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Biomolecules

Description: This test will help the students to revise the sense organs and various biomolecules of life thoroughly as it contains the questions fro these topics.
Number of Questions: 25
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Tags: proteins and carbohydrates Skin Receptors Sensory Reception and Processing Ears -Phonoreceptors Human Ear: Anatomy and Mechanism of Hearing Phonoreceptors Lipids Biomacromolecules
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In human beings, the layer of epidermis found only in palms and soles is

  1. stratum malpighi

  2. stratum spinosum

  3. stratum granulosum

  4. stratum lucidum

  5. stratum basale


Correct Option: D
Explanation:

Stratum lucidum is found only in palms and soles. The skin found in the palms and soles is known as thick skin because it has 5 epidermal layers instead of 4.

Which among the following statements does not characterise unsaturated fats?

  1. Double bonds may be in either a cis or a trans isomer.

  2. Unsaturated fats are popular with manufacturers of processed foods.

  3. Unsaturated chains have a lower melting point.

  4. Replacing saturated fats with unsaturated fats helps to lower levels of total cholesterol in human beings.

  5. Meat products contain both saturated and unsaturated fats.


Correct Option: B
Explanation:

Saturated fats are popular with manufacturers of processed foods because they are less vulnerable to rancidity and are in general, more solid at room temperature than unsaturated fats.

Which among the following fatty acids is capable of inhibiting the destruction of insulin secreting pancreatic beta cells in the human beings?

  1. Palmitoleic acid

  2. Propanoic acid

  3. Butyric acid

  4. Valeric acid

  5. Hexanoic acid


Correct Option: A
Explanation:

Palmitoleic acid is a common constituent of the glycerides of human adipose tissue. It is present in all tissues but, in general, found in higher concentrations in the liver. It has been shown to increase insulin sensitivity by suppressing inflammation, as well as inhibit the destruction of insulin-secreting pancreatic beta cells.

The cochlea is the auditory portion of the inner ear in the human beings. The apex of the cochlea is known as the

  1. scala vestibuli

  2. helicotrema

  3. scala tympani

  4. modiolus

  5. cochlear cupula


Correct Option: E
Explanation:

The cochlear cupula is a structure in the cochlea. It is the apex of the cochlea. The bony canal of the cochlea takes two and three-quarter turns around the modiolus.

In a human ear, which of the following is/are considered as a collection of supporting cells for the organ of Corti?

  1. Cladius cells

  2. Boettcher cells

  3. Umbo

  4. Stapedius

  5. Carotid canal


Correct Option: B
Explanation:

Boettcher cells are polyhedral cells on the basilar membrane of the cochlea, and are located beneath Claudius cells. Boettcher cells are considered supporting cells for the organ of Corti, and are present only in the lower turn of the cochlea. These cells interweave with each other and project microvilli into the intercellular space.

Which of the following amino acids is responsible for strengthening the immune system with a positive influence on the male libido?

  1. Arginine

  2. Carnitine

  3. Methionine

  4. Ornithine

  5. Taurine


Correct Option: A
Explanation:

Arginine, or L-arginine as it is called with its L-structure, is a semi-essential amino acid. Arginine is involved in many metabolic processes and is important in the treatment of heart diseases and high blood pressure. Arginine improves the circulation, strengthens the immune system and has a positive influence on male libido.

The pigment present in the fat cells of dermis in the human skin is

  1. melanoid

  2. melanin

  3. carotene

  4. oxyhaemoglobin

  5. haemoglobin


Correct Option: C
Explanation:

This pigment is yellow to orange in colour. It is present in the stratum corneum and fat cells of dermis and superficial fascia.

Myoglobin is a protein found in the heart and skeletal muscles of the body. It belongs to the group of

  1. phosphoproteins

  2. glycoproteins

  3. lipoproteins

  4. nucleoproteins

  5. chromoproteins


Correct Option: E
Explanation:

These are proteins that are coupled with a coloured pigment such as myoglubin, hemocyanin, cytochromes, flavoproteins etc.

Which among the following lipids act as an antioxidant and as a precursor of vitamin A in humans?

  1. Glycerophospholipids

  2. Sterol lipids

  3. Prenol lipids

  4. Glycerolipids

  5. Sphingolipids


Correct Option: C
Explanation:

Prenol lipids are synthesised from the five-carbon-unit precursors isopentenyl diphosphate and dimethylallyl diphosphate. 

Which among the following is a non-reducing sugar?

  1. Sucrose

  2. Maltose

  3. Glucose

  4. Galactose

  5. Lactose


Correct Option: A
Explanation:

Sucrose is a molecule with nine stereocentres and many sites that are reactive or can be reactive. 

Which of the following statements regarding the nasal cavity in human beings is false?

  1. The nasal cavity conditions the air to be received by the other areas of the respiratory tract.

  2. The nasal cavity is a large air filled space.

  3. The nasal cavity is enclosed by the maxilla.

  4. The floor of the nasal cavity is made up by the bones of the hard palate.

  5. The cilia move the mucus down the nasal cavity to the pharynx.


Correct Option: C
Explanation:

Lateral wall of the nasal cavity is mainly made up by the maxilla, however there is a deficiency that is compensated by: the perpendicular plate of the palatine bone, the medial pterygoid plate, the labyrinth of the ethmoid and the inferior concha. The nasal cavity is enclosed by the nasal bone.

