General
✓✗Which of the following statements regarding mitochondria is incorrect?
- Enzymes of electron transport are embedded in the outer membrane.
- The inner membrane is convoluted with infoldings.
- The mitochondrial matrix contains a single circular DNA molecule and ribosomes.
- The outer membrane is permeable to monomers of carbohydrates, fats and proteins.
General
✓✗Small circular DNA molecules present outside the genomic DNA in many bacteria are called
- nucleoids
- episomes of the nucleus
- plasmids
- mesosomes
General
✓✗In the axoneme, the central sheath is connected to one of the tubules of each peripheral doublet by a
- radial spoke
- cisterna
- linker
- kinetochore
General
✓✗The movement of water by diffusion across a membrane is called
- active transport
- secretion
- phagocytosis
- osmosis
General
✓✗Which one of the following organelles is located near the nucleus and contains a collection of flattened membrane-bound cisternae?
- Golgi apparatus
- Nucleolus
- Centriole
- Mitochondrion
General
✓✗The number of Golgi cisternae in a stack
- is always fixed at 13
- is always nine
- is always two
- varies
General
✓✗Which of the following statements is not correct?
- The hydrolytic enzymes of lysosomes are active under acidic pH.
- Lysosomes have numerous hydrolytic enzymes.
- Lysosomes are membrane-bound structures.
- Lysosomes are formed by the process of packaging in the endoplasmic reticulum.
General
✓✗Ribosomes were discovered by
- Golgi
- de Robertis
- Porter
- Palade
General
✓✗A chromosome in which the centromere is slightly away from the middle, giving one shorter and one longer arm, is
- metacentric
- acrocentric
- sub-metacentric
- telocentric
General
✓✗The chlorophyll pigments of the chloroplast are present in the
- inner membrane only
- stroma
- thylakoids
- outer membrane
General
✓✗The organelles that are included in the endomembrane system are
- Golgi complex, endoplasmic reticulum, mitochondria and lysosomes
- endoplasmic reticulum, mitochondria, ribosomes and lysosomes
- Golgi complex, mitochondria, ribosomes and lysosomes
- endoplasmic reticulum, Golgi complex, lysosomes and vacuoles
General
✓✗Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Active transport requires energy.
Reason (R): In active transport, molecules move along their concentration gradient.
In the light of the above statements, choose the correct answer from the options given below.
Assertion (A): Active transport requires energy.
Reason (R): In active transport, molecules move along their concentration gradient.
In the light of the above statements, choose the correct answer from the options given below.
- (A) is true but (R) is false.
- (A) is false but (R) is true.
- Both (A) and (R) are true and (R) is the correct explanation of (A).
- Both (A) and (R) are true but (R) is not the correct explanation of (A).
General
✓✗The nuclear envelope, with its perinuclear space, forms a barrier between the materials
- of the cell wall and the plasma membrane
- of the two chromatids of each chromosome
- of the mitochondrial matrix and the stroma
- present inside the nucleus and those of the cytoplasm
General
✓✗Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Steroid-hormone-secreting animal cells have abundant smooth ER.
Reason (R): The smooth ER is the major site for synthesis of lipids.
In the light of the above statements, choose the correct answer from the options given below.
Assertion (A): Steroid-hormone-secreting animal cells have abundant smooth ER.
Reason (R): The smooth ER is the major site for synthesis of lipids.
In the light of the above statements, choose the correct answer from the options given below.
- (A) is true but (R) is false.
- (A) is false but (R) is true.
- Both (A) and (R) are true and (R) is the correct explanation of (A).
- Both (A) and (R) are true but (R) is not the correct explanation of (A).
General
✓✗Organisms composed of a single cell that is capable of independent existence are called
- organ systems
- unicellular organisms
- multicellular organisms
- colonial tissues