Plasma Membrane
What is the primary function of the plasma membrane?
A) Produce energy
B) Control what enters and leaves the cell
C) Store genetic information
D) Break down food molecules
B) Control what enters and leaves the cell
Glycolysis occurs in the:
A) Mitochondria
B) Cytoplasm
C) Nucleus
D) Chloroplast
B) Cytoplasm
Each turn of the cycle produces:
A) 3 NADH, 1 FADH₂, 1 ATP, 2 CO₂
B) 2 ATP
C) 2 NADH
D) 3 ATP
A) 3 NADH, 1 FADH₂, 1 ATP, 2 CO₂
The Krebs cycle occurs in the:
A) Cytoplasm
B) Mitochondrial matrix
C) Nucleus
D) Membrane
B) Mitochondrial matrix
What provides electrons to the ETC?
A) Glucose
B) NADH and FADH₂
C) CO₂
D) Water
B) NADH and FADH₂
The phospholipid bilayer has:
A) Two layers of proteins
B) A hydrophobic head and hydrophilic tail
C) Hydrophilic heads and hydrophobic tails
D) Only one lipid layer
C) Hydrophilic heads and hydrophobic tails
Glycolysis converts glucose into:
A) Two pyruvate molecules
B) Carbon dioxide
C) Two acetyl-CoA
D) Water
A) Two pyruvate molecules
Before entering the cycle, pyruvate is converted to:
A) Lactic acid
B) Acetyl-CoA
C) Glucose
D) ATP
B) Acetyl-CoA
The ETC occurs in the:
A) Cytoplasm
B) Inner mitochondrial membrane
C) Matrix
D) Outer membrane
B) Inner mitochondrial membrane
Oxygen acts as the:
A) First electron carrier
B) Final electron acceptor
C) Proton donor
D) ATP synthase
B) Final electron acceptor
Which molecule helps the membrane maintain fluidity?
A) Cholesterol
B) Glucose
C) ATP
D) Enzyme
A) Cholesterol
Which statement is true?
A) Glycolysis needs mitochondria
B) Glycolysis produces oxygen
C) Glycolysis is the first stage of cellular respiration
D) Glycolysis uses carbon dioxide
C) Glycolysis is the first stage of cellular respiration
The first molecule formed is:
A) Citric acid (citrate)
B) NADH
C) ATP
D) Carbon dioxide
A) Citric acid (citrate)
Hydrogen ions accumulate in the:
A) Matrix
B) Intermembrane space
C) Cytoplasm
D) Outer layer
B) Intermembrane space
ATP synthase makes ATP using:
A) Carbon dioxide
B) Proton gradient
C) Glucose energy
D) Pyruvate
B) Proton gradient
The polar heads of phospholipids are:
A) Water-repelling
B) Water-attracting
C) Neutral
D) Fat-based
B) Water-attracting
What compound accepts electrons in glycolysis?
A) NAD⁺
B) ATP
C) ADP
D) FAD
A) NAD⁺
The main purpose of the Krebs cycle is to:
A) Produce large amounts of ATP directly
B) Generate electron carriers NADH and FADH₂
C) Create glucose
D) Store carbon
B) Generate electron carriers NADH and FADH₂
The electron carrier proteins are arranged in:
A) The cytoplasm
B) A chain of membrane proteins
C) Random clusters
D) The outer membrane only
B) A chain of membrane proteins
What ions move through ATP synthase?
A) Sodium
B) Chloride
C) Hydrogen (H⁺)
D) Potassium
C) Hydrogen (H⁺)
What structure helps cells recognize each other?
A) Glycoprotein
B) Mitochondria
C) Ribosome
D) DNA
A) Glycoprotein
Which is not a product of glycolysis?
A) NADH
B) Pyruvate
C) CO₂
D) ATP
C) CO₂
Which molecule starts and ends the cycle?
A) Glucose
B) Oxaloacetate
C) Acetyl-CoA
D) Citrate
B) Oxaloacetate
The pressure gradient that was created by the imbedded complexes is relieved by the ATP synthase pumping protons into this space of the mitochondrial space.
Matrix
The electrons from FADH₂ enter:
A) Earlier than NADH
B) Later than NADH
C) At the same point
D) Directly to oxygen
B) Later than NADH