Biology Test 222

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Biology Test 222

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Weekly Quiz Competition

Question 1
4 / -1

Lampbrush chromosomes found in the oocytes of amphibians are seen in

A
Leptotene

B
Diplotene

C
Pachytene

D
None of these

Solution

Lampbrush chromosomes are a special form of chromosome found in the growing oocytes (immature eggs) of most animals, except mammals. They were first described by Walther Flemming in 1882. Lampbrush chromosomes of tailed and tailless amphibians, birds and insects are described best of all.
Question 2
4 / -1

Which is the CORRECT order of phases ?

A
Leptotene, diakinesis, pachytene, diplotene, zygotene

B
Leptotene, zygotene, pachytene, diplotene, diakinesis

C
Diakinesis, diplotene, pachytene, zygotene, leptotene

D
Leptotene, pachytene, zygotene, diplotene, diakinesis

Solution

Prophase I is divided into five sub-phases: leptotene, zygotene, pachytene, diplotene and diakinesis. Another sub-phase called preleptonema is sometimes recognized prior to leptonema.
Question 3
4 / -1

Nucleoproteins are synthesised in

A
Nucleoplasm

B
Nuclear envelope

C
Nucleolus

D
Cytoplasm

Solution

Nucleoproteins are the conjugated proteins. These include ribonucleoproteins and occur in ribosomes. Deoxyribonucleoproteins occur in chromosomes.All proteins are formed in cytoplasm
Question 4
4 / -1

Triglycerides on hydrolysis yield

A
3 fatty acids & 1 glycerol

B
1 fatty acids & 3 glycerol

C
All fatty acids

D
All glycerol.

Solution

Triglycerides (fats) can be hydrolyzed to produce glycerol and 3 fatty acids in the presence of acid and heat or with a suitable lipase enzyme under biological conditions.
Question 5
4 / -1

An acidic amino acid is

A
Lysine

B
Glutamate

C
Aspartate

D
Both 2 and 3

Solution

Aspartic acid and glutamic acid are amino acids that have an additional carboxyl group that can release a proton and acquire a negative charge at the pH of body fluids.
Question 6
4 / -1

Haemoglobin has

A
Primary structure

B
Secondary structure

C
Tertiary structure

D
Quaternary structure

Solution

The structure for hemoglobin is very similar to myoglobin except that it has a quaternary structure due to the presence of four protein chain subunits.Each protein chain subunit contains a heme group with the iron attached. Each hemoglobin molecule can bind to a total of four oxygen molecules.
Question 7
4 / -1

The end product glucose -6- phosphate causes _________ of allosteric enzymes hexokinase.

A
Allosteric inhibition

B
Competitive inhibition

C
Feedback inhibition

D
Both 1 and 3

Solution

It inhibits hexokinase from allosteric site and this process is known as competitive inhibition.
Question 8
4 / -1

The ovary is half inferior in flowers of

A
Guava

B
Peach

C
Cucumber

D
Cotton

Solution

The ovary here is said to be half inferior, i.e, plum rose, peach, etc. If gynoecium is situated in the centre and other parts of the flowers are located on the rim of the thalamus almost at the same level, it is called perigynous. The ovary here is said to be half inferior, i.e, plum rose, peach, etc.
Question 9
4 / -1

Mycolic acid occurs in the wall of

A
Eubacteria

B
Actinomycetes

C
Archaebacteria

D
Blue green algae

Solution

mycolic acids are found in the wall of mycobacterium tuberculosis , Mycobacterium leprae and rhodococcus(Actinomycetes)
Question 10
4 / -1

The number of fatty acids present in a molecule of phospholipid is

A
Two

B
Three

C
One

D
None

Solution

The structure of the phospholipid molecule generally consists of two hydrophobic fatty acid "tails" and a hydrophilic "head" consisting of a phosphate group. The two components are joined together by a glycerol molecule.

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Biology Test 222

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Biology Test 222

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Question 1

Leptotene

Diplotene

Pachytene

None of these

Solution

Question 2

Leptotene, diakinesis, pachytene, diplotene, zygotene

Leptotene, zygotene, pachytene, diplotene, diakinesis

Diakinesis, diplotene, pachytene, zygotene, leptotene

Leptotene, pachytene, zygotene, diplotene, diakinesis

Solution

Question 3

Nucleoplasm

Nuclear envelope

Nucleolus

Cytoplasm

Solution

Question 4

3 fatty acids & 1 glycerol

1 fatty acids & 3 glycerol

All fatty acids

All glycerol.

Solution

Question 5

Lysine

Glutamate

Aspartate

Both 2 and 3

Solution

Question 6

Primary structure

Secondary structure

Tertiary structure

Quaternary structure

Solution

Question 7

Allosteric inhibition

Competitive inhibition

Feedback inhibition

Both 1 and 3

Solution

Question 8

Guava

Peach

Cucumber

Cotton

Solution

Question 9

Eubacteria

Actinomycetes

Archaebacteria

Blue green algae

Solution

Question 10

Two

Three

One

None

Solution

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