General Science Class 8th MCQs=682

• 
  
• Biotechnology is a branch of science in which living things are used to make better or new products.
  
• In biotechnology the genetic material (DNA) of microorganisms is used for production of required product.
• DNA is made up of units called nucleotide.
• There are four type of nucleotide (1) adenine nucleotide  (2) guanine nucleotide  (3) cytosine nucleotide               (4) thymine nucleotide
• The process in which the DNA of a cell is duplicated to make two similar copies of the parents DNA is called Replication.
• Chromosomes are the colored body present in the nucleus.
• Chromosome is made up of DNA, coiled many times around a protein called histone.
  
• Genes is occur in pairs and are located on chromosomes.
• Insulin is produced by genetic engineering for the treatment of diabetic patients.
• Bacteria:
• 
  
• Bacteria are unicellular organisms.
• Cytoplasm, the fluid inside the cell.
• Bacteria doesn’t has nucleus.
• Each bacterium has a single chromosome present in the cytoplasm is called nucleoid.
• Tail like structure that help bacteria move is called flagella.
  
• Outer side of bacteria cell is called cell wall.
  
• DNA replication is process of coping DNA molecule.
• A gene is the unit of hereditary material which contains all the information of organism characteristics.
• The bacterium which takes in the recombinant DNA is called transgenic bacterium or genetically modified bacterium (GMB).
  
• Penicillin is an example of antibiotic.
  
• The four major areas in which biotechnology techniques are applied include agriculture, food production and preservation, health and environment.
• Herbicides and pesticides are used to eliminate weeds and insects and thus protect crops.

---

The additional circular pieces of DNA represent in bacterial cell are called
a) RNA                                   
b) Chromatid
c) Plasmid                  
d) Nucleotide

Show answer Comments

---

The branch of science in which having organisms are used for the welfare of humans is called…………. NTS CT -------2018
a) Biotechnology        
b) Biochemistry
c) Microbiology                      
d) Genetics

Show answer Comments

---

Plasmid and attached foreign gene with it are collectively called………
a) Recombinant cell  
b) Recombinant DNA
c) Recombinant plasmid         
d) Recombinant chromosome

Show answer Comments

---

The organism whose genes are modified is called…………..
a) Recombination organism    
b) Transgenic organism
c) GM organism        
d) All of These

Show answer Comments

---

Which one of the following was the first genetically modified crop?  NTS Past -------CT Test
a) Potato                     
b) Tomato
c) Rice                        
d) Wheat

Show answer Comments

---