1. Exposure of cells to X rays and gamma rays can cause which of the following?
ID: 137159 • Letter: 1
Question
1. Exposure of cells to X rays and gamma rays can cause which of the following?
Select all components that are part of the first line of defense:
a.lysozyme
b.defensins
c.C3 and C5
d.NOD
e.TLR
f.stomach pH
3.In an inducible operon, which of the following must occur to inhibit gene expression?
d.The inducer is absent.
Drug resistance spreads by______________.
4.Drug resistance spreads by______________.
5.Major histocompatibility complex proteins are
a.frameshift mutations b.base-pair substitutions c.physical breaks in chromosomes d.pyrimidine dimersExplanation / Answer
1. Correct answer:- (a) frameshift mutation
Explanation- It is defined as change in the reading frame of a gene (the triplet code).
-There are two types of frameshift mutations:
(i) insertion
(ii) deletion
2. Correct answers:-
(a) Lysozyme
(c) C3 and C5
(f) Stomach pH
Explanation- The first line of defence against infection are the surface barriers that prevent the entry of pathogenic substances.
E.g.- skin, mucous membranes, complement protein.
3. Correct answer:- (a) the repressor must bind to operator.
4. Correct answer:- (c) Both horizontal gene transfer and the growth of biofilms spread drug resistance.
5. Correct answer:-(b) not really antigens, but rather antibodies produced to mask foreign antigens.
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