116. In sickle cell Haemoglobin, glutamic acid is replaced by
a. Valine
b. Alanine
c. Cytosine
d. Non of these
117. Carotenoids are of……Types
a. 2
b. 3
c. 4
d. 5
Feedback: Three of these carotenoids, namely α-carotene, β-carotene, and β-cryptoxanthin, can be converted into retinol and are thus referred to as provitamin A carotenoids. Lycopene, lutein, and zeaxanthin have no vitamin A activity and are thus referred to as non-provitamin A carotenoids.
118. Diameter of DN A
a. 1.8 nm
b.18 Ă…
c. 30 nm
d. Both A and BÂ
Feedback: The diameter of the helix is virtually constant over the entire length and equals 1.8 nm (18 Å).
119. Surplus amino acids in the body are broken down to form urea In
a. Stomach
b. Liver
c. Kidney
d. Heart
120. The Avery–MacLeod–McCarty experiment was an experimental demonstration, reported in ——– by Oswald Avery,
a. 1934
b. 1944
c. 1948
d. 1954
Feedback: The Avery–MacLeod–McCarty experiment was an experimental demonstration, reported in 1944 by Oswald Avery, Colin MacLeod, and Maclyn McCarty, that DNA is the substance that causes bacterial transformation, in an era when it had been widely believed that it was proteins that served the function of carrying genetic information (with the very word protein itself coined to indicate a belief that its function was primary).
121. Maltose are present in
a. Fruits
b. Milk
c. Sugarcane
d. All of these
122. Lactose are present in
a. Fruits
b. Milk
c. Sugarcane
d. None Of These
Feedback: Since lactose is only found in milk and foods made from milk, there is no lactose in fruits or vegetables.
123. Sucrose are present in
a. Fruits
b. Milk
c. Sugarcane
d. All Of These
124. Function of smooth endoplasmic reticulum
a. Lipid synthesis
b. Protein synthesis
c. Carbohydrate synthesis
d. None of these
Feedback: The smooth ER is involved in the synthesis of lipids, including cholesterol and phospholipids, which are used in the production of new cellular membrane. In certain cell types, smooth ER plays an important role in the synthesis of steroid hormones from cholesterol.
125. Maltose ..lactose and sucrose are
a. Monosaccharides
b. Disaccharides
c. Trisaccharide
d. Oligosaccharides
126. Monosaccharides are named which end with
a. asc
b. ose
c. ese
d. ate
127. Which one of the following is example of ketopentose
a. Ribulose
b. Fructose
c. Sedoheptulose
d. None Of These
Feedback: Examples of ketopentoses are ribulose and xylulose
128. The components of sucrose is
a. Glucose + Glucose
b. Glucose + Galactose
c. Glucose + Fructose
d. Fructose + fructose
Feedback: Sucrose (C12H22O11) is a disaccharide; hydrolysis, by the enzyme invertase, yields “invert sugar” (so called because the hydrolysis results in an inversion of the rotation of plane polarized light), a 50:50 mixture of fructose and glucose, its two constituent monosaccharides.
129. Types of proteins
a. 2
b. 4
c. 7
A. 8
Feedback: Proteins are macromolecules and have four different levels of structure – primary, secondary, tertiary and quaternary.
130. The structure of Haemoglobin is
a. Primary
b. Secondary
c. Tertiary
d. Quaternary
Feedback: At its simplest level, hemoglobin is made up of amino acids stuck together in chains. These chains are polypeptides that are also stuck to a heme molecule, which is where the oxygen will eventually stick.