Biology questions :)?

Question

Please answer and possibly explain the answers.. Thanks. :)

True or false: 

1. The fact that some proteins can spontaneously renature implies that tertiary structure is strongly influenced by primary structure. 

2. High fevers are dangerous to humans and animals because high temperatures can cause proteins to denature or lose their proper three-dimensional shape and thus limit or prevent their ability to function. 

3. Side groups of amino acids determine the structure of proteins because each amino acid has a side group with its own particular chemical properties (e.g., nonpolar, polar, aromatic). The side group makes each amino acid unique; the sequence of amino acids (with their side groups) determines the primary structure of the polypeptide, and this in turn determines the secondary and tertiary structure as nearby side groups interact with each other and with the environment (e.g., forming hydrogen bonds or interacting hydrophobically with water). 

Last question (not true or false)

The complex folding that forms the tertiary structure of a protein is caused by
 
1) denaturation.
2) hydrophobic interactions between side groups and water.
3) the ring structure of the glucose subunits
4) van der Waal's forces between the different polypeptide chains.
5) the length of the polypeptide chain.


Thanks! :)

Anonymous · Accepted Answer

> 1. The fact that some proteins can spontaneously renature implies that tertiary structure is strongly influenced by primary structure.
True

2. High fevers are dangerous to humans and animals because high temperatures can cause proteins to denature or lose their proper three-dimensional shape and thus limit or prevent their ability to function.
True
(It's a good thing we typically maintain a steady internal temperature of 37 degrees celsius)

3. Side groups of amino acids determine the structure of proteins because each amino acid has a side group with its own particular chemical properties (e.g., nonpolar, polar, aromatic). The side group makes each amino acid unique; the sequence of amino acids (with their side groups) determines the primary structure of the polypeptide, and this in turn determines the secondary and tertiary structure as nearby side groups interact with each other and with the environment (e.g., forming hydrogen bonds or interacting hydrophobically with water).
True

The complex folding that forms the tertiary structure of a protein is caused by
2) hydrophobic interactions between side groups and water.
4) van der Waal's forces between the different polypeptide chains.
5) the length of the polypeptide chain.
Evil question.  It's caused by all of 2, 4, 5, hydrophilic interactions, "mechanical" stress on the bond angles, and some other things too (read question #3 again).
If you have to pick just one, then pick this one:
2) hydrophobic interactions between side groups and water.


Polypeptides are polymers of...
Peptides or amino acid residues.  Since that's not among your choices, pick this one:
1. amino acids

angie_lege · Answer

1) False
2) True
3) True

4)the ring structure of the glucose subunits

5)Amino Acids

tarvin · Answer

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Biology questions :)?

3 Answers