Multiple Choice QuestionsWhat are Singer and Nicolson known for?
One-gene-one-enzyme hypothesis
Plasma membrane modifications
Fluid-mosaic model of plasma membrane
Structure of DNA
In a 50 gm living tissue, what would be the amount of water
15- 25 gm
25 - 30 gm
35- 45 gm
70- 90 gm
The outermost limiting layer of mycoplasma is made up of
cell wall
cell membrane
mucilaginous sheath
slime layer
Specific proteins responsible for the flow of materials and information into the cell are called
membrane receptors
carrier proteins
integral proteins
none of these
Assertion : Nucleus is the controlling centre of a cell.
Reason : Pores in the nuclear envelop regulate the flow of materials in and out of the nucleus.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Virchow
Hooke
Leeuwenhoek
Brown
A.
Virchow
Rudolf Virchow was the first to suggest that new cells are formed from the division of the pre-existing cells - "omnis-cellula-e-cellula" i.e. every cell is derived from a previous cell.
Robert Hooke was the first to coin the term "cell" for small structures in a piece of cork under a microscope. His observations were published in a book named Micrographia.
Leeuwenhoek was the first person to observe and describe microscopic organisms and living cell. He observed nucleus in RBC of salmon fish and used simple lens and observed nuclei and unicellular organisms including bacteria. In 1676, he described the bacteria and gave the term animalcules. His observations laid the foundations for the science of bacteriology and microbiology. Robert Brown ( 1831) described and named nucleus.
Which of the following is responsible for the mechanical support, protein synthesis and enzyme transport?
Cell membrane
Mitochondria
Dictyosome
Endoplasmic reticulum
In prokaryotes, chromatophores are
specialized granules responsible for colouration of cells
structures responsbile for organizing the shape of the organism
inclusion bodies lying free inside the cells for canying out various metabolic activities
internal membrane systems that may become extensive and complex in photosynthetic bacteria
Many cells function properly and divide mitotically even though they do not have
plasma membrane
cytoskeleton
mitochondria
plastids
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