Biology Test 258

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Biology Test 258

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Weekly Quiz Competition

Question 1
4 / -1

When normal cell has lost the usual control over its division, differentiation and apoptosis, its development and progress can usually be linked to

A
hybridomas

B
decreased metastasis

C
cell cycle regulators

D
increased contact inhibition

Solution

Cancer is most commonly classified a disease of uncontrolled cell division. Its development and progress can be linked to a series of changes in the activity of cell cycle regulators, e.g. cell cycle inhibitors stop the division process, if conditions are not right.
Question 2
4 / -1

In a living cell, various biomolecules are found in different compositions, the average composition of proteins is

A
70-90%

B
10-15%

C
50-60%

D
20-25%

Solution
Question 3
4 / -1

Which of the following does not take place during prophase-I of meiosis?

A
Chiasma formation

B
Terminalisation

C
Disjunction

D
Synapsis

Solution

Synapsis – Occurs in zygotene of prophase-I

Chiasma formation – Occurs in pachytene stage of prophase-I

Terminalisation – Occurs during the diakinesis of prophase-I

Disjunction – Occurs in anaphase-I, where migration of tetrads to opposite poles occurs.
Question 4
4 / -1

In which sub-stage of the meiosis bivalents are formed?

A
Leptotene

B
Zygotene

C
Diplotene

D
Pachytene

Solution

During zygotene of meiosis-I, the homologous chromosomes pair up and undergo synapses to form synaptonemal complex. Due to this pairing, chromosomes come together, get arranged side by side forming structures known as bivalents.
Question 5
4 / -1

During meiosis, in which stage enzyme recombinase is involved?

A
Prophase-I

B
Anaphase-I

C
Telophase

D
Metaphase-II

Solution

Recombinase enzyme is involved in the crossing over process occurring during pachytene stage of prophase-I. This enzyme helps in the recombination of genes between the homologous chromosomes.
Question 6
4 / -1

Some of the areas on the nuclear membrane are without ribosomes and appear to participate in

A
phosphorylation

B
cartilage breakdown

C
blebbing

D
photorespiration

Solution

The outer nuclear membrane is in continuity with endoplasmic reticulum. This outer membrane continuously produces numerous finger-shaped outgrowths, which explant into flat membranous sacs. This process is known as blebbing.
Question 7
4 / -1

Which one of the following organelles is known as the endoskeleton of the cell?

A
Golgi apparatus

B
Endoplasmic reticulum

C
Cell membrane

D
Cytoplasm

Solution

The endoskeleton of a cell is made up of endoplasmic reticulum. It is an extensive three-dimensional network of vascular system extending from nuclear membrane to plasma membrane. It provides stability and support to a cell.
Question 8
4 / -1

Which combination of light is most effective for photosynthesis?

A
Blue and green

B
Green and red

C
Yellow and green

D
Blue and red

Solution

Blue and red regions of the light spectrum are the most effective in photosynthesis.
Question 9
4 / -1

A proton gradient develops in the lumen of the thylakoid of chloroplast because

A
hydrogen ions are transported from stroma of chloroplast to thylakoid lumen

B
photolysis of water takes place in lumen of thylakoid

C
Both (a) and (b)

D
None of the above

Solution

A proton gradient develops in the lumen of the thylakoid of chloroplast because photolytic splitting of water occurs in it. As a result, the lumen of thylakoid becomes enriched with H+ ion. These H+ ions are transported from stroma of chloroplast to thylakoid membrane.
Question 10
4 / -1

The main features of phasic development theory of vernalisation include

A
the growth and development are two distinct phenomenons

B
new phase will come only when the preceding phase has been completed

C
vernalisation accelerates that phase of development which is dependent upon temperature

D
All of the above

Solution

All the given statements are true for phasic development theory of vernalisation.

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Biology Test 258

Result

Biology Test 258

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Rank

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SHARING IS CARING

Question 1

hybridomas

decreased metastasis

cell cycle regulators

increased contact inhibition

Solution

Question 2

70-90%

10-15%

50-60%

20-25%

Solution

Question 3

Chiasma formation

Terminalisation

Disjunction

Synapsis

Solution

Question 4

Leptotene

Zygotene

Diplotene

Pachytene

Solution

Question 5

Prophase-I

Anaphase-I

Telophase

Metaphase-II

Solution

Question 6

phosphorylation

cartilage breakdown

blebbing

photorespiration

Solution

Question 7

Golgi apparatus

Endoplasmic reticulum

Cell membrane

Cytoplasm

Solution

Question 8

Blue and green

Green and red

Yellow and green

Blue and red

Solution

Question 9

hydrogen ions are transported from stroma of chloroplast to thylakoid lumen

photolysis of water takes place in lumen of thylakoid

Both (a) and (b)

None of the above

Solution

Question 10

the growth and development are two distinct phenomenons

new phase will come only when the preceding phase has been completed

vernalisation accelerates that phase of development which is dependent upon temperature

All of the above

Solution

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