Ascientist observes an enzyme polypeptide chain arranged in spiral turns that rise upward and are held in place by hydrogen bonds. which level of structural arrangement is s/he looking at

The correct answer will be -tertiary structure

Explanation:

Proteins are one of the important bio-molecules which perform various roles depending on their structures.  Proteins form four structures: primary (linear), secondary (folded), tertiary (highly folded) and the Quaternary structures.

The structure of the protein which can be marked by the spiral turns which are held together by hydrogen bonds formed between the C=O and N-H groups stabilize the compounds is known as the tertiary structure. This structure also contains other covalent bonds like  C=O and N-H groups phobic interactions.

Thus, the tertiary structure is the correct answer.

it is b

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succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation: