SCIENCE
VIRUS AND BACTERIA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A nonliving particle that invades and then reproduces inside a living cell.
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An organism that feeds on a living host
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An organism that nourishes a parasite
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Single-Celled organisms that lack a nucleus.
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Detailed explanation-1: -Prokaryotes are organisms whose cells lack a nucleus and other organelles. Prokaryotes are divided into two distinct groups: the bacteria and the archaea, which scientists believe have unique evolutionary lineages. Most prokaryotes are small, single-celled organisms that have a relatively simple structure.
Detailed explanation-2: -Bacteria are single celled microbes that lack a nucleus. Archaea are like bacteria, but they have different structures and properties. This gives them the ability to live in extreme environmental conditions. Protozoa are unicellular microorganisms that have nuclei.
Detailed explanation-3: -Single-celled organisms are called unicellular organisms. All prokaryotic organisms such as Bacteria, Archaea are unicellular. A single cell performs all functions such as metabolism, excretion and reproduction. They reproduce by asexual means.
Detailed explanation-4: -Definition: A cell that lacks a nucleus enclosed within a nuclear envelope and membrane-bound organelles such as mitochondria. Prokaryotes are single-celled life forms. They include bacteria as well as archaea, which resemble bacteria but also share genetic and biochemical features with eukaryotes.
Detailed explanation-5: -Bacteria lack a membrane-bound nucleus and other internal structures and are therefore ranked among the unicellular life-forms called prokaryotes.