Which of the following shows linear sequence of atoms joined by covalent bonds in peptide backbone.

a) -N-C-C-N-C-C-N
b) -N-C-O-N-C-O-
c) -N-C-C-O-N-C-C-O
d)-N-H-C-C-N-H-C-C

The answer is a). Is that because it's the only one that linear; as in it doesn't have any oxygens or hydrogens coming off of it? I don't exactly know why a) is correct b/c I thought that peptide bond is formed by condensation reaction in which you would have N-C which all options have.

you missed the point of a peptide bond. Peptide bond is when a carboxyl connects to a N

-C(O)-N- where the O is a double bonded O to the C.

a is the only one in which the backbone is shown as a peptide. Yes, I object to the "backbone" also, as it misses the point of the carboxyl C. I rate the question no better than a C+.

Thank you!

Well, it seems like you're in a bit of a pickle here. But fear not, for Clown Bot is here to provide some humorous enlightenment!

Now, let's take a look at these options. You're right, a peptide bond is formed by a condensation reaction between the amino (N) group and the carboxyl (C) group. So, we're looking for a sequence that shows a repetition of N and C atoms.

Option a) -N-C-C-N-C-C-N, well, that certainly seems like a linear sequence of atoms! It's just a nice little chain of N and C, no distractions.

Option b) -N-C-O-N-C-O-, now this one seems to have some extra oxygen (O) atoms hanging around. Oxygen certainly knows how to grab attention, doesn't it?

Option c) -N-C-C-O-N-C-C-O, ah, there it is again, oxygen trying to steal the spotlight! We don't need your extra oxygen atoms here, we're just looking for a simple sequence.

Option d) -N-H-C-C-N-H-C-C, oh dear, this one seems to have some hydrogen (H) atoms lurking about. Hydrogen, always being the party crasher!

So, by process of elimination, it looks like option a) -N-C-C-N-C-C-N is the winner! It's the only one that keeps things nice and linear without any pesky oxygens or hydrogens getting in the way.

Keep up the good work, and remember, in the world of peptide backbones, simplicity is key!

Yes, the correct answer is a) -N-C-C-N-C-C-N. This option shows a linear sequence of atoms joined by covalent bonds in the peptide backbone, specifically the amide bonds between the nitrogen (N) and carbon (C) atoms.

You are correct that peptide bonds are formed through a condensation reaction between the amino group (-NH2) of one amino acid and the carboxyl group (-COOH) of another amino acid, resulting in the formation of an amide bond (-CONH-) and the release of a water molecule.

In option a), there are no extra atoms, such as oxygen or hydrogen, attached to the peptide backbone. Thus, a) is the correct choice for a linear sequence of atoms solely joined by covalent bonds in the peptide backbone.

The correct answer is a) -N-C-C-N-C-C-N. Let me explain why.

To identify the linear sequence of atoms joined by covalent bonds in the peptide backbone, we need to understand the structure of a peptide bond and the arrangement of atoms in the backbone.

A peptide bond is formed through a condensation reaction between the amino group (-NH2) of one amino acid and the carboxyl group (-COOH) of another amino acid, resulting in the formation of an amide bond (-CONH-).

In the given options:

a) -N-C-C-N-C-C-N
b) -N-C-O-N-C-O-
c) -N-C-C-O-N-C-C-O
d) -N-H-C-C-N-H-C-C

From the options, we can see that option a) -N-C-C-N-C-C-N correctly represents the peptide backbone. This option shows a repeated pattern of N-C-C, which represents the amide bond (-CONH-). Peptide chains consist of repeating units of amino acids linked together by these bonds, forming a linear sequence. In this case, there are no additional oxygens or hydrogens present, implying a linear arrangement of atoms in the peptide backbone.

On the other hand, option b) includes an oxygen atom bonded to a carbon atom (-C-O-), which does not represent the peptide backbone. Option c) shows an oxygen atom following the amide bond (-CO) and option d) includes hydrogen atoms (-H) bonded to a carbon atom, both of which are not part of the linear peptide backbone.

Therefore, the correct choice is a) -N-C-C-N-C-C-N, as it represents the linear sequence of atoms joined by covalent bonds in the peptide backbone.