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Online Biochemistry Test - Biochemistry Test 7

Instruction:
  • This is a FREE online test. Beware of scammers who ask for money to attend this test.
  • Total number of questions: 20.
  • Time allotted: 30 minutes.
  • Each question carries 1 mark; there are no negative marks.
  • DO NOT refresh the page.
  • All the best!

Marks : 2/20

Total number of questions
20
Number of answered questions
0
Number of unanswered questions
20
Test Review : View answers and explanation for this test.
1.
H2O and CH4 are both examples of
molecules
ions
acids
none of these
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Learn more problems on : Water, pH and Macromolecules
2.
The dissociation constant of H2O at 25° C is
10-14 M
1014 M
10-7 M
107 M
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Learn more problems on : Water, pH and Macromolecules
3.
A certain cell organelle which is made of a double phospholipid bilayer that has many large pores in it, is most likely
the nuclear envelope
the plasma membrane
the mitochondrion
the cytoskeleton
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Learn more problems on : Cell Structure and Compartments
4.
Which of the following statement is incorrect?
Hemoglobin and myoglobin are the two oxygen binding proteins
Hemoglobin transports O2 in the blood
Myoglobin stores O2 in muscles
None of the above
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Learn more problems on : Structure and Properties of Peptides
5.
In a fetus, where are lymphocytes produced?
In the spleen
In the bone marrow
In the liver
In the heart
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Learn more problems on : Immune System
6.
Which of these is a type of specific defense against pathogens?
Lymphocytes
Macrophages
Phagocytes
Leukocytes
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Learn more problems on : Immune System
7.
The humoral immune response relies on the production of soluble proteins called
antibodies
macromolecules
lymphocytes
none of these
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Learn more problems on : Anti Bodies
8.
What bands will be observed in a cesium chloride gradient after two rounds of replication?
One light, one medium and one heavy band
One light and one medium band
One medium band
One medium and one heavy band
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Learn more problems on : DNA Structure and Replication
9.
The transcriptional regulatory proteins in eukaryotes which induce transcription usually have
at least two distinct domains of protein structure, a DNA binding domain and an activation domain
at least two distinct domains of protein structure and a DNA binding domain
at least one distinct domains of protein structure, a DNA binding domain and an activation domain
none of these
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Learn more problems on : Transcription and Regulation
10.
The ribosomes are composed of
proteins
RNA
both (a) and (b)
lipids
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Learn more problems on : Protein Synthesis
11.
Translation in prokaryotes begins by the formation of a 30S initiation complex between the
30S ribosomal subunit, mRNA, initiation factors and N-fMet tRNA
30S ribosomal subunit, tRNA and initiation factors
30S ribosomal subunit and mRNA only
30S ribosomal subunit, mRNA and initiation factors
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Learn more problems on : Protein Synthesis
12.
The enzyme that joins DNA cuts is called
joinase
ligase
DNA phosphorylase
reverse transcriptase
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Learn more problems on : Protein and Nucleic Acid Interactions
13.
PCR amplifies millions of copies of
a short fragment of DNA
the entire genome (all the DNA in a sample)
both (a) and (b)
short chain RNA
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Learn more problems on : Polymerase Chain Reaction
14.
For gene transfer to be effective, transforming DNA must be
incorporated into the bacterial chromosome
incorporated into a viral genome
free in the bacterial cytoplasm
none of the above
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Learn more problems on : Polymerase Chain Reaction
15.
Lactic acid is produced by human muscles during strenuous exercise because of lack of
oxygen
NAD+
glucose
ADP and Pi
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Learn more problems on : Oxidative Phosphorylation
16.
Which of the following amino acid do not fall under the category of essential amino acid?
Histidine
Leucine
Glycine
Methionine
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Learn more problems on : Nitrogen Metabolism
17.
In scanning electron microscopy
a specimen is fixed and then coated with thin layer of a heavy metal
a specimen is fixed and then coated with transition metal
a specimen is not fixed and then coated with thin layer of a heavy metal
none of the above
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Learn more problems on : FT IR Spectroscopy
18.
A retention gap is placed between the injector and the front of the column to
retain contaminants and prevent them from reaching the column
retain the sample and release it gradually to the column
prevent backflush of the injected solution
all of the above
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Learn more problems on : Gas Chromatography
19.
Which of the following detectors give concentration-dependent signals?
Electron-capture detector
Thermal conductivity
Infra-red detector
All of these
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Learn more problems on : Gas Chromatography
20.
Replication in E. coli is initiated by the generation of short RNA primers using
RNA polymerase
primase
reverse transcriptase
both (a) and (b)
Your Answer: Option
(Not Answered)
Correct Answer: Option
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Learn more problems on : DNA Structure and Replication
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