General
✓✗The genetic material of a typical bacterium is
- a single circular DNA that is naked, not enveloped by a nuclear membrane
- many small DNA molecules inside a nucleolus
- several linear chromosomes inside a nuclear envelope
- single-stranded RNA bound to histones
General
✓✗Neutral solutes may move across the membrane by
- active transport against the gradient only
- phagocytosis only
- carrier proteins only, using ATP
- simple diffusion along the concentration gradient
General
✓✗Ribosomes are the centres for
- protein synthesis
- photosynthesis
- respiration
- fat synthesis
General
✓✗Which of the following processes uses carrier proteins and moves molecules against their concentration gradient?
- Simple diffusion
- Osmosis
- Active transport
- Passive diffusion of neutral solutes
General
✓✗In cyanobacteria, the membranous extensions into the cytoplasm that contain pigments are the
- chromatophores
- gas vacuoles
- thylakoids within chloroplasts
- mesosomes
General
✓✗Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): The primary function of the Golgi apparatus is to package the materials made by the endoplasmic reticulum and deliver them to intracellular targets and outside the cell.
Reason (R): Vesicles containing materials made by the endoplasmic reticulum fuse with the cis face of the Golgi apparatus, and the materials are modified and released from the trans face.
In the light of the above statements, choose the correct answer from the options given below.
Assertion (A): The primary function of the Golgi apparatus is to package the materials made by the endoplasmic reticulum and deliver them to intracellular targets and outside the cell.
Reason (R): Vesicles containing materials made by the endoplasmic reticulum fuse with the cis face of the Golgi apparatus, and the materials are modified and released from the trans face.
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
✓✗Select the alternative giving the correct identification and function of the organelle labelled 'A' in the diagram.
- Endoplasmic reticulum - synthesis of lipids
- Mitochondrion - produces cellular energy in the form of ATP
- Lysosome - secretes hydrolytic enzymes
- Golgi body - provides packaging material
General
✓✗Which of the following correctly describes the plasma membrane?
- It is a double membrane interrupted by many pores.
- It is a rigid, non-living layer made of cellulose.
- It is a quasi-fluid lipid bilayer with proteins and some carbohydrates.
- It is found only in plant cells, outside the wall.
General
✓✗Match List I with List II.
Choose the correct answer from the options given below.
| List I | List II |
| P. Simple diffusion | (i) Movement of water by diffusion |
| Q. Osmosis | (ii) Needed for transport of polar molecules |
| R. Active transport | (iii) Neutral solutes move along gradient |
| S. Carrier protein | (iv) Na+/K+ pump using ATP |
- P-(i), Q-(iii), R-(iv), S-(ii)
- P-(iii), Q-(i), R-(iv), S-(ii)
- P-(iv), Q-(i), R-(iii), S-(ii)
- P-(iii), Q-(i), R-(ii), S-(iv)
General
✓✗The structure that has nine peripheral triplet fibrils and no central microtubules is the
- centriole
- flagellum
- axoneme of sperm tail
- cilium
General
✓✗The structures formed by stacking of organised flattened membranous sacs in the chloroplasts are
- grana
- cristae
- stroma lamellae
- stroma
General
✓✗Ribosomes were first observed under the electron microscope as dense particles by
- Robert Brown
- Camillo Golgi
- Rudolf Virchow
- George Palade
General
✓✗Each centriole is made up of nine evenly spaced peripheral fibrils of tubulin protein, each of which is a
- singlet
- triplet
- doublet
- quadruplet
General
✓✗Which of the following organelles contain enzymes that have digestive action?
- Plastids
- Polysomes
- Ribosomes
- Lysosomes
General
✓✗The bacterial cell wall
- determines the shape of the cell and prevents it from bursting or collapsing
- is the site of protein synthesis in the bacterial cell
- forms the mesosomes that help in DNA replication
- is a living, selectively permeable layer around the cell