Solved CSIR Life sciece cell biology questions Part 4

81. Procollagen consists of _______ and is formed in the lumen of the:
(a) 2 b sheets, lysosomes
(b) 3 b sheets, E R
(c) 3 a chains, Golgi
(d) 3 a chains, E R

82. The flexibility of the lungs is due mainly to:
(a) laminins (c) elastins
(b) collagens (d) fibronectins

83. A difference between collagen and elastin is that:
(a) elastin has hydroxylysines and collagen does not
(b) collagen does not have hydroxylated proline residues
(c) there are over 15 types of elastins and less than 5 types of collagens
(d) elastin molecules are crosslinked by covalent bonds between lysine residues,
and collagen is not

84. Which is the correct order from least to most complex?
(a) Glucuronate, hyaluronate, proteoglycans, GAG
(b) Hyaluronate, glucuronate, GAG chains, proteoglycans
(c) GAG chains, hyaluronate, glucuronate, proteoglycans
(d) Glucuronate, hyaluronate, GAG chains, proteoglycans

85. Two of the most common adhesive glycoproteins in the ECM are:
(a) laminins and elastins
(b) collagens and elastins
(c) fibronectins and laminins
(d) collagens and fibronectins

86. Fibronectins have an effect on:
(a) blood clotting (b) cell shape
(c) cell movement (d) all of the above

87. The most abundant glycoproteins in the basal lamina are ______
(a) collagens (b) entactin
(c) laminins (d) fibronectins

88. The most abundant protein in human body is-
(a) Collagen (b) Fibronectin
(c) Globin (d) albumin

89. Roles of the glycocalyx include:
(a) cell adhesion (b) cell recognition
(c) creation of permeability barriers (d) all of the above

90. A red blood cell has just been targeted for destruction. This cell:
(a) has an increase in sialic acid groups.
(b) has a decrease in sialic acid groups
(c) has exposed galactose residues
(d) B and C