tishaadams2160
28.01.2021 •
Biology
Which human activity would help preserve our natural resources? *
A:deforestation
B:overfishing
C:recycling
D:driving gasoline cars
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Ответ:
Obviously recycling
Explanation:
Recycling helps protect the environment/natural resources
Recycling reduces the need for extracting (mining, quarrying and logging), refining and processing raw materials. All of these create substantial air and water pollution. As recycling saves energy it also reduces greenhouse gas emissions, which helps to tackle climate change.
Ответ:
a. preventing the cross-linkage of NAM subunits
Explanation:
The bacterial cell wall is made of peptidoglycan which is a polymer of alternating N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) residues. The NAM residues are crosslinked to impart additional strength to the cell wall.
Most of the antibiotics that target the cell wall synthesis in bacteria inhibit the enzyme of transpeptidation which in turn cross-links the NAM residues of the polysaccharide chains of the bacterial cell wall. Examples of these antibiotics include penicillins and cephalosporins.