NEET BIOLOGY

BIOLOGICAL CLASSIFICATION

VIRUSES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which statement correctly describes bacteria and viruses?
A
Viruses and bacteria are both living organisms because they have DNA and can reproduce
B
Viruses are living organisms because they have DNA and can reproduce in a host cell. Bacteria are not living organisms because they are made of cells and cause disease
C
Viruses are not living because they are not living and they cannot reproduce without a host. Bacteria are living because they are made of cells and can reproduce on their own.
D
Viruses and bacteria are both living because they cause disease in other organisms.
Explanation: 

Detailed explanation-1: -Because they can’t reproduce by themselves (without a host), viruses are not considered living. Nor do viruses have cells: they’re very small, much smaller than the cells of living things, and are basically just packages of nucleic acid and protein.

Detailed explanation-2: -A virus is not a living organism and can only grow and reproduce in the cells of a host. Bacteria, by contrast, are single-celled organisms that produce their own energy and can reproduce on their own. While both can cause disease, bacteria also serve other vital and healthful roles in nature.

Detailed explanation-3: -On a biological level, the main difference is that bacteria are free-living cells that can live inside or outside a body, while viruses are a non-living collection of molecules that need a host to survive.

Detailed explanation-4: -Viruses also lack the properties of living things: They have no energy metabolism, they do not grow, they produce no waste products, and they do not respond to stimuli. They also don’t reproduce independently but must replicate by invading living cells.

Detailed explanation-5: -Viruses are considered as something between living and non-living because they do not grow or reproduce by themselves. This makes them non-living. However, when a virus enters a living cell of an organism, it obtains energy from the host cell and starts reproducing.

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