Cell The Unit of Life - Online Test
Q1. The plasma membrane consists mainly of
Answer : Option D
Explaination / Solution:
The plasma membrane is composed of lipids that are arranged in a bilayer. Also, the lipids are arranged within the membrane with the polar head towards the outer sides and the hydrophobic tails towards the inner part.
The membrane proteins can be classified as integral or peripheral. Peripheral proteins lie on the surface.
Q2. The nucleus was first described by
Answer : Option B
Explaination / Solution:
Nucleus as a cell organelle was first described by Robert Brown as early as 1831.
Q3. Lysosomes are produced by
Answer : Option D
Explaination / Solution:
Lysosomes are manufactured and budded into the cytoplasm by the Golgi apparatus with enzymes inside.
The enzymes that are within the lysosome are made in the rough endoplasmic reticulum, which are then delivered to the Golgi apparatus via transport vesicles.
Q4. The eukaryotic ribosomes are of
Answer : Option D
Explaination / Solution:
The eukaryotic ribosomes are 80S while the prokaryotic ribosomes are 70S. Here ‘S’ stands for the sedimentation coefficient; it indirectly is a measure of density and size.
Q5. The vacuoles are bound by the single membrane is called as
Answer : Option A
Explaination / Solution:
The vacuole is bound by a single membrane called tonoplast. In plant cells the vacuoles can occupy up to 90 per cent of the volume of the cell. In plants, the tonoplast facilitates the transport of a number of ions.
Q6. The chromosome having centromeres at one terminal end is called
Answer : Option A
Explaination / Solution:
A telocentric chromosome's centromere is located at the terminal end of the chromosome. Telomeres may extend from both ends of the chromosome.their shape is like i during anaphase. For example, the standard house mouse karyotype has only telocentric chromosomes.
Humans do not possess telocentric chromosomes
Q7. Nucleoplasm otherwise called as
Answer : Option A
Explaination / Solution:
The nuclear matrix or the nucleoplasm contains nucleolus and chromatin. The nucleoli are spherical structures present in the nucleoplasm.
Q8. Lysosomes are rich in hydrolytic enzymes such as
Answer : Option A
Explaination / Solution:
Lysosomes are found to be very rich in almost all types of hydrolytic enzymes (hydrolases – lipases, proteases, carbohydrases) optimally active at the acidic pH. These enzymes are capable of digesting carbohydrates, proteins, lipids and nucleic acids.
Q9. Mitochondria is called “Power house of the cell” because
Answer : Option B
Explaination / Solution:
Mitochondria is called as power house of the cell because it contain enzyme for cellular respiration in which energy is released in form of ATP.
Q10. The inner membrane of mitochondria thrown into folds to form finger like structure is called
Answer : Option B
Explaination / Solution:
Mitochondria are double membranous structure. The inner membrane of mitochondria thrown into folds to form finger-like structureis called cristae.
