Chapter 8

Assertion: Lysosomes help in photorespiration. Reason: Lysosome have basic enzyme.

Assertion: Mitochondria is known as the power house of cell. Reason: ATP production takes place here.

Assertion: DNA is associated with proteins. Reason: DNA binds around histone protein that form a pool and the entire structure is called a nucleosome.

Assertion: Cell wall is not found in animal cell. Reason: Animal cells are covered by cell membrane.

Assertion: It is important that the organisms should have cell. Reason: A cell keeps its chemical composition steady within its boundary.

Assertion: A cell membrane shows fluid behaviour. Reason: A membrane is a mosaic or composite of diverse lipids and proteins.

Assertion: Cell is fundamental structural and functional unit of life. Reason: Anything less than a complete structure of a cell does not ensure independent life.

Assertion: \(\mathrm{Na}^{+} / \mathrm{K}^{+}\) pump is an active transport. Reason: \(\mathrm{Na}^{+} / \mathrm{K}^{+}\) pump utilize energy of ATP

Assertion: Calcium pectate is referred as plant cement. Reason: It glues neighbouring plant cells together.

Assertion: Lateral movement of protein lipid bilayer of plasma membrane is possible Reason: Lipid bilayer is of quasi fluid nature.

Assertion: Lysosomes posses' acidic pH. Reason: Lysosomes are rich in hydrolytic enzymes which are activated by acidic \(\mathrm{pH}\).

Assertion: Carbohydrate synthesis occurs in stroma of chloroplast. Reason: Enzyme required for carbohydrate synthesis present in stroma of chloroplast.

Assertion: Lysosomes have acidic \(\mathrm{pH}\). Reason: It is maintain by pumping proton into interior of lysosome.

Assertion: Mitochondria and chloroplast are semi-autonomous cell organelle. Reason: Both contain DNA, RNA and ribosome.

Assertion: Onicellular organisms are capable of independent existence. Reason: Single cell in these organisms can perform essential function of life.

Assertion: Cell is fundamental structural and functional unit of all living organisms. Reason: A complete structure of cell does not ensure independent life.

Assertion: Cells have different shapes Reason: Shapes of cells vary with function they perform

Assertion: Genetic material in prokaryotic is said to be naked. Reason: Genetic material in prokaryotic is not associated with histone proteins and absence of nuclear envelope around it.

Assertion: Certain bacteria possess resistance to antibiotic. Reason: Certain bacteria possess plasmid

Assertion: Mesosome in bacteria help in respiration Reason: Mesosome contain respiratory enzyme

Assertion: Polysomes are found in prokaryote as well as eukaryotes Reason: Polysomes use to produce more protein replica from single mRNA.

Assertion: Ribosomes are found in both prokaryote and eukaryotes. Reason: Ribosomes are protein factories which is required for both types of cells.

Assertion: In lipid bilayer in membrane, lipid are arranged with polar head towards outer side and the hydrophobic tail towards the inner part Reason: This ensures that the nonpolar tail of saturated hydrocarbon is protected from aqueous environment.

Assertion: Integral proteins can't be extracted easily from plasma membrane Reason: Integral proteins are partially or totally embedded in the membrane.

Assertion: RER is rough. Reason: This endoplasmic reticulum bears ribosomes.

Assertion: Golgi apparatus remain in close association with the endoplasmic reticulum. Reason: Material to be packaged in form of vesicle from the ER fuse with the cis face of the Golgi apparatus and move towards maturing face.

Assertion: Lysosomes are capable of digesting carbohydrate, protein, lipids and nucleic acids. Reason: Lysosomes contain almost all type of hydrolytic enzymes.

Assertion: Some ion concentration is higher in the vacuole than in the cytoplasm of plant cell. Reason: In the plant tonoplast facilitate the transport of some ions against concentration gradient into the vacuole.

Assertion: Chloroplast can synthesize proteins Reason: Chloroplast contains ribosomes.

Assertion: Ribosomes were discovered after discovery of electron microscope. Reason: Ribosomes can be observed by electron-microscope.