Frequently Asked Questions
The cytoskeleton is made up of
A: Cellulose microfibrils
B: Proteinaceous filaments
C: Calcium carbonate granules
D: Callose deposits
Solution:
Correct Option is: (B) Proteinaceous filaments
Explanation
- Microtubules, actin filaments, and intermediate filaments make up a cell's cytoskeleton. These structures give the cell its shape and aid in the organisation of its components.
- They also serve as a basis for cell division and motility. Cytoskeletal structures are fibrous or small tubular structures that act as supporting structures for cells. In 1928, Koltzoff coined the term "cytoskeleton."
- Cytoskeletal structures are classified into three categories. Intermediate fibres include microtubules, microfilaments, and intermediate fibres. They are made up of proteins like tubulin, actin, desmin, and myosin, among others.
In humans, urea is formed in
A: ureter
B: liver
C: spleen
D: kidney
Solution:
Correct Option is: (B) Liver
Explanation
The ornithine cycle is responsible for the synthesis of urea in the liver.
As a result, the right answer is 'liver.'
The breakdown of amino acids produces ammonium ions. Some of them are involved in the production of nitrogen compounds.
What is diapedesis
A: A kind of amoeboid movement
B: Process of coming out of WBC through the capillary wall to fight against foreign microorganisms
C: A type of locomotion found in hydra
D: The process of filtration of urea in kidney
Solution:
Explanation:
Diapedesis is the process by which white blood cells leak from blood arteries into the surrounding environment in the event of an injury/infection.
Correct Option is: (B) the Process of coming out of WBC through the capillary wall to fight against foreign microorganisms
A prokaryotic cell lacks
A: True nucleus
B: Nuclear membrane
C: Membrane bound organelles
D: All of the above
Solution:
Correct Option is: (D) All of the above
Explanation
Prokaryotes lack a distinct nucleus (where DNA and RNA are kept in eukaryotic cells), mitochondria, the endoplasmic reticulum (ER), the Golgi apparatus, and other membrane-bound organelles. Prokaryotic cells, in addition to lacking organelles, lack a cytoskeleton.
Animal starch is known as
Solution:
Explanation :-
Animals store glucose in the form of glycogen.
Plants store glucose in the form of starch.
Therefore, glycogen is known as animal starch, because its structure is very similar to amylopectin (starch found in plants).
Final answer :-
The correct answer is glycogen.
