Zwitterion - Study guides, Class notes & Summaries

Biochemistry - Exam 1 Practice Questions & Answers 2023/2024 A+ In a bacterial cell, the DNA is in the: A) cell envelope. B) cell membrane. C) nucleoid. D) nucleus. E) ribosomes. nucleoid A major change occurring in the evolution of eukaryotes from prokaryotes was the development of: A) DNA. B) photosynthetic capability. C) plasma membranes. D) ribosomes. E) the nucleus the nucleus In eukaryotes, the nucleus is enclosed by a double membrane called the: A) cell membrane. B) nuc...

ACS Biochemistry Final Exam Questions with All Correct Answers pKa (chapter 3) - ANSWER measure of the tendency of a group to give up a proton (acidity); tendency decreases tenfold as pKa increases by one unit thioester bond (1) - ANSWER compounds with functional group C-S-CoA-C (eg, in acetyl-CoA) zwitterion (3) - ANSWER dipolar ion with both positive and negative groups but overall neutral charge; can act as either an acid or base Isoelectric point (pI) (chapter ...

pKa (chapter 3) correct answers measure of the tendency of a group to give up a proton (acidity); tendency decreases tenfold as pKa increases by one unit thioester bond (1) correct answers compounds with functional group C-S-CoA-C (eg, in acetyl-CoA) zwitterion (3) correct answers dipolar ion with both positive and negative groups but overall neutral charge; can act as either an acid or base Isoelectric point (pI) (chapter 3) correct answers the characteristic pH at which the net electr...

In a bacterial cell, the DNA is in the: A) cell envelope. B) cell membrane. C) nucleoid. D) nucleus. E) ribosomes. - answer-nucleoid A major change occurring in the evolution of eukaryotes from prokaryotes was the development of: A) DNA. B) photosynthetic capability. C) plasma membranes. D) ribosomes. E) the nucleus - answer-the nucleus In eukaryotes, the nucleus is enclosed by a double membrane called the: A) cell membrane. B) nuclear envelope. C) nucleolus. D) n...

AQA A Level Chemistry 2022 Paper 2 SOLUTION 2023//2024 How can we make polymers more flexible? - ANSWER By adding a plasticiser How do plasticisers make polymers more flexible? - ANSWER They stick between the chains and keep the polymers further apart from each other, weakening the van der Waals forces and lets chains slide more easily. Uses of Kevlar - ANSWER bulletproof and used in body armour. Uses of Nylon - ANSWER commonly used in textiles. Why are polymers strong? - ANSWER Poly...

In a bacterial cell, the DNA is in the: A) cell envelope. B) cell membrane. C) nucleoid. D) nucleus. E) ribosomes. - answer-nucleoid A major change occurring in the evolution of eukaryotes from prokaryotes was the development of: A) DNA. B) photosynthetic capability. C) plasma membranes. D) ribosomes. E) the nucleus - answer-the nucleus In eukaryotes, the nucleus is enclosed by a double membrane called the: A) cell membrane. B) nuclear envelope. C) nucleolus. D) n...

All amino acids contain a central carbon, a side chain (R group), an amino group and a __________ group. - Carboxyl Amino acids can undergo a proton transfer, thus giving both a (+) and (-) charge. This molecular state is called the ________. - Zwitterion Amino acid that are unable to be synthesised from biochemical pathways within a cell have to be consumed through dietary intake. These are called _______ amino acids. - Essential When two amino acids join together, they are joined by an a...

The net charge of the zwitterion form of Gly is ___ - answer-Zero When a peptide bond is formed, an ___ reacts with a carboxylate group - answer-Amino Group At a pH above the pKa, the phenol group of tyrosine is - answer-Deprotonated In the tripeptide Lys-Pro-Ile, there are ___ charged groups at pH 7 - answer-Three at a pH below the pKa, the ε-amino group of lysine is - answer-Protonated at a pH below the pKa, the β-carboxylate group of Asp is ___ - answer-uncharged; Protonated ...

ACS BIOCHEMISTRY FINAL EXAM QUESTIONS WITH CORRECT DETAILED ANSWERS 2023

The chirality of an amino acid results from the fact that its α carbon: A) has no net charge. B) is a carboxylic acid. C) is bonded to four different chemical groups. D) is in the L absolute configuration in naturally occurring proteins. E) is symmetric. C) is bonded to four different chemical groups. Of the 20 standard amino acids, only ___________ is not optically active. The reason is that its side chain ___________. A) alanine; is a simple methyl group B) glycine; is a hydrog...