8th Grade > Biology
CELL - STRUCTURE AND FUNCTION MCQs
Total Questions : 55
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Answer: Option D. -> phospholipids
:
D
∙The plasma membrane is composed mainly ofphospholipids. They are arranged in two layers, called aphospholipid bilayer. Each phospholipid molecule has a head and two tails. The head “loves”water(hydrophilic) and the tails “hate” water (hydrophobic).
∙ Thewater-hating tails are on the interior of the membrane, whereas the water-loving heads point outwards, toward either the cytoplasm or the fluid that surrounds the cell.
:
D
∙The plasma membrane is composed mainly ofphospholipids. They are arranged in two layers, called aphospholipid bilayer. Each phospholipid molecule has a head and two tails. The head “loves”water(hydrophilic) and the tails “hate” water (hydrophobic).
∙ Thewater-hating tails are on the interior of the membrane, whereas the water-loving heads point outwards, toward either the cytoplasm or the fluid that surrounds the cell.
Answer: Option A. -> Chlorophyll
:
A
Plants appear green due to the presence of a pigment called chlorophyll. There are high concentrations of chlorohyllin chloroplasts. These plastids are responsible for photosynthesis.
:
A
Plants appear green due to the presence of a pigment called chlorophyll. There are high concentrations of chlorohyllin chloroplasts. These plastids are responsible for photosynthesis.
Answer: Option B. -> Statement 3 is incorrect
:
B
Amoeba is a unicellular organism and can exist independently. It uses pseudopodia for locomotion and engulfing food. It can change its shape.
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B
Amoeba is a unicellular organism and can exist independently. It uses pseudopodia for locomotion and engulfing food. It can change its shape.
Answer: Option B. -> False
:
B
Extrachromosomal DNAis found outside thenucleusof acell. It is also referred to as an extra nuclear DNA orcytoplasmicDNA. The nuclearDNA which is also known as genomic DNAis responsible for almost all cellular functions. However, extrachromosomalDNA also serves important biological functions. Chloroplasts and mitochondria are cell organelles with extrachromosomal DNA.
:
B
Extrachromosomal DNAis found outside thenucleusof acell. It is also referred to as an extra nuclear DNA orcytoplasmicDNA. The nuclearDNA which is also known as genomic DNAis responsible for almost all cellular functions. However, extrachromosomalDNA also serves important biological functions. Chloroplasts and mitochondria are cell organelles with extrachromosomal DNA.
Answer: Option C. -> Hen's egg
:
C
Most of the cells are microscopic in size and are not visible to the unaided eye. They need to be enlarged or magnified by a microscope. Some cells are big enough to be seen with the unaided eye. Example of that is a hen’s egg which is considered as a single cell. It can be seen by the naked eye.
:
C
Most of the cells are microscopic in size and are not visible to the unaided eye. They need to be enlarged or magnified by a microscope. Some cells are big enough to be seen with the unaided eye. Example of that is a hen’s egg which is considered as a single cell. It can be seen by the naked eye.
Answer: Option A. -> Robert Hooke
:
A
Robert Hooke in 1665 observed thin slices of cork under a simple magnifying device. He observed box-like structures and named them cells. This is because these structures reminded him of the cells in a monastery.
:
A
Robert Hooke in 1665 observed thin slices of cork under a simple magnifying device. He observed box-like structures and named them cells. This is because these structures reminded him of the cells in a monastery.
:
Cells are highly organised in multicellular organisms. Not only is the rate of cell division controlled, but also the rate of cell death.If cells are no longer needed, they commit suicide by activating an intracellular death program. This process is therefore calledprogrammed cell death orapoptosis.
Answer: Option B. -> Lysosomes
:
B
Lysosomes are called "suicide bags" of the cellbecause they have hydrolytic enzymes stored in them. These enzymes are used to digest complex molecules in a cell. When released into the cytoplasm, these enzymes can "digest" or destroy thecell itself. Therefore, they are called "suicide bags.
:
B
Lysosomes are called "suicide bags" of the cellbecause they have hydrolytic enzymes stored in them. These enzymes are used to digest complex molecules in a cell. When released into the cytoplasm, these enzymes can "digest" or destroy thecell itself. Therefore, they are called "suicide bags.
Answer: Option A. -> Golgi apparatus
:
A
The Golgi apparatus isresponsible for the packaging, modification and transport of proteins. Proteins formed in the rough endoplasmic reticulum are packaged into vesicles and are transported to the golgi apparatus. Once the proteins reachthe golgi, they are modified and transported to their respective locations through vesicles. Hence golgi apparatus is known as the post office of the cell.
:
A
The Golgi apparatus isresponsible for the packaging, modification and transport of proteins. Proteins formed in the rough endoplasmic reticulum are packaged into vesicles and are transported to the golgi apparatus. Once the proteins reachthe golgi, they are modified and transported to their respective locations through vesicles. Hence golgi apparatus is known as the post office of the cell.