Bacteria are very small single-celled organisms that lack a nucleus. although bacterial cells are less complex than the cells that make up the human body, bacteria are very important to human health. which statement best summarizes how bacteria affect human health?
a)
bacteria cause disease in humans.
b)
bacteria are beneficial to humans.
c)
bacteria rarely affect human cells because they are so much smaller.
eliminate
d)
some bacteria are beneficial to humans and some bacteria are harmful.

The correct answer is -

D) Some bacteria are beneficial to humans and some bacteria are harmful.

Bacteria are prokaryotic organisms that do not contain a defined nucleus and membrane bound subcellular compartments (called cell organelles).

Certain bacteria are beneficial to human lives whereas other bacteria are harmful.

For example - Lactobacillus bacteria that is present in the dairy product is useful for the human health as it maintains the gut microbiota, providing good health.

there are mainly three domains in biological classification namely; archaea, bacteria, and eukarya.

archaea includes all the prokaryotic cells which are characterized by their lipid membranes. they have branched hydrocarbon which is attached to glycerol through an ether linkage.

bacteria includes all the prokaryotic cells, the cell membrane of which are made up of the unbranched fatty acid chain. in addition, they are attached to glycerol through an ester bond.

eukarya includes all the eukaryotic cells, that is, the cells contain a nucleus and other membrane-bound cell organelles.

they can be autotrophic as well as heterotrophic, unicellular as well as multicellular

they include kingdoms like protista, plantae, animalia, fungi et cetera.

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