Log In

Your email is not your username

Register

If you were a member of the old Bodybuilding.com forums and would like to reuse your previous username, you can request it below. We use your email only for registration and do not store it. For more information, please see our Privacy Policy.

Confirm your email

A registration code was sent to your email. Enter it here.

Welcome

You have successfully setup your account.

Sign in

Quick Navigation Bottom Misc
Forum » Biology/Chemistry Miscers (elementary question)
  1. Results 1 to 9 of 9
  2. Page 1 of 1

Thread: Biology/Chemistry Miscers (elementary question)

post 1614927641 08-28-2020, 04:07 PM
-
#1
  1. drvillain
  2. False Football Prophet
  1. drvillain
  2. False Football Prophet
  3. Join Date: Jan 2010
  4. Posts: 48,835
  5. Rep Power: 281012

Biology/Chemistry Miscers (elementary question)

My class is going over peptide linkages (Amide) right now, so I'm trying my best to understand everything on a deeper level than just enough to pass the class. For the amino groups, does the circled mean anything? Is it a covalent bond symbol or is that just how you write out amino groups?





the "+" means that the basic amino group added a proton (positive charge) correct?

Also, is there any substantial difference in the 4 ways the amino groups are written here?
post 1614928651 08-28-2020, 04:16 PM
-
#2
  1. drvillain
  2. False Football Prophet
  1. drvillain
  2. False Football Prophet
  3. Join Date: Jan 2010
  4. Posts: 48,835
  5. Rep Power: 281012
pls respond
post 1614928831 08-28-2020, 04:18 PM
-
#3
  1. GlassMoon
  2. Negged srs
  1. GlassMoon
  2. Negged srs
  3. Join Date: Apr 2012
  4. Posts: 28,993
  5. Rep Power: 129907
fuk i hated chem
See user title srs
post 1614930151 08-28-2020, 04:32 PM
-
#4
  1. gregr507
  2. Registered User
  1. gregr507
  2. Registered User
  3. Join Date: Dec 2006
  4. Posts: 606
  5. Rep Power: 7886
Originally Posted By drvillain⏩
My class is going over peptide linkages (Amide) right now, so I'm trying my best to understand everything on a deeper level than just enough to pass the class. For the amino groups, does the circled mean anything? Is it a covalent bond symbol or is that just how you write out amino groups?





the "+" means that the basic amino group added a proton (positive charge) correct?

Also, is there any substantial difference in the 4 ways the amino groups are written here?
Yes, you basically have it right. The circled lines are to indicate that it is a side chain, or part of a larger molecule (the amino acid). Basically it's showing the the N is attached to another atom (a carbon atom in this case). The top two examples are just drawn out versions of what the bottom 2 are saying.

Now this part might be wrong, it's been a while since I took chem. But nitrogen has 5 valence electrons. In the NH2 group, 3 are taken by single covalent bonds, and 2 are in a lone pair, so there is no charge on it. In NH3, the lone pair has been replaced by a single covalent bond. Now the Nitrogen "owns" 4 electrons, rather than 5. This is what gives it a +1 net charge
~Misc Med Crew~
MFC
post 1614930181 08-28-2020, 04:32 PM
-
#5
  1. ralphlaurenbrah
  2. Registered User
  1. ralphlaurenbrah
  2. Registered User
  3. Join Date: Oct 2013
  4. Age: 36
  5. Posts: 10,357
  6. Rep Power: 31773
The + means that they either have an extra hydrogen atom, for example NH4+, or lost a pair of electrons.

The circled just means they are connected to another atom or group of atoms. It is just missing the other atom or group of atoms on the other side of that bond.


Look up peptide bonds or amino groups on khan academy to learn more I don’t remember this **** from ochem because that subject is basically never used once you graduate and go into medicine
post 1614930341 08-28-2020, 04:34 PM
-
#6
  1. KyBrah32
  2. Registered Hick
  1. KyBrah32
  2. Registered Hick
  3. Join Date: Feb 2012
  4. Location: Kentucky, United States
  5. Age: 35
  6. Posts: 12,087
  7. Rep Power: 96553
I think that's just how amines are denoted. NH3+ is a charged ion where an electron is removed from a molecule of ammonia
“Gotta have opposites, light and dark and dark and light, in painting. It’s like in life. Gotta have a little sadness once in awhile so you know when the good times come" - Bob Ross
post 1614930551 08-28-2020, 04:36 PM
-
#7
  1. hbhorat
  2. We're all gona make it
  1. hbhorat
  2. We're all gona make it
  3. Join Date: May 2011
  4. Location: Perth, W.A, Australia
  5. Age: 29
  6. Posts: 6,045
  7. Rep Power: 20603
Chem not even twice brah
"Gotta do what you gotta do in order to be successful"

*Mod changed my sig to "Sig line can't be a novel" even though lots of people have longer sigs crew

*Mod is watching me while I sleep.....

*KENKONGs fan club crew*
post 1614932051 08-28-2020, 04:54 PM
-
#8
  1. MYOFIBRAH
  2. mL/kg/min
  1. MYOFIBRAH
  2. mL/kg/min
  3. Join Date: May 2012
  4. Posts: 7,154
  5. Rep Power: 39290
Originally Posted By gregr507⏩
Yes, you basically have it right. The circled lines are to indicate that it is a side chain, or part of a larger molecule (the amino acid). Basically it's showing the the N is attached to another atom (a carbon atom in this case). The top two examples are just drawn out versions of what the bottom 2 are saying.

Now this part might be wrong, it's been a while since I took chem. But nitrogen has 5 valence electrons. In the NH2 group, 3 are taken by single covalent bonds, and 2 are in a lone pair, so there is no charge on it. In NH3, the lone pair has been replaced by a single covalent bond. Now the Nitrogen "owns" 4 electrons, rather than 5. This is what gives it a +1 net charge
These.

the group will never gain a proton. bonding occurs by the actions of moving electrons. adding a proton would change the element, which doesn’t happen. positive charge happens from loss of electron.

the way they are written only matters if you are asked to show the bonding structures.
Discipline is the bridge between goal and accomplishment

For the wretched of the earth, they are everywhere
post 1614939431 08-28-2020, 06:27 PM
-
#9
  1. numberguy12
  2. Registered User
  1. numberguy12
  2. Registered User
  3. Join Date: Jan 2017
  4. Posts: 6,938
  5. Rep Power: 51915
Originally Posted By MYOFIBRAH⏩
These.

the group will never gain a proton. bonding occurs by the actions of moving electrons. adding a proton would change the element, which doesn’t happen. positive charge happens from loss of electron.

the way they are written only matters if you are asked to show the bonding structures.
The nitrogen nucleus itself is not gaining a proton, but the group -NH2 is gaining a proton here, in the form of a hydrogen ion H+, which is attracted to the lone pair on N to make a dative covalent bond.
∫∫ Mathematics crew ∑∑

♫1:2:3:4 Pythagoras crew ♫ ♫ 🧮

Nullius in verba
Quick Navigation Top Misc
Bookmarks
Digg.com
Digg
del.icio.us
del.icio.us
Stumbleupon.com
StumbleUpon
Google.com
Google
Facebook.com
Facebook
Posting Permissions
  1. You may not post new threads
  2. You may not post replies
  3. You may not post attachments
  4. You may not edit your posts