on Q241) A major breakthrough in the studies of cells came with the development of electron microscope. This is because:

on Q242) Which of the following is not true about cilia and flagella?

on Q243) No membrane surrounds in this organelle.

on Q244) Which organelle possess hydrolase enzyme?

on Q245) (A) Cell is a structural and functional unit of living organisms. (R) New cells are not formed by cell division of preexisting cells.

on Q246) Which of the following is true regarding sap vacuole? (i) Acidic pH and hypertonic. (ii) Acidic pH and hypotonic. (iii) Alkaline pH and hypertonic. (iv) Alkaline pH and hypotonic. (v) Deposits more K+ and acetic acid.

on Q247) pH of vacuolar cell sap is:

on Q248) In bacteria, the gene responsible for conjugation is present in:

on Q249) Which of the following function is not done by cytoskeleton?

on Q250) How many of the following statements are true: (i) Telomerase is an enzyme which is a ribonucleoprotein. (ii) The non - sticky chromosomal ends are known as telomeres. (iii) Chromosome is a nucleoprotein structure. (iv) DNA is a homopolymer. (v) Every gene is a polynucleotide.

on Q251) Assertion: Pili are non motile appendages of bacteria. Reason: Pili do not take part in conjugation.

on Q252) Find out the mismatched pair:

on Q253) Which of the following is true regarding rough endoplasmic reticulum? (i) Consists of tubules and vesicles. (ii) Detoxification of toxic substances. (iii) Developed from nuclear membrane. (iv) More stable. (v) Ribophorins are present.

on Q254) Consider the following statements: (i) SER developed from RER. (ii) RER is more stable than SER. (iii) SER is responsible for protein synthesis. (iv) SER gives rise to Sphaerosomes.

on Q255) Cell wall shows:

on Q256) What is true statement regarding ribosomes?

on Q257) Mitochondria differ from chloroplast in having:

on Q258) Which of the following statement of a bacterial cell is/are correct? (i) Mesosome is formed by the extensions of plasma membrane into the cell. (ii) The pili are elongated tubular structures made up of a protein. (iii) Flagellum is composed of filament, hook and basal body. (iv) Ribosomes are about 30 nm by 50 nm in size.

on Q259) Park and Biggins receive credit for discovery of:

on Q260) Cytoskeleton is made of:

on Q261) Which of the following is true regarding plasma membrane in eukaryotes? (i) Selectively permeable. (ii) Glycerophospholipids are major phospholipids. (iii) Allow solvent and certain solutes. (iv) Presence of channels and pumps. (v) Semi permeable.

on Q262) The thickness of a unit membrane is:

on Q263) Consider the following statements: (i) With regarding to plasma membrane, glycoproteins acts as recognition site, the site for attachment and provide antigen specificity to cell membrane. (ii) Cholesterol provides both stability and fluidity to the cell membrane. (iii) Spectrin is an extrinsic protein found in the plasma membrane. (iv) Glycerophospholipids are the major phospholipids in the biological membrane.

on Q264) 80S type of ribosomes contains:

on Q265) Assertion: Transmembrane proteins penetrate the lipid layers. Reason: Extrinsic proteins are loosely bound to lipid layers.

on Q266) How many types of histone proteins are present in a eukaryotic cell?

on Q267 Match the following in Column I with Column II:

Column I	Column II
a. Primary wall	Phenolic compound
b. Secondary wall	Accretion
c. Plasmalemma	Intussusceptions
d. Lignin	PLLP.
- -  - -	Carbohydrates

on Q268) Assertion: Polytene chromosomes have high amount of DNA. Reason: Polytene chromosomes are formed by nuclear division without replication of DNA as Endomitosis.

on Q269) Bacterial flagellum consists of all the following components except:

on

Column I	Column II
Ribosomes	a. 1972
Nucleus	b. 1855
Omnis cellulae e cellulae	c. 1953
Fluid mosaic model	d. 1831

on Q272) The Endosymbiotic theory suggests that there are similarities between prokaryotes, mitochondria and chloroplast like:

on Q273) If the centromere is situated close to the end of a chromosome, it is called as:

on Q274) Select the correct statement from the following regarding cell membrane.

on Q275) How many of the following cell organelles are not present in prokaryotic cell? Endoplasmic reticulum, Nucleus, lysosomes, vacuoles, ribosomes, centrioles

on Q276) Which of the following is true about stroma except:

on Q277) Microfilaments are made up of

on Q278) What is the function of SER?

on Q279) (A) Ribosome is non-membrane organelles. (R)Ribosomes are the site of protein synthesis

on Q280) (A)The cytoplasm contain microbodies (R)The microbodies are not bound by membrane.

on Q281) Broken membrane of endoplasmic reticulum and golgi bodies are called:

on Q282) The fluidity of membranes in a plant in cold weather may be maintained by:

on Q283) Membranous extensions in blue green algae are known as:

on Q284) Match column-I with column-II and choose the correct option.

Column I(Chromosome)	Column II (Position of Centromere)
a. Metacentric	At the tip
b. Submetacentric	Almost near the tip
c. Acrocentric	At the middle
d. Telocentric	Slightly away from the middle

on Q285) Which of the following is not true for ribosomes?

on Q286) Which of the following is incorrect for Rudolf Virchow?

on Q287) Smallest component is:

on Q288) How many of the following statements are true regarding mesosomes? (i) Discovered by Fitz James. (ii) Mainly occurs in Gram -ve bacteria. (iii) They are involved in aerobic respiration, cell wall formation and DNA replication. (iv) Contains respiratory enzymes which help in anaerobiasis. (v) Functional equivalence of mitochondria and golgi bodies. (vi) Septal mesosomes are associated with nucleoid and are involved in DNA replication. (vii) Mainly two types are present.

on Q289) Identify the correct sequence of origin of plastids:

on Q290) Tonoplast is:

on Q291) Assertion: Plant cells make spindle fibres even though they do not have centromeres. Reason: Plant cells have microtubular organisation near nucleus.