Test 1 Flashcards
What are the basic building blocks of DNA?
4 nucleotides
Which functional group forms string covalent bonds called bridges that stabilize protein tertiary structures?
Sulfhydryl
A compound contains hydroxyl groups as its predominate functional group. Which is true concerning this compound?
It should dissolve in water
If 3 molecules of a fatty acid have the formula C16H32O2 are joined to a molecule of a glycerol C3H8O3 to make a triglyceride then the resulting molecule would have the formula
C51H98O6
The energy used to vaporize water does what?
It breaks down hydrogen bonds between water molecules
Glucose and galactose represent what?
Represent structural isomers
What maintains the secondary structure of a protein?
Hydrogen bonds
Waters high specific heat is the consequence of
Absorption and release of heat calories when hydrogen bonds break and form, respectively
We can be sure that a mole of sucrose and a mile of glucose are equal in their
Number of molecules
A solution of PH 6 contains ____ than the same amount of solution at PH 9
1000 times more H+
How would 1 make a 0.5 M solution of a 75 gram molecule?
Dissolve 37.5 grams with enough H20 to yield 1 liter of solution
How many electrons can carbon have?
10
Which molecule has a kink in it?
Unsaturated fatty acid
How many structural isomers are possible for the compound C4H10?
2
Why does ice float in liquid water?
Hydrogen bonds keep the molecules of H20 in ice farther apart than in liquid
Human sex hormones are classified as
Lipids
A given solution is found to contain 0.0001 likes of hydrogen ions (H+) per liter. What best describes this solution if added to distilled water?
Acidic: H+ released to H20
When an ice cube cools an 8 oz glass of liquid beverage by 1 degree Celsius, what is true?
Kinetic energy in the liquid beverage decreases
The body of a vertebrate like you would be composed of from 65-80 percent
Water
Which is not a protein?
-hemoglobin
-antibodies
-collagen
-enzymes
-DNA
-lysosome
DNA 🧬
Which binds form the primary structure of a protein?
Peptide bonds
In the double helix structure of a nucleic acid, cytosine will hydrogen bond to
Guanine
Which type of lipid is most important in cell membranes?
Phospholipids
Which of these hydrocarbons could have a double bond in its carbon skeleton?
C5H10
Most categories of large organic molecules are assembled by polymerization of a few kinds of simple subunits called monomers. What is an exception to the above statement?
Steroids
What ionized completely in solution and is therefore a strong acid?
HCI
What represents a correct statement about cellulose and starch?
They differ in the type of glucose from which they’re made
Which levels in the hierarchy of biological organization I Clyde all of the other levels in the list as nested subunits within it?
-organelles
-biological molecules
-cells
-atoms
-tissues
Tissues
You have a neutral atom that has an atomic number of 8. According to the stem ent you know that this atom will contain
8 protons and 8 electrons
What is the maximum number of covalent bonds an element with atomic number 16 can make with hydrogen atoms?
2
Which atoms has the same valence as carbon?
7 nitrogen
9 fluorine
10 neon
12 magnesium
14 silicone
14 silicone
What bonds are easily disrupted in the presence of water?
Ionic
What best describes the relationship between the 3 atoms?
1H
2H
3H
All are isotopes of hydrogen
The maximum number of electrons in the Is orbital is
2
Blueberries grow best in the moderately acidic soil. What is an appropriate pH of a soil that is good for growing blueberries?
4.8
What best describes chemical equilibrium?
Reactions continuing with no effect on the concentrations of reactants and products
What results when an electron is transferred from atom to another?
Ionic bond
True or false about water:
Compared to most liquids, the evaporation of water requires a large amount of heat
True
About what temperature is water at its densest state?
4 degrees Celsius
For what reason are hydrocarbons not soluble in water?
They are non-polar compounds
What determines the cohesiveness of water molecules?
Water’s polarity
The 20 different amino acids found in polypeptides exhibit different chemical and physical properties because of
Side chains (R groups)
Polysaccharides, nucleic acids, and proteins are similar in that they
Are synthesized from monomers by the process of dehydration reactions
The element nitrogen is present in all except
Proteins
Nucleic acids
Amino acids
DNA
monosaccharides
Monosaccharides
A 1M glycerol solution would contain how many glycerol (C3H8O3) molecules?
6.02 x 10^23
Ambient air temperature usually increases when water condenses and forms water droplets. Which behavior of water is most directly responsible for this phenomenon?
Release of heat by the formation of hydrogen bonds
