Online Biochemistry Test - Biochemistry Test 10

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.
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1.

Where in a eukaryotic cell, DNA can be found?

Nucleus

Mitochondrion

Vacuole

Both (a) and (b)

[#]

2.

The different orders of protein structure are determined by all of the following bond types except

peptide bonds

phospho-diester bonds

disulfide bridges

hydrogen bonds

[#]

3.

In a native PAGE, proteins are separated on the basis of

net negative charge

net charge and size

net positive charges size

net positive charge

[#]

4.

The role of Asp 102 and His 57 during trypsin catalysis is to

neutralize the charge on the other's side chain

keep the specificity pocket open

function as a proton shuttle

clamp the substrate into the active site

[#]

5.

What is the result of an abnormal response of the immune system to part of a person's own body?

Passive immunity

Cancer

An allergic response

An autoimmune disease

[#]

6.

A monoclonal antibody (mAb) specific for the 2,4-dinitrophenyl (DNP) hapten might also bind

Leu or Ileu

His or Pro

Tyr or Phe

Ser or Thr

[#]

7.

Exocytosis is the secretion of proteins

out of the cell across the plasma membrane into the extracellular space

out of the cell across the plasma membrane into the intracellular space

is the uptake of macromolecules from the extracellular space into the cell across the plasma membrane

is the uptake of macromolecules from the intracellular space into the cell across the plasma membrane

[#]

8.

The membrane proteins that catalyze active transport reactions differ from soluble enzymes as

they are permanently changed during the reaction

the substrates of the reaction are all outside the cell

they do not enhance the rates of reaction

the products of the reaction move in a specific direction

[#]

9.

Which of the following statement is incorrect?

The principal lipophilic hormones that binds to receptors located in the plasma membranes are prostaglandins

Prostaglandins are synthesized from arachidonic acid

Prostaglandins act as paracrine signaling molecules

None of the above

[#]

10.

Which of the following would not contain DNA?

Yeast

Bacteria

Glass crystals

Mold

[#]

11.

Sex hormones activate transcription of specific genes by

binding to a transcription factor

binding to RNA polymerase

binding to DNA enhancer region

binding to DNA promoter region

[#]

12.

Hexokinase activity in glycolysis is inhibited by

glucose 6- phosphate

fructose 6-phosphate

fructose 1,6 biphosphate

phosphofructokinase

[#]

13.

Saliva contains all of the following except

hormones

amylase

bacteria-killing enzymes

antibodies

[#]

14.

Synthesis of fatty acid takes place when

fatty acid are plentiful

carbohydrate is plentiful

carbohydrate and energy are plentiful

none of these

[#]

15.

How many classes of steroid hormones are there?

3

2

4

5

[#]

16.

The followings are the products of the light reactions of photosynthesis except

ATP

oxygen

NADPH

glucose

[#]

17.

Tyrosine is degraded to acetoacetyl CoA and fumarate and is described as a

glucogenic amino acid

ketogenic amino acid

ketogenic and glucogenic amino acid

keto-gluco amino acid

[#]

18.

Why phosphorescence measurements are usually made at a low temperature?

To prevent thermal degradation of the phosphorescent species

To promote phosphorescence by slowing the rate of radiationless transfer processes

To increase the efficiency of the detector

To decease the efficiency of detector

[#]

19.

Thin layer chromatography is

partition chromatography

electrical mobility of ionic species

adsorption chromatography

none of the above

[#]

20.

The process not involved in the formation of glucose by gluconeo-genesis is

the conversion of oxaloacetate to glucose

the conversion of lactate to pyruvate

the dephosphorylation of glucose-6-phosphate

all of the above

[#]

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