Which is the conjugate base of methylamine (CH 3 NH 2 )?

So here's a practice problem on acids and bases asking which is the conjugate base of methylamine, which is CH3 NH2. And so recall that conjugate acids and bases, they only differ from each other by just a single hydrogen atom and a single charge for that matter. And so here we have methylamine which is c h 3 and h 2, and so its conjugate base is gonna be one less hydrogen atom. And so, we know that, CH3, so here we have our NH2, we know that the carbon atoms, carbon hydrogen atoms, do not tend to be acidic hydrogens, whereas, this NH 2, this, amino group here can have an acidic hydrogen. So our acidic hydrogen is gonna be one of these, hydrogens branching off of the, nitrogen. And so, recall that the conjugate base is gonna differ by just one hydrogen, so we're still gonna have our, CH3, And then the nitrogen is going to lose 1 of its hydrogen, 1 of its hydrogens and therefore, it's gonna have an additional, negative charge to it. So it's gonna have a a negative charge. And so, we're looking for this molecule here. And so when we look at our answer options, we see that option a here is the only one that's a good representation of the conjugate base of methylamine. So this one here has a positive charge to it, which we know is incorrect. This would be the, conjugate acid here. This one here looks like it lost the hydrogen on its carbon, which we know is not gonna be the case. This one over here looks like it somehow gained an additional oxygen, which is definitely not correct and we know that it's not none of the above. So all of these are incorrect and we can indicate that, a, here's the correct answer and I'll see you guys in our next practice video.

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1. Introduction to Biochemistry4h 36m

What is Biochemistry?
7m

Characteristics of Life
12m

Abiogenesis
13m

Nucleic Acids
16m

Proteins
12m

Carbohydrates
8m

Lipids
10m

Taxonomy
10m

Cell Organelles
12m

Endosymbiotic Theory
11m

Central Dogma
22m

Functional Groups
15m

Chemical Bonds
13m

Organic Chemistry
31m

Entropy
17m

Second Law of Thermodynamics
11m

Equilibrium Constant
10m

Gibbs Free Energy
37m

2. Water3h 23m

Properties of Water
18m

Osmosis
18m

Hydrophobic Effect
16m

Acids and Bases
8m

Autoionization of Water
16m

pH
11m

Acid Dissociation Constant
19m

Henderson Hasselbalch Equation
27m

Determining Predominate Species
10m

Titration
35m

Buffer Solution
20m

3. Amino Acids8h 10m

Amino Acid Groups
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Amino Acid Three Letter Code
13m

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Amino Acid Configuration
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Essential Amino Acids
14m

Nonpolar Amino Acids
21m

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How to Memorize Amino Acids
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Zwitterion
33m

Non-Ionizable Vs. Ionizable R-Groups
11m

Isoelectric Point
10m

Isoelectric Point of Amino Acids with Ionizable R-Groups
51m

Titrations of Amino Acids with Non-Ionizable R-Groups
44m

Titrations of Amino Acids with Ionizable R-Groups
38m

Amino Acids and Henderson-Hasselbalch
44m

4. Protein Structure10h 4m

Peptide Bond
18m

Primary Structure of Protein
31m

Altering Primary Protein Structure
15m

Drawing a Peptide
44m

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42m

Isoelectric Point of a Peptide
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22m

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Alpha Helix Pitch and Rise
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24m

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20m

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5m

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29m

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Mass Spectrum
47m

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16m

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16m

Overview of Direct Protein Sequencing
30m

Amino Acid Hydrolysis
10m

FDNB
26m

Chemical Cleavage of Bonds
29m

Peptidases
1h 6m

Edman Degradation
30m

Edman Degradation Sequenator and Sequencing Data Analysis
4m

Edman Degradation Reaction Efficiency
20m

Ordering Cleaved Fragments
21m

Strategy for Ordering Cleaved Fragments
58m

Indirect Protein Sequencing Via Geneomic Analyses
24m

6. Enzymes and Enzyme Kinetics13h 38m

Enzymes
24m

Enzyme-Substrate Complex
17m

Lock and Key Vs. Induced Fit Models
23m

Optimal Enzyme Conditions
9m

Activation Energy
24m

Types of Enzymes
41m

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19m

Electrostatic and Metal Ion Catalysis
11m

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18m

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10m

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24m

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35m

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11m

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Vmax Enzyme
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Steady-State Conditions
25m

