AAMC MCAT OFFICIAL PREP
SAMPLE
Which image best illustrates electric field lines between the inside of an axon and its
surrounding extracellular fluid?
o -Electric field lines exit from (+) and enter (-). The axon is negatively charged;
extracellular solution has ZERO net potential
Which of these ions are the smallest in size?
o Sodium
o Potassium
o Chloride
- Sodium b/c it is a cation so Na+ loses an electron. Bigger than K+ due to periodic
trend, and Cl- since it's an anion (Na+ --> Neon, minus 1 proton)
What information about an axon is required to calculate the current associated with an NCV
pulse?
o Conductivity, resistivity, and length
o B.Potential, conductivity, and radius
o C.Potential, resistivity, and radius
o D.Potential, resistance per unit length, and length
- D- I= V/R, to calculate R (resistance), one needs to know the length and cross-
sectional area (resistance per unit length)
Squalene is produced in the human body as a precursor to which important class of
compounds?
o Triacyl glycerols
o Phospholipids
o Steroid hormones
o Prostaglandins
- Steroid hormones
- -fused ring system is similar in structure to cholesterol and all steroid hormones
What is the concentration of Cl- ions in a 0.1 M solution of calcium chloride?
o 0.02 M
o 0.05 M
o 0.10 M
o 0.20 M
, - 0.20M b/c the formula is CaCl2, so there are twice as many Cl- ions as Calcium->
(0.1M)*2= 0.20M
Hemiacetal Functional Group
o -Ring-opening can occur here
o -Reducing sugars
The y-intercept of a Lineweaver-Burk plot is equivalent to?
o 1/Vmax
What is a Reducing Agent?
- loses electrons and is oxidized in a chemical reaction
NADPH + H+ + O2 + RH -> NADP+ + H2O + ROH
In this reaction, NADPH functions as...
o oxidizing agent
o reducing agent
o catalyst
o electrophile
- B: reducing agent
- NADPH is acting as a hydride transfer agent which reduce oxygen
- NADPH loses electrons and is oxidized so it serves as a reducing agent
When is equilibrium reached for air pressure?
o When the sum of inside air pressure + liquid air pressure= outside air pressure
The average human body contains approximately 5 liters of blood. If the blood has a density of
1060 kg/m3, what is the total mass of blood in the average human? (Note: 1 L = 1000 cm3.)
o 0.212 kg
o 0.530 kg
o 5.30 kg
o 10.6 kg
- 5.30 kg
- m = ρV = 1060 kg/m3 × 5 L × 1000 cm3/L × 1 m3/106 cm3 = 5.30 kg.
- Recall that 1m= 100cm, so 1m^3= 1 x 10^6 cm^3), by taking 100 -> 1x 10^2
CUBED*
What is the Doppler effect?
SAMPLE
Which image best illustrates electric field lines between the inside of an axon and its
surrounding extracellular fluid?
o -Electric field lines exit from (+) and enter (-). The axon is negatively charged;
extracellular solution has ZERO net potential
Which of these ions are the smallest in size?
o Sodium
o Potassium
o Chloride
- Sodium b/c it is a cation so Na+ loses an electron. Bigger than K+ due to periodic
trend, and Cl- since it's an anion (Na+ --> Neon, minus 1 proton)
What information about an axon is required to calculate the current associated with an NCV
pulse?
o Conductivity, resistivity, and length
o B.Potential, conductivity, and radius
o C.Potential, resistivity, and radius
o D.Potential, resistance per unit length, and length
- D- I= V/R, to calculate R (resistance), one needs to know the length and cross-
sectional area (resistance per unit length)
Squalene is produced in the human body as a precursor to which important class of
compounds?
o Triacyl glycerols
o Phospholipids
o Steroid hormones
o Prostaglandins
- Steroid hormones
- -fused ring system is similar in structure to cholesterol and all steroid hormones
What is the concentration of Cl- ions in a 0.1 M solution of calcium chloride?
o 0.02 M
o 0.05 M
o 0.10 M
o 0.20 M
, - 0.20M b/c the formula is CaCl2, so there are twice as many Cl- ions as Calcium->
(0.1M)*2= 0.20M
Hemiacetal Functional Group
o -Ring-opening can occur here
o -Reducing sugars
The y-intercept of a Lineweaver-Burk plot is equivalent to?
o 1/Vmax
What is a Reducing Agent?
- loses electrons and is oxidized in a chemical reaction
NADPH + H+ + O2 + RH -> NADP+ + H2O + ROH
In this reaction, NADPH functions as...
o oxidizing agent
o reducing agent
o catalyst
o electrophile
- B: reducing agent
- NADPH is acting as a hydride transfer agent which reduce oxygen
- NADPH loses electrons and is oxidized so it serves as a reducing agent
When is equilibrium reached for air pressure?
o When the sum of inside air pressure + liquid air pressure= outside air pressure
The average human body contains approximately 5 liters of blood. If the blood has a density of
1060 kg/m3, what is the total mass of blood in the average human? (Note: 1 L = 1000 cm3.)
o 0.212 kg
o 0.530 kg
o 5.30 kg
o 10.6 kg
- 5.30 kg
- m = ρV = 1060 kg/m3 × 5 L × 1000 cm3/L × 1 m3/106 cm3 = 5.30 kg.
- Recall that 1m= 100cm, so 1m^3= 1 x 10^6 cm^3), by taking 100 -> 1x 10^2
CUBED*
What is the Doppler effect?
