Online Biochemistry Test - Biochemistry Test 8

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Total number of questions: 20.
Time allotted: 30 minutes.
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A solution with pH = 5 is __________ than a solution with pH = 7.

2 times more basic

10 times more basic

10 times more acidic

100 times more acidic

[#]

Which of the following are responsible causing the diseases?

Pathogens

T cells

Lymphocytes

Macrophages

[#]

Which of the following is not the hydrophobic and aromatic amino acid?

Phenylalanine

Tyrosine

Tryptophan

None of these

[#]

Which of the following amino acids can form hydrogen bonds with their side (R) groups?

Asparagine

Aspartic acid

Glutamine

All of these

[#]

The E.coli pyruvic acid dehydrogenase complex is reported to

decatalyze the oxidation of pyruvic acid to acetyl Co A and CO₂

Catalyze the oxidation of pyruvic acid to acetyl Co A and CO₂

retard the reduction of pyruvic acid to acetyl Co A and CO₂

Catalyze the reduction of pyruvic acid to acetyl Co A and CO₂

[#]

β-Lymphocytes are often called simply

B cells

T cells

T Lymphocytes

none of these

[#]

Antibodies bound to an invading microorganism activate the complement system via

classical pathway

metabolic pathway

Embden Meyerhof pathway

Entner-Doudoroff pathway

[#]

Rocket Immunodiffusion is also known as

gel diffusion

electroimmunodiffusion

double-diffusion

none of these

[#]

Specific translocations are associated with

colon cancer

breast cancer

pancreatic cancer

some leukemias

[#]

10.

The major second messengers are

cAMP

cGMP

DAG

All of these

[#]

11.

Which of the following occur in the presence of glucose?

lac Z gene expression is increased

cAMP increases

Binding of CAP-cAMP complex to the promoter area decreases

none of the above

[#]

12.

When populations are small, gene frequencies can change from generation to generation and some alleles may become fixed in a population. This is called __________ .

assortative mating

inbreeding

heterosis

genetic drift

[#]

13.

A biological redox reaction always involves

an oxidizing agent

a gain of electrons

a reducing agent

all of these

[#]

14.

The cytochrome c oxidase complex

accepts electrons from cyt c

donates four electrons to O₂

pumps protons out of the matrix space

all of these

[#]

15.

A eukaryotic cell that can carry out only fermentation instead of the complete aerobic respiration of glucose

produces less CO₂

is lacking in O₂

has mitochondria present

all of these

[#]

16.

Which of the following is used as carbon atom source while producing urea in the urea cycle?

Arginine

Aspartic acid

Carbon dioxide

Glucose

[#]

17.

Manganese is a key component of all of the following enzymes except

arginase

pyruvate carboxylase

ceruloplasmin

Mn-superoxide dismutase

[#]

18.

Column bleeding occurs when

elution of the analyte is extended over time

the column is cracked and stationary phase leaks out

traces of the stationary phase are eluted

the column breaks during installation and causes personal injury

[#]

19.

Which of the following is an active site on its single polypeptide chain for DNA Polymerase I?

5' → 3' polymerase

3' → 5' exonuclease

5' → 3' exonuclease

all of the above

[#]

20.

Without telomerase, what would happen to the ends of chromosomes after each round of replication?

Chromosomes would become progressively shorter

Nothing would happen

Chromosomes would get longer

none of the above

[#]

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