Chemical Context
Titanium has an atomic number of 22. How many protons, neutrons, and electrons are in an isotope of titanium with mass number of 48?
A. p=22, n=26, e=22
B. p = 11, n = 26, e = 11
C. p = 11, n = 11, e = 70
D. p = 11, n = 22, e = 48
E. p = 22, n = 22, e = 48
A. p=22, n=26, e=22
Which of the following molecules will dissolve in water?
a. CH4
b. Cl2
c. C2H6
d. NaCl
d. NaCl because it is an ionic compound. Salt easily dissolves in water
What functional group behaves as a base in organic molecules?
A. amino
B. carboxyl
C. carbonyl
D. sulfhydryl
E. hydroxyl
A. amino
Assuming they all had the same number of carbon atoms, which of the following has the most C-H bonds?
a. unsaturated fat
b. a polyunsaturated fat
c. polysaccharide
d. saturated fat
d. saturated fat
Which of the following is NOT one of the basic features all cells have?
a. plasma membrane
b. cytosol
c. cell wall
d. Ribosomes
C. cell wall
An atom of oxygen has an atomic number of 8. How many electrons are in the first, second, and third electron shells, respectively
A. 2, 3, 3
B. 2, 6, 0
C. 8, 0, 0
D. 0, 4, 4
E. none of the above
B. 2, 6, 0
Which of the following explains how a pool of water can crack a boulder sitting in it during freezing weather?
A. expansion of the water when it freezes
B. corrosion of the minerals in the boulder
C. adhesion of the water to the minerals in the boulder
D. a and b
E. a and c
A. expansion of the water when it freezes
What type of isomer is propanol compared to acetone? (Molly-draw the two molecules)
a. cis-trans isomer
b. structural isomer
c. enantiomer
d. none of the above
b. Structural isomer
The hydrophilic and the hydrophobic parts of a phospholipid contains ______________ and _______________ respectively.
a. Two fatty acid chains; glycerol + phosphate
b. Glycerol + two fatty acid chains; phosphate
c. Glycerol + phosphate; two fatty acid chains
d. Two fatty acid chains + phosphate; glycerol
c. glycerol + phosphate; two fatty acid chains
What is made in the nucleolus?
location of RNA synthesis
What is the electron configuration of Silicon?
1s^2, 2s^2, 2p^6, 3s^2, 3p^2
Water exhibits unique properties that make it essential for life. Which of the following statements best explains why water has such unique characteristics?
A. Water molecules are held together by ionic bonds.
B. Water has a low heat capacity, allowing it to change temperature easily.
C. Water molecules form hydrogen bonds, leading to high cohesion, adhesion, and surface tension.
D. Water is a nonpolar molecule, making it an excellent solvent for nonpolar substances.
C. Water molecules form hydrogen bonds, leading to high cohesion, adhesion, and surface tension.
What type of reaction connects all monomers?
a. dehydration reaction
b. hydrolysis reaction
c. none of the above
a. dehydration reaction
Nucleic acids are chains of 5-carbon sugars linked by _______________ bonds with an organic base protruding from each sugar.
a. amino
b. phosphodiester
c. carboxyl
d. phosphate
B. phosphodiester
Which of the following structures is NOT part of the endomembrane system?
A. Golgi apparatus
B. Endoplasmic reticulum
C. Mitochondria
D. Lysosomes
C. Mitochondria
What kind of bond would be present in a completely flat section of a biological molecule?
A. single bond
B. double bond
C. triple bond
D. b or c
E. a or c
D. b or c
A solution is prepared by dissolving 35.00 g of KNO₃ into enough water to make 750.0 mL of solution. Calculate its molarity.
0.4617 M
Visualize the structural formula of each of the following hydrocarbons. Which hydrocarbon has a double bond in its carbon skeleton?
a. C3H8
b. C2H6
c. C2H4
d. C2H2
c. C2H4
In a DNA molecule, what holds together nitrogenous bases from the two polymer chains?
a. phosphodiester bonds
b. ionic bonds
c. covalent bonds
d. peptide bonds
e. hydrogen bonds
e. hydrogen bonds
Which of the following are similarities between mitochondria and chloroplasts?
a. Enveloped by a double membrane
b. grow and reproduce somewhat independently in cells
c. contain free ribosomes and circular DNA molecules
d. both make ATP molecules by breaking down food
D. both make ATP molecules by breaking down food.
Why? photosynthesis gets the energy from light not from food.
Which of the following molecules has only nonpolar bonds?
a. H2O
b. CO2
c. O2
d. NH3
c. O2
Compared to an acidic solution at pH 5, a basic solution at pH 8 has __________.
A. 1,000 times more hydrogen ions
B. 1,000 times fewer hydrogen ions
C. 100 times fewer hydrogen ions
D. the same number of hydrogen ions but more hydroxide ions
B. 1,000 times fewer hydrogen ions
Using the molecule (that molly will put on the board) how many/what are the functional groups the molecule contains?
Hydroxyl
Carboxyl
Amino
A polysaccharide you are studying contains unbranched beta glucose molecules and cannot be digested by humans. Which polysaccharide are you studying?
a. cellulose
b. DNA
c. chitin
d. starch
e. glycogen
a. cellulose
What is the function of Glyoxysomes?
They are in fat-storing tissues of plant seeds, and they convert fatty acids to sugar to feed an emerging seedling.