Breast milk is the primary source of nutrition for newborns before they are able to eat and digest other foods. The fatty acid present in human breast milk is

  1. α-linolenic acid

  2. dihomo-γ-linolenic acid

  3. eicosapentaenoic acid

  4. linoleic acid

  5. gamma-linolenic acid


Correct Option: C
Explanation:

Eicosapentaenoic acid is an omega-3 fatty acid. It is obtained in the human diet by eating oily fish or fish oil, e.g. cod liver, herring, mackerel, salmon, menhaden and sardine and various types of edible seaweed. It is also found in the human breast milk.

Omega 7 fatty acids are generally quite rare and are considered as a natural and healthy form of trans-fats. An omega-7 trans fat found in the dairy products is

  1. nervonic acid

  2. punicic acid

  3. oleic acid

  4. α-Parinaric acid

  5. rumenic acid


Correct Option: E
Explanation:

Rumenic acid is a conjugated linoleic acid found in the fat of ruminants and in dairy products. It is an omega-7 trans fat.

The hard and translucent portion of the nail is the

  1. nail matrix

  2. nail plate

  3. eponychium

  4. paronychium

  5. perionyx


Correct Option: B
Explanation:

The nail plate is the hard and translucent portion of the nail, composed of keratin.

__________ determines the shape of the human body.

  1. Panniculus

  2. Panniculus carnosus

  3. Panniculus adiposus

  4. Stratum membranosum

  5. Superficial fascia


Correct Option: E
Explanation:

 It is a loose areolar connective tissue and adipose. It is the layer that primarily determines the shape of the human body.

The lipids most commonly used in anti-microbial and anti-cancer agents are

  1. phospholipids

  2. steroids

  3. waxes

  4. saccharolipids

  5. polyketides


Correct Option: E
Explanation:

Polyketides are synthesised by polymerisation of acetyl and propionyl subunits by classic enzymes as well as iterative and multimodular enzymes that share mechanistic features with the fatty acid synthases. Many commonly used anti-microbial, anti-parasitic and anti-cancer agents are polyketides.

________ are frequently referred to as bad lipoproteins.

  1. High-density lipoproteins

  2. Low-density lipoproteins

  3. Intermediate-density lipoproteins

  4. Chylomicrons

  5. Very low density lipoproteins


Correct Option: B
Explanation:

LDL particles are sometimes referred to as bad lipoproteins because they correlate with atherosclerosis progression.

The fatty acid used as an additive in cigarettes is

  1. heptanoic acid

  2. caprylic acid

  3. nonanoic acid

  4. lauric acid

  5. tridecylic acid


Correct Option: A
Explanation:

Heptanoic acid is used to esterify steroids in the preparation of drugs such as testosterone enanthate, trenbolone enanthate, drostanolone enanthate and methenolone enanthate (Primobolan). It is also one of many additives in cigarettes.

Protein structure is the biomolecular structure of a protein molecule. Which of the following statments regarding the tertiary structure of proteins is incorrect?

  1. Hydrophobic interactions also contribute to the tertiary structure.

  2. Hydrogen bonds are also present in the tertiary structure of proteins.

  3. Electrostatic interactions are present between charged amino acid chains.

  4. The folding of the polypeptide chain is stabilised by strong, non-covalent interactions.

  5. The linear sequence of polypeptide chain is folded into compact globular structure.


Correct Option: D
Explanation:

The folding of the polypeptide chain is stabilised by weak, non-covalent interactions.

The fatty acid obtained from the cyanobacterium Spirulina is

  1. paullinic acid

  2. lignoceric acid

  3. α-linolenic acid

  4. stearidonic acid

  5. gamma-linolenic acid


Correct Option: D
Explanation:

Stearidonic acid is a ω-3 fatty acid, sometimes called moroctic acid. It is biosynthesised from alpha-linolenic acid by the enzyme delta-6-desaturase. Natural sources of this fatty acid are the seed oils of hemp, blackcurrant, corn gromwell and echium, and the cyanobacterium Spirulina.

Which of the following is not a function of the epidermis?

  1. It provides a physical barrier.

  2. It provides a chemical barrier.

  3. It provides colour to the skin.

  4. It provides a barrier for trans-epidermal water loss.

  5. It plays a primordial role in thermoregulation.


Correct Option: E
Explanation:

 It plays a primordial role in thermoregulation and in healing.

Casein and collagen are examples of

  1. scleroproteins

  2. globulins

  3. albumins

  4. metalloproteins

  5. protamines


Correct Option: D
Explanation:

These proteins are linked with various metals. Examples: casein, collagen, ceruloplasmin, etc.

Which among the following amino acids inhibits the growth of hair and nails in the body?

  1. Asparagine

  2. Cystine

  3. Cysteine

  4. Glycine

  5. Glutamine


Correct Option: C
Explanation:

It provides resistance to our body and inhibits the growth of hair, nails etc.

A small pink coloured globular nodule present at the inner corner of the human eye is

  1. lacrimal canaliculi

  2. lacrimal sac

  3. nasolacrimal duct

  4. caruncula lacrimalis

  5. lacrimal lake


Correct Option: D
Explanation:

The caruncula lacrimalis is the small, pink globular nodule at the inner corner (the medial angle) of the eye. It is made of skin covering sebaceous (oil) and sudoriferous (sweat) glands.

Which of the following statements is incorrect regarding triglycerides?

  1. In triglyceride form, lipids can be absorbed by the jejunum.

  2. The process of lipolysis takes place in the intestine.

  3. Triglycerides form chylomicrons.

  4. Liver cells can synthesise and store triglycerides.

  5. Human brain cannot utilise fatty acids as an energy source.


Correct Option: A
Explanation:

The pancreatic lipase acts at the ester bond, hydrolysing the bond and releasing fatty acid.

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