PORTAGE BIOD 101 FINAL EXAM REVIEW GUIDE
QUESTIONS WITH ANSWERS AND EXPLANATIONS
Question 1.
Based on the mechanism of mitochondria, which outcome is most reasonable?
A. separating the strands exposes templates needed for replication or transcription
B. blocking ATP production eventually impairs many primary active transport processes
C. blocking the electron transport chain lowers aerobic ATP production and can increase
reliance on glycolysis
D. lack of oxygen halts terminal electron acceptance and reduces oxidative ATP production
Correct Answer: C. blocking the electron transport chain lowers aerobic ATP
production and can increase reliance on glycolysis
Explanation: For mitochondria, the scientifically correct choice is blocking the electron
transport chain lowers aerobic ATP production and can increase reliance on glycolysis. The
concept is based on the principle that double-membrane organelles use oxidative
metabolism to generate much of a eukaryotic cell's ATP and normally serves to couple
electron transport to oxidative phosphorylation and participate in metabolic signaling. The
other options describe different processes, whereas this concept matters because
mitochondrial function links oxygen use to efficient ATP generation.
Question 2.
Where would a student expect to identify the process or structure called glycolysis?
A. animals, plants, fungi, and protists are composed of eukaryotic cells
B. continuous with the nuclear envelope in the cytoplasm
C. where water can cross a membrane but relevant solutes are restricted
D. the cytosol of essentially all cells
Correct Answer: D. the cytosol of essentially all cells
Explanation: For glycolysis, the scientifically correct choice is the cytosol of essentially all
cells. The concept is based on the principle that a cytosolic pathway converts glucose to
pyruvate while generating ATP and NADH and normally serves to provide rapid
substrate-level phosphorylation and intermediates for metabolism. The other options
describe different processes, whereas this concept matters because glycolysis is the
common initial pathway for glucose catabolism.
Question 3.
Why is enzymes biologically important?
A. enzyme regulation permits metabolism to respond rapidly to cellular needs
B. natural selection explains adaptation without requiring purposeful change
C. the chain links nutrient oxidation to high-yield ATP production
D. glycolysis is the common initial pathway for glucose catabolism
Correct Answer: A. enzyme regulation permits metabolism to respond rapidly to
cellular needs
,Explanation: For enzymes, the scientifically correct choice is enzyme regulation permits
metabolism to respond rapidly to cellular needs. The concept is based on the principle that
biological catalysts lower activation energy without being consumed in the net reaction
and normally serves to accelerate specific chemical reactions and regulate metabolic
pathways. The other options describe different processes, whereas this concept matters
because enzyme regulation permits metabolism to respond rapidly to cellular needs.
Question 4.
Where would a student expect to identify the process or structure called nucleus?
A. glucose circulates in body fluids while glycogen is stored in animal cells
B. within the cytoplasm of most eukaryotic cells
C. across cellular membranes containing specific pumps or cotransporters
D. where water can cross a membrane but relevant solutes are restricted
Correct Answer: B. within the cytoplasm of most eukaryotic cells
Explanation: For nucleus, the scientifically correct choice is within the cytoplasm of most
eukaryotic cells. The concept is based on the principle that the nuclear envelope encloses
most cellular DNA and nuclear pores regulate traffic and normally serves to store the
genome and coordinate gene expression through transcriptional control. The other options
describe different processes, whereas this concept matters because nuclear organization
separates transcription from cytoplasmic translation.
Question 5.
Which differentiating statement about active transport is correct?
A. unlike active transport, simple diffusion does not move solute uphill or directly use ATP
B. energy flow is directional while matter such as carbon and nitrogen is recycled
C. unlike facilitated diffusion, active transport can produce net uphill movement
D. ATP is an immediate energy-transfer molecule rather than the main long-term energy
store
Correct Answer: C. unlike facilitated diffusion, active transport can produce net
uphill movement
Explanation: For active transport, the scientifically correct choice is unlike facilitated
diffusion, active transport can produce net uphill movement. The concept is based on the
principle that membrane proteins move substances against electrochemical gradients
using energy directly or indirectly and normally serves to establish and maintain ion and
nutrient gradients. The other options describe different processes, whereas this concept
matters because active transport is essential for membrane potential, nutrient uptake, and
homeostasis.
