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Vacuoles and Acrosomes (AIPVT)

Description: Proteins
Number of Questions: 15
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Tags: Vacuoles Acrosomes
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Which is the extra function of vacuoles in protists?

  1. Waste management

  2. Storage of food

  3. Exporting unwanted substances

  4. Isolating harmful materials


Correct Option: B
Explanation:

In protists, vacuoles have the additional function of storing food which has been absorbed by the organism.

In which of the following organisms are gas vacuoles found?

  1. Sulfur bacteria

  2. Cyanobacteria

  3. Amoeba

  4. Mycobacteria


Correct Option: B
Explanation:

Gas vacuoles, which are freely permeable to gas are present in some species of Cyanobacteria. They allow the bacteria to control their buoyancy.

What are modified vacuoles in germinating seeds called?

  1. Carboxysomes

  2. Cytoplasmic inclusions

  3. Protein bodies

  4. Vesicles


Correct Option: C
Explanation:

The modified vacuoles in germinating seeds are called protein bodies. It stores proteins needed for germination.

Under which of the following conditions is allicin in garlic formed?

  1. Vacuoles exert more pressure on the wall.

  2. Vacuole is broken.

  3. Transporation of K+ ions

  4. Aquaporins degradation


Correct Option: B
Explanation:

In garlic, alliin and the enzyme alliinase are normally separated, but they form allicin if the vacuole is broken.

Which of the following bacteria have vacuoles?

  1. Neisseria

  2. Methanococcus

  3. Nitrosomonas

  4. Thioploca


Correct Option: D
Explanation:

Thioploca is a genus of filamentous sulfur bacteria, which contain large vacuoles. The cytosol is extremely reduced in this genera and the vacuole can occupy between 40–98% of the cell. The vacuole contains high concentration of nitrate ions.

Though vacuole is a specialised vesicle, yet it differs from vesicle because of its

  1. bi-polar lipid membrane structure

  2. storage organelle

  3. size being larger

  4. endocytosis involvement


Correct Option: C
Explanation:

Vacuoles are larger in size as compared to vesicles.

In which of the following cells is a prominent large central vacuole found?

  1. Plant cell

  2. Animal cell

  3. Bacterial cell

  4. Fungal cell


Correct Option: A
Explanation:

A prominent central vacuole is found in plant cells. It occupies 80-90% of cell volume. The main role of the central vacuole is to maintain turgor pressure against the cell wall.

Which antioxidant accounts for highest antioxidant activity of the tonoplast?

  1. Vitamin A

  2. Vitamin C

  3. Vitamin E

  4. Carotenoids


Correct Option: C
Explanation:

Vitamin E, i.e. alpha tocopherol accounts for a high antioxidant activity of the membrane (tonoplast).

Which organelle gives rise to acrosomes?

  1. Endoplasmic reticulum

  2. Golgi apparatus

  3. Vacuole

  4. Lysosome


Correct Option: B
Explanation:

Acrosome is derived from Golgi apparatus.

Which is the largest organelle of a plant cell?

  1. Nucleus

  2. Vacuole

  3. Plastid

  4. Mitochondria


Correct Option: B
Explanation:

The largest organelle of a plant cell is vacuole. It covers 80-90% of the volume of a plant cell.

Which chemical produces tears when vacuoles of onion are broken?

  1. 1-propenesulfenic acid

  2. Syn-propanethial-S-oxide

  3. Ellagic acid

  4. Theaflavin-3-gallate


Correct Option: B
Explanation:

Syn-propanethial-S-oxide is formed by the action of lachrymatory factor synthase (LFS) on 1-propensulfenic acid and produces tears in eyes.

Which enzyme present in acrosomes dissolves the intercellular matrix between the cumulus cells?

  1. Acrosin

  2. Hyaluronidase

  3. Phospholipase

  4. Beta-N-acetylglucosaminidase


Correct Option: B
Explanation:

The hyaluronidase enzyme dissolves the intercellular matrix between the cumulus cells.

Which of the following male infertilities is caused if golgi apparatus does not turn into an acrosome?

  1. Azoospermia

  2. Globozoospermia

  3. Teratozoospermia

  4. Necrozoospermia


Correct Option: B
Explanation:

Globozoospermia is caused when golgi apparatus is not transformed into acrosome, which is needed for fertilisation; sperms are with round heads.

What is tonoplast?

  1. Storage vacuole

  2. Vacuolar fluid

  3. Chloroplast in plant vacuoles

  4. Vacuolar membrabne


Correct Option: D
Explanation:

Tonoplast is the membrane of vacuole. It is the cytoplasmic membrane surrounding a vacuole, separating the vacuolar contents from the cell's cytoplasm.

In which of the following cases does the vacuolar interior becomes more acidic?

  1. Protons are transported from vacuole to the cytosol.

  2. Protons are transported from the cytosol to the vacuole.

  3. Electrons are transported from the cytosol to the vacuole.

  4. Electrons are transported from the vacuole to the cytosol.


Correct Option: B
Explanation:

When protons are transported from the cytosol to the vacuole, it stabilises cytoplasmic pH and makes the vacuolar interior more acidic.

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