids were originally developed for the treatment of:
91.The common steroid, that is a part of animal cell membranes is:
92.Identify a compound which is lipid but have modified fats, with non-polar tails attached to a 5 – carbon ring:
- a Cholesterol
- b Phospholipid
- c Acylglycerol
- d Prostaglandin
93.Which statement about prostaglandins is FALSE?
94.The reason behind Aspirin's ability to reduce inflammation, pain and fever is that it is a:
95.Which one of the following is NOT the function of cholesterol?
96.Lipids transport which of the following vitamins?
Nucleic Acids
97.Which pentose sugar is present in RNA but not in DNA?
98.Thymine is exclusively found in:
99.A nucleoside consists of:
100.The back bone of nucleic acids is formed by:
101.Phosphodiester bonds in DNA are formed between:
102.Which of the following is a purine base?
103.ATP is structurally a:
104.In a polynucleotide chain, the free ends are:
105.According to Watson and Crick model, "the poles" of DNA double helix are composed of:
106.Number of hydrogen bonds between G and C in a DNA helix are:
107.According to Chargaff's rule, DNA has:
108.The amount of DNA in mitochondria and chloroplast is:
- a 1%
- b 2%
- c 23%
- d 6.1%
109.In the chromosomes of E. coli, each strand of DNA contains ……… bases arranged in ……… order.
- a 5 million, circular
- b 3 million, linear
- c 8 million, circular
- d 5 million, linear
110.Which type of RNA carries the genetic message from DNA to ribosomes?
111.Clover leaf structure is the characteristics of:
112.Ribosomal RNA comprises approximately what percentage of total cellular RNA?
113.During translation; tRNA molecules are responsible for:
114.Which RNA is synthesized in nucleolus?
Central Dogma
115.The central dogma of molecular biology describes the flow of genetic information are:
116.Translation converts the information in:
117.If a gene on a DNA strand has the sequence 5'-ATGC-3', the transcribed mRNA sequence will be:
- a 5'-TACG-3'
- b 5'-UACG-3'
- c 5'-ATGC-3'
- d 5'-AUCG-3'
118.The program in DNA that directs cellular activities is stored in:
119.Who in 1950, concluded that DNA is a fibrous substance in the form of helix?
- a Erwin Chargaff
- b Watson and Crick
- c Rosalind
- d Linus Pauling
Conjugated Molecules
120.Glycoproteins are formed by the linkage of:
- a Protein and lipid
- b Protein and carbohydrate
- c Two nucleic acids
- d RNA and histone
121.The conjugated molecules that are integral structural components of membranes of the cells are:
122.Which of the following are the basic structural framework of all types of plasma membranes?
123.Which class of biomolecules is formed by hydrophobic interactions:
124.The bond present between chromosomal DNA and proteins is:
125.The type of conjugated molecules involved in the regulation of gene expression are:
- a Nucleoproteins
- b Glycoprotein
- c Nucleosomes
- d Both (a) and (c)