,Question 6.
Where would a student expect to identify the process or structure called nucleic acids?
A. DNA is concentrated in chromosomes while diverse RNAs function in nucleus and
cytoplasm
B. free in cytosol or bound to rough endoplasmic reticulum in eukaryotic cells
C. in cytosol, organelles, membranes, extracellular fluids, and digestive tracts
D. across membranes or through fluids where a concentration gradient exists
Correct Answer: A. DNA is concentrated in chromosomes while diverse RNAs
function in nucleus and cytoplasm
Explanation: For nucleic acids, the scientifically correct choice is DNA is concentrated in
chromosomes while diverse RNAs function in nucleus and cytoplasm. The concept is based
on the principle that DNA and RNA are polymers of nucleotides containing sugar,
phosphate, and nitrogenous bases and normally serves to store, transmit, and help
express genetic information. The other options describe different processes, whereas this
concept matters because nucleic acids provide heritable information and templates for
gene expression.
Question 7.
Which clarification about ATP is scientifically correct?
A. the two strands are not identical in sequence; they are complementary and antiparallel
B. a correlation alone does not prove causation and a control is not simply any unchanged
measurement
C. prokaryotic does not mean lacking genetic material or ribosomes
D. ATP is not stored in unlimited quantities for long-term energy reserves
Correct Answer: D. ATP is not stored in unlimited quantities for long-term
energy reserves
Explanation: For ATP, the scientifically correct choice is ATP is not stored in unlimited
quantities for long-term energy reserves. The concept is based on the principle that
adenosine triphosphate transfers usable chemical energy through phosphate-group
reactions and normally serves to couple energy-releasing processes to cellular work. The
other options describe different processes, whereas this concept matters because ATP
couples catabolism to biosynthesis, transport, and mechanical work.
Question 8.
Where would a student expect to identify the process or structure called transcription?
A. laboratory and field experiments designed to test hypotheses
B. the nucleus for most eukaryotic nuclear genes
C. primarily in the nucleus of eukaryotic cells during S phase
D. glucose circulates in body fluids while glycogen is stored in animal cells
Correct Answer: B. the nucleus for most eukaryotic nuclear genes
, Explanation: For transcription, the scientifically correct choice is the nucleus for most
eukaryotic nuclear genes. The concept is based on the principle that RNA polymerase uses
a DNA template to synthesize RNA and normally serves to produce mRNA and other RNAs
according to regulated gene expression. The other options describe different processes,
whereas this concept matters because transcription is a major control point between
genotype and cellular phenotype.
Question 9.
In which setting does mitochondria normally occur?
A. free in cytosol or bound to rough endoplasmic reticulum in eukaryotic cells
B. glucose circulates in body fluids while glycogen is stored in animal cells
C. throughout the cytoplasm with an inner membrane folded into cristae
D. continuous with the nuclear envelope in the cytoplasm
Correct Answer: C. throughout the cytoplasm with an inner membrane folded
into cristae
Explanation: For mitochondria, the scientifically correct choice is throughout the
cytoplasm with an inner membrane folded into cristae. The concept is based on the
principle that double-membrane organelles use oxidative metabolism to generate much of
a eukaryotic cell's ATP and normally serves to couple electron transport to oxidative
phosphorylation and participate in metabolic signaling. The other options describe
different processes, whereas this concept matters because mitochondrial function links
oxygen use to efficient ATP generation.
Question 10.
A student is summarizing nucleic acids. Which statement is most accurate?
