Solution: Primary constriction present in a chromosome is called the centromere. Centromere holds two chromatids of a chromosome. Based on the position of the centromere, the chromosomes can be...
(i) Nucleus (ii) Centrosome Solution: i) The nucleus is a double-membraned structure with an oval or spherical shape that contains the genetic material. The nuclear envelope, nuclear matrix,...
Solution: The endomembrane is an intercellular structure that allows materials to pass from one area to another via vesicles. Vacuoles, plasma membrane, endoplasmic reticulum, lysosomes, and the...
Solution: The nuclear membrane is bordered by minute pores termed nuclear pores, which are generated by the fusing of two membranes. It's just a few perforations in the nuclear envelope. Functions:...
Solution: Organ systems are made up of organs in every plant and animal cell, and organ systems are built up of organs. Tissues make up organs, and tissues are made up of a cluster of cells. Cells...
Solution: Organs and organ systems are made up of tissues made up of cells. A cell is a self-contained structure that can perform functions on its own. As a result, for enhanced efficiency and...
Solution: • The nuclear membrane is missing, and there is no envelope around the genetic material. • They lack membrane-bound organelles and membrane-bound nucleus • Cell lumen is filled with a...
Solution: Two organelles that are double membrane-bound are i) Mitochondria ii) Chloroplasts Characteristics of mitochondria The mitochondrion is a double membrane-bound structure, with the outer...
Solution: A mesosome is a membranous structure generated by plasma membrane expansions within the cell. It is known as septal mesosome if it is found linked to the nucleoid, and lateral mesosome if...
(a) Cells of all living organisms have a nucleus. (b) Both animal and plant cells have a well defined cell wall. (c) In prokaryotes, there are no membrane bound organelles. (d) Cells are formed de...
Column IColumn II(a) Cristae(i) Flat membranous sacs in stroma(b) Cisternae(ii) Infoldings in mitochondria(c) Thylakoids(iii) Disc-shaped sacs in Golgi apparatus Solution: Column IColumn II(a)...
(a) bacterial fermentation (b) regeneration of old cells (c) pre-existing cells (d) abiotic materials Solution: The answer is (c) pre-existing cells
(a) Robert Brown discovered the cell. (b) Schleiden and Schwann formulated the cell theory. (c) Virchow explained that cells are formed from pre-existing cells. (d) A unicellular organism carries...