201.  Production of sweat and sebum is related with
(A) skin
(B) liver
(C) lungs
(D) GIT

202. The evaporative cooling in the respiratory tract of dogs is called
(A) vasodilation
(B) vasoconstriction
(C) panting
(D) all of these

(A) bacteria
(B) fungi
(C) virus
(D) none of these

204. Most cell membranes are composed principally of
(A) DNA ad protein
(B) protein and lipids
(C) protein and chitin
(D) protein and RNA

205. Normally, in the process of osmosis, the net flow of water molecules into or out of the cell depends upon differences in the
(A) concentration of water molecules inside and outside the cell
(B) concentration of enzymes on either side of the cell membrane
(C) rate of molecular motion on either side of the cell membrane
(D) none of these

206.  Sodium ions are “pumped” from a region of lower concentration to a region of higher concentration in the nerve cells of humans. This process is an example of
(A) diffusion
(B) passive transport
(C) osmosis
(D) active transport

207. Proteins are made from amino acids by the process of
(A) hydrolysis
(B) pinocytosis
(C) dehydration synthesis
(D) active transport

208. Which is an organic compound found in most cells?
(A) water
(B) glucose
(C) oxygen
(D) sodium chloride

209.  Which are the four most abundant elements in living cells?
(A) carbon, oxygen, nitrogen, sulfur
(B) carbon, oxygen, hydrogen, nitrogen
(C) carbon, oxygen, sulfur, phosphorus
(D) carbon, sulfur, hydrogen, magnesium