Michaelis-Menten Assumptions
18m

Michaelis-Menten Equation
52m

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43m

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20m

Shifting Lineweaver-Burk Plots
37m

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40m

Calculating Km
31m

Kcat
46m

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1h 1m

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Enzyme Inhibition
13m

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12m

Reversible Inhibition
9m

Inhibition Constant
26m

Degree of Inhibition
15m

Apparent Km and Vmax
29m

Inhibition Effects on Reaction Rate
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Competitive Inhibition
52m

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Recap of Reversible Inhibition
37m

Allosteric Regulation
7m

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17m

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18m

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25m

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15m

Post Translational Modification
14m

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19m

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16m

Zymogens
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Introduction to Protein-Ligand Interactions
15m

Protein-Ligand Equilibrium Constants
22m

Protein-Ligand Fractional Saturation
32m

Myoglobin vs. Hemoglobin
27m

Heme Prosthetic Group
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Hill Equation
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19m

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23m

BPG Regulation of Hemoglobin
24m

Fetal Hemoglobin
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Sickle Cell Anemia
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Chymotrypsin
18m

Chymotrypsin's Catalytic Mechanism
38m

Glycogen Phosphorylase
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Liver vs Muscle Glycogen Phosphorylase
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Antibody
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ELISA
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Glycosidic Bond
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10. Lipids5h 49m

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30m

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11m

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12m

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8m

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11. Biological Membranes and Transport 6h 37m

Biological Membrane Transport
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Passive vs. Active Transport
18m

Passive Membrane Transport
21m

Facilitated Diffusion
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Erythrocyte Facilitated Transporter Models
30m

Membrane Transport of Ions
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15m

