jejeleus, and other membrane-bound organelles. The DNA of a prokaryotic cell consists of a single circular chromosome that is in direct contact with the cytoplasm. The nuclear region in the cytoplasm is called the nucleoid. A prokaryotic cell has three regions: • Enclosing the cell is the cell envelope – generally consisting of a plasma membrane covered by a cell wall which, for some bacteria, may be further covered by a third layer called a capsule. The cell wall consists of peptidoglycan in bacteria, and acts as an additional barrier against exterior forces. • Inside the cell is the cytoplasmic region that contains the genome (DNA), ribosomes and various sorts of inclusions.. Prokaryotes can carry extrachromosomal DNA elements called plasmids, which are usually circular. Though not forming a nucleus, the DNA is condensed in a nucleoid. • On the outside, flagella and pili project from the cell's surface. These are structures (not present in all prokaryotes) made of proteins that facilitate movement and communication between cells. 26(i) Which type of cell were the first form of life on Earth. a) Prokaryotes b) Eukaryotes c) Both d) None of the above 26.ii) The Prokaryotic cell has the regions i) Cell envelope ii) Plasma membrane iii) Cell wall iv) peptidoglycan Which among the above choices are correct? a) Only option- (i) b) Both the options (i) and (ii) c) Options (i), (ii) and (iii) d) None of the above options are correct 26.iii) Component/s which are present in prokaryotes are 1. Mitochondria 2. Plasmids 3. 70 S Ribosomes 4. pili a) 1 only (b) 2,3,4 (c) None of these d) All of these 26.iv) Prokaryotes have an undefined nuclear region which is known as (a) Nucleus (b) Nucleoid (c) Nucleolus (d) Nucleic acid 26.v) A cell organelle that is not surrounded by a membrane is (a) Golgi apparatus (b) Ribosome (c) Chloroplast (d) Endoplasmic reticulum Read the following and answer all the questions from 27 (i) to 27(v) Anything that occupies some space, having mass, volume and can be felt by one or more out of five senses is called matter. The purest form of matter is called an element. An element is a substance which cannot be split up into two or more simpler substances by the usual ch
Answers
Answer:
by a cell wall which, for some bacteria, may be further covered by a third layer called a capsule. The cell wall consists of peptidoglycan in bacteria, and acts as an additional barrier against exterior forces. • Inside the cell is the cytoplasmic region that contains the genome (DNA), ribosomes and various sorts of inclusions.. Prokaryotes can carry extrachromosomal DNA elements called plasmids, which are usually circular. Though not forming a nucleus, the DNA is condensed in a nucleoid. • On the outside, flagella and pili project from the cell's surface. These are structures (not present in all prokaryotes) made of proteins that facilitate movement and communication between cells. 26(i) Which type of cell were the first form of life on Earth. a) Prokaryotes b) Eukaryotes c) Both d) None of the above 26.ii) The Prokaryotic cell has the regions i) Cell envelope ii) Plasma membrane iii) Cell wall iv) peptidoglycan Which among the above choices are correct? a) Only option- (i) b) Both the options (i) and (ii) c) Options (i), (ii) and (iii) d) None of the above options are correct 26.iii) Component/s which are present in prokaryotes are 1. Mitochondria 2. Plasmids 3. 70 S Ribosomes 4. pili a) 1 only (b) 2,3,4 (c) None of these d) All of these 26.iv) Prokaryotes have an undefined nuclear region which is known as (a) Nucleus (b) Nucleoid (c) Nucleolus (d) Nucleic acid 26.v) A cell organelle that is not surrounded by a membrane is (a) Golgi apparatus (b) Ribosome (c) Chloroplast (d) Endoplasmic