A. DNA and RNA are polymers of nucleotides containing sugar, phosphate, and
nitrogenous bases
B. a selectively permeable phospholipid bilayer contains proteins, cholesterol, and
carbohydrates
C. adenosine triphosphate transfers usable chemical energy through phosphate-group
reactions
D. electron carriers in the inner mitochondrial membrane transfer electrons and pump
protons
Correct Answer: A. DNA and RNA are polymers of nucleotides containing sugar,
phosphate, and nitrogenous bases
Explanation: For nucleic acids, the scientifically correct choice is DNA and RNA are
polymers of nucleotides containing sugar, phosphate, and nitrogenous bases. The concept
is based on the principle that DNA and RNA are polymers of nucleotides containing sugar,
phosphate, and nitrogenous bases and normally serves to store, transmit, and help
express genetic information. The other options describe different processes, whereas this
concept matters because nucleic acids provide heritable information and templates for
gene expression.
QUESTIONS WITH ANSWERS AND EXPLANATIONS
Question 1.
Based on the mechanism of mitochondria, which outcome is most reasonable?
A. separating the strands exposes templates needed for replication or transcription
B. blocking ATP production eventually impairs many primary active transport processes
C. blocking the electron transport chain lowers aerobic ATP production and can increase
reliance on glycolysis
D. lack of oxygen halts terminal electron acceptance and reduces oxidative ATP production
Correct Answer: C. blocking the electron transport chain lowers aerobic ATP
production and can increase reliance on glycolysis
Explanation: For mitochondria, the scientifically correct choice is blocking the electron
transport chain lowers aerobic ATP production and can increase reliance on glycolysis. The
concept is based on the principle that double-membrane organelles use oxidative
metabolism to generate much of a eukaryotic cell's ATP and normally serves to couple
electron transport to oxidative phosphorylation and participate in metabolic signaling. The
other options describe different processes, whereas this concept matters because
mitochondrial function links oxygen use to efficient ATP generation.
Question 2.
Where would a student expect to identify the process or structure called glycolysis?
A. animals, plants, fungi, and protists are composed of eukaryotic cells
B. continuous with the nuclear envelope in the cytoplasm
C. where water can cross a membrane but relevant solutes are restricted
D. the cytosol of essentially all cells
Correct Answer: D. the cytosol of essentially all cells
Explanation: For glycolysis, the scientifically correct choice is the cytosol of essentially all
cells. The concept is based on the principle that a cytosolic pathway converts glucose to
pyruvate while generating ATP and NADH and normally serves to provide rapid
substrate-level phosphorylation and intermediates for metabolism. The other options
describe different processes, whereas this concept matters because glycolysis is the
common initial pathway for glucose catabolism.
Question 3.
Why is enzymes biologically important?
A. enzyme regulation permits metabolism to respond rapidly to cellular needs
B. natural selection explains adaptation without requiring purposeful change
C. the chain links nutrient oxidation to high-yield ATP production
D. glycolysis is the common initial pathway for glucose catabolism
Correct Answer: A. enzyme regulation permits metabolism to respond rapidly to
cellular needs
,Explanation: For enzymes, the scientifically correct choice is enzyme regulation permits
metabolism to respond rapidly to cellular needs. The concept is based on the principle that
biological catalysts lower activation energy without being consumed in the net reaction
and normally serves to accelerate specific chemical reactions and regulate metabolic
pathways. The other options describe different processes, whereas this concept matters
because enzyme regulation permits metabolism to respond rapidly to cellular needs.
Question 4.
Where would a student expect to identify the process or structure called nucleus?
A. glucose circulates in body fluids while glycogen is stored in animal cells
B. within the cytoplasm of most eukaryotic cells
C. across cellular membranes containing specific pumps or cotransporters
D. where water can cross a membrane but relevant solutes are restricted
Correct Answer: B. within the cytoplasm of most eukaryotic cells
Explanation: For nucleus, the scientifically correct choice is within the cytoplasm of most
eukaryotic cells. The concept is based on the principle that the nuclear envelope encloses
most cellular DNA and nuclear pores regulate traffic and normally serves to store the
genome and coordinate gene expression through transcriptional control. The other options
describe different processes, whereas this concept matters because nuclear organization
separates transcription from cytoplasmic translation.
Question 5.
Which differentiating