Unit 1 Flashcards
What are the 4 basic biomolecule compounds?
Lipids
Proteins
Carbohydrate
Nucleic Acid
What are the monomeric units of proteins and nucleic acids?
Proteins: amino acids
Nucleic acids: nucleotides
What is the parent sugar of most carbohydrates?
Glucose
What functional group links the membrane mimics and nucleotides?
Glycerol
Describe a monomer and a polymer
Monomer:The single units that make up a macromolecule
Polymer: multiple monomeric units joined together form a polymer
What are the organic elements?
C, H, O, N, P, S
Life is ______ based
Carbon
In terms of rotation what is the difference between a single and a double bond?
Single allows for rotation to occur
Double prevents rotation from occurring
What is a trace element?
Essential but do not require them in large amounts. Essential because our body cannot make them.
Define nucleoside and nucleotide
Phosphate, sugar and base = nucleotide
Sugar and a base = nucleoside
Describe purines and give examples
Dicyclic, ex: Adenosine, Guanine
Describe Pyrimidines and give examples
Monocyclic
Ex: Uracil, thymine, cytosine
What is the general path of energy transformations?
Potential energy -> energy transductions accomplish work resulting in Heat and simple compounds -> simple compounds polymerize to form information such as DNA, RNA, Protein.
________ predominate at pH values between the pka values of the amino and carboxyl groups
Zwitterions
When net charge is _______ when Zwitterions are present
Zero
What is the difference between primary vs secondary amino groups?
Primary amino groups are free and not connected to anything but the alpha carbon (ex: alanine)
Secondary amino groups are further bonded to a second carbon group (ex: proline)
Proline is not a typical amino acid because its amino group is a __________ amine and because of this feature, it is called an ________ acid
Secondary
Imino
________ binds to another _______ through their R groups to form disulfide bonds
Cysteine
Cysteine
What amino acids have negatively charged R groups?
Aspartate and Glutamate
A negative charge indicates the amino acid has donated a _______ at physiologic pH making it _______
Proton
Acidic
What are the amino acids that contain positively charged (basic) R groups?
Lysine (K)
Arginine (R)
Histidine (H)
Positive charge indicates the amino acids have _______ a proton at physiologic pH making it _______
Accepted
Basic
Polar in charged R groups side chains can form _______ bonds
Hydrogen bonds
What are the amino acids that have polar uncharged R groups
Serine
Threonine
Cysteine
Asparagine
Glutamine
What amino acids contain sites for phosphorylation?
Serine
Threonine
Tyrosine
What amino acids have aromatic R groups?
Phenylalanine
Tyrosine
Tryptophan
________ R groups absorb UV light at 270-280nm
Aromatic
What amino acids have nonpolar, aliphatic R groups?
Glycine Alanine Proline Valine Leucine Isoleucine Methionine
Polar uncharged, positively charged and negatively charged and 1 aromatic (tyrosine) are all ________ amino acids
Hydrophilic
Phenylalanine and tryptophan (aromatic R groups) and the non polar aliphatic amino acids are all ________ amino acids
Nonpolar, amino acids
Amino acids can act as buffers in two pH regimes pointed out via _______ and ______ on the graphs
Pk1 and pK2
When have an acidic amino acids, how do you find the isoelectric point?
Take pKr and pK1 and add them together then divide them by 2
If have a basic amino acid, how do you calculate the isoelectric point (pI)?
Take the pKR and the pK2 and add them together then divide them by 2.
Net charge is ______ when pI=pH
Zero
In any other case in finding the pI of an uncharged amino acid, what is the math?
take the pK1 and pKR and divide it by 2
In the hydropathy index, a large positive index indicates that the R group is very ___________
In the hydropathy Index, a very negative index indicates that the R group is very _________
Hydrophobic
Hydrophilic
Cysteine is generally classified as having a ________ R group despite having a positive hydropathy index
Polar
What does a small positive or negative index indicate?
That the R is neither very hydrophobic nor very hydrophilic
What is the most hydrophobic amino acid, most hydrophilic amino acid?
Most hydrophobic: Isoleucine
Most hydrophilic: Arginine
What are the hydrophobic amino acids and their ranking on the hydropathy index
1) isoleucine
2) Valine
3) Leucine
4) Phenylalanine
5) methionine
6) Alanine
What is the rank of the most hydrophilic R groups based on the hydropathy index
1) Arginine
2) Lysine
3) asparagine
4) glutamine
5) aspartate
6) Glutamate
7) Histidine
How is cysteine classified as having a polar R group despite having a positive hydropathy index?
Because of the ability of the sulhydryl group to act as a weak acid to form a H bond with oxygen or nitrogen
What is the smallest amino acid?
Glycine
What is the amino acid that is classified as an imino acid?
Proline
What are the branched chain amino acids?
Isoleucine
Leucine
Valine
What is an example of a branched chain ketogenic amino acid?
Leucine
What amino acids contain sulfur?
Cysteine
Methionine
What is the largest amino acid?
Tryptophan
What amino acid can serve as a biological buffer?
Histidine
What amino acid has the lowest pI?
Aspartate
Life is ______ based
Carbon
What is the definition of a trace element?
Essential elements but are not required in large amounts.
What are the names of the following funcitonal groups? R-CH3 R-CHO R-SH R1-CO-R2 R-OH
Methyl Aldehyde Sulfhydryl Ketone Hydroxyl
What are the names of the following functional groups? R-COOH R1-S-S-R1 R1-COO-R2 R1-O-R2 R-O-PO3H
Carboxylic acid Disulfide Ester Ether Phosphoryl
What qualifies as potential energy sources?
Nutrients in environment (complex molecules such as sugar, fats)
Sunlight
What qualifies as potential energy sources?
Nutrients in environment (complex molecules such as sugars and fats)
Sunlight
How can energy be wasted to surroundings in terms of enthalpy?
Heat is given off during reactions which is known as enthalpy
ATP can break down and heat can be a byproduct
Which form of potential energy is commonly generates by cells?
ATP
______ is the change in heat or enthalpy where the reaction either gives off heat or absorb heat (endothermic or exothermic)
Heat (enthalpy)
______ is equivalent to disorder or randomness. More entropic then the ________ the disorder. Less entropic then _________ disorder of the system
Entropy
Increases
Decreases
What is used to make predictions about direction and reaction feasibility?
The change in free energy
Why are standard conditions helpful when considering series of reactions?
Used to predict the direction and how far the reaction is from equillibrium
If Keq is positive then delta G is ________ and the reaction proceed ___________
Negative
Forward
If Keq is negative then the delta G is _______ and the reaction proceeds __________
In reverse
What is the delta G of the of a reaction when it reaches equilibrium?
Free energy is zero at equilibrium
What is the equation to find standard free energy?
-RT LnKeq
Endergonic vs exergonic reactions
Endergonic reactions require external energy
Exergonic reactions do not require external energy
What two ways do living organisms use to speed up a reaction and what are the barriers of the other two?
Energy coupling (coupling ATP with endergonic reactions to make them exergonic) Lower activation barrier by catalysis
Barriers of the other two are 1) with higher temperatures, the stability of macromolecules is limiting 2) higher concentration of reactants is costly bc it requires more valuable starting material