Question: 4
The structure of a protein with linear sequence of amino acids is called
A. Primary structure
B. Secondary structure
C. Tertiary structure
D. Quaternary structure
E. None of the above
Correct Answer: A. Primary structure
Explanation:
Proteins which have a linear sequence of amino acids in a polypeptide chain are primary structured
proteins that are held together by peptide or covalent bonds. Secondary structure is the folding of
primary sequence of amino acids into specific structures which are bound together by hydrogen
bonds. Three-dimensional structure of a protein molecule is the tertiary structure and the three-
dimensional structure and arrangement of more than one protein subunit is the quaternary structure.
Question: 5
The type of sex determination found in Crepidula fornicata is
A. Temperature dependent
B. Location dependent
C. Chromosome dependent
D. Water dependent
E. Soil dependent
Correct Answer: B. Location dependent
Explanation:
There are certain species of animals whose sex is determined by environmental factors rather than
the chromosomes. One such species is Crepidula fornicata in which location plays main role in
determining their sex. Temperature dependent sex determination is seen in reptiles such as
crocodiles and turtles.
Question: 6
Which of the following blood components carries dissolved nutrients?
A. Red blood cells
B. White blood cells
C. Platelets
D. Plasma
E. None of the above
Correct Answer: D. Plasma
Explanation:
Plasma is a straw-yellow colored fluid which constitutes 55% of blood. Plasma circulates dissolved
nutrients such as glucose, amino acids, fatty acids etc. and it removes the waste products of
metabolism. It is an aqueous solution consisting 90-93% of water.