Sodium-Potassium Ion Pump
20m

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10m

ABC Transporters
12m

Secondary Active Membrane Transport
12m

Glucose Active Symporter Model
19m

Endocytosis & Exocytosis
18m

Neurotransmitter Release
23m

Summary of Membrane Transport
21m

Thermodynamics of Membrane Diffusion: Uncharged Molecule
51m

Thermodynamics of Membrane Diffusion: Charged Ion
1h 1m

12. Biosignaling9h 45m

Introduction to Biosignaling
44m

G protein-Coupled Receptors
32m

Stimulatory Adenylate Cyclase GPCR Signaling
42m

cAMP & PKA
28m

Inhibitory Adenylate Cyclase GPCR Signaling
29m

Drugs & Toxins Affecting GPCR Signaling
20m

Recap of Adenylate Cyclase GPCR Signaling
5m

Phosphoinositide GPCR Signaling
58m

PSP Secondary Messengers & PKC
27m

Recap of Phosphoinositide Signaling
7m

Receptor Tyrosine Kinases
26m

Insulin
28m

Insulin Receptor
23m

Insulin Signaling on Glucose Metabolism
57m

Recap Of Insulin Signaling in Glucose Metabolism
6m

Insulin Signaling as a Growth Factor
1h 1m

Recap of Insulin Signaling As A Growth Factor
9m

Recap of Insulin Signaling
1m

Jak-Stat Signaling
25m

Lipid Hormone Signaling
15m

Summary of Biosignaling
13m

Signaling Defects & Cancer
20m

Review 1: Nucleic Acids, Lipids, & Membranes2h 47m

Nucleic Acids 1
9m

Nucleic Acids 2
11m

Nucleic Acids 3
4m

Nucleic Acids 4
4m

DNA Sequencing 1
9m

DNA Sequencing 2
11m

Lipids 1
11m

Lipids 2
4m

Membrane Structure 1
10m

Membrane Structure 2
9m

Membrane Transport 1
8m

Membrane Transport 2
4m

Membrane Transport 3
6m

Practice - Nucleic Acids 1
11m

Practice - Nucleic Acids 2
3m

Practice - Nucleic Acids 3
9m

Lipids
11m

Practice - Membrane Structure 1
7m

Practice - Membrane Structure 2
5m

Practice - Membrane Transport 1
6m

Practice - Membrane Transport 2
6m

Review 2: Biosignaling, Glycolysis, Gluconeogenesis, & PP-Pathway3h 12m

Biosignaling 1
9m

Biosignaling 2
19m

Biosignaling 3
11m

Biosignaling 4
9m

Glycolysis 1
7m

Glycolysis 2
7m

Glycolysis 3
8m

Glycolysis 4
10m

Fermentation
6m

Gluconeogenesis 1
8m

Gluconeogenesis 2
7m

Pentose Phosphate Pathway
15m

Practice - Biosignaling
13m

Practice - Bioenergetics 1
10m

Practice - Bioenergetics 2
16m

Practice - Glycolysis 1
11m

Practice - Glycolysis 2
7m

Practice - Gluconeogenesis
5m

Practice - Pentose Phosphate Path
6m

Review 3: Pyruvate & Fatty Acid Oxidation, Citric Acid Cycle, & Glycogen Metabolism2h 26m

Pyruvate Oxidation
9m

Citric Acid Cycle 1
14m

Citric Acid Cycle 2
7m

Citric Acid Cycle 3
7m

Citric Acid Cycle 4
11m

Metabolic Regulation 1
8m

Metabolic Regulation 2
13m

Glycogen Metabolism 1
6m

Glycogen Metabolism 2
8m

Fatty Acid Oxidation 1
11m

Fatty Acid Oxidation 2
8m

Citric Acid Cycle Practice 1
7m

Citric Acid Cycle Practice 2
6m

Citric Acid Cycle Practice 3
2m

Glucose and Glycogen Regulation Practice 1
4m

Glucose and Glycogen Regulation Practice 2
6m

Fatty Acid Oxidation Practice 1
4m

Fatty Acid Oxidation Practice 2
7m

Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation1h 48m

Amino Acid Oxidation 1
5m

Amino Acid Oxidation 2
11m

Oxidative Phosphorylation 1
8m

Oxidative Phosphorylation 2
10m

Oxidative Phosphorylation 3
10m

Oxidative Phosphorylation 4
7m

Photophosphorylation 1
5m

Photophosphorylation 2
9m

Photophosphorylation 3
10m

Practice: Amino Acid Oxidation 1
2m

Practice: Amino Acid Oxidation 2
2m

Practice: Oxidative Phosphorylation 1
5m

Practice: Oxidative Phosphorylation 2
4m

Practice: Oxidative Phosphorylation 3
5m

Practice: Photophosphorylation 1
5m

Practice: Photophosphorylation 2
1m

2. Water

Acids and Bases

Biochemistry

2. Water

Acids and Bases

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Multiple Choice

Which is the conjugate base of methylamine (CH ₃NH₂)?

CH₃NH^-

CH₃NH₃⁺

CH₂NH₂^-

CH₃NH₂OH^-

None of the above.

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Verified step by step guidance

Understand the concept of a conjugate base: A conjugate base is formed when an acid donates a proton (H+). In this case, methylamine (CH3NH2) acts as a base, so its conjugate base is formed by removing a proton from it.

Identify the structure of methylamine: Methylamine is CH3NH2, which consists of a methyl group (CH3-) attached to an amino group (NH2).

Determine the removal of a proton: When methylamine donates a proton, it loses an H+ ion from the NH2 group, resulting in the formation of CH3NH-.

Compare with the given options: The conjugate base of methylamine, after losing a proton, is CH3NH-.

Verify the answer: Ensure that CH3NH- is listed among the options and confirm it as the correct conjugate base of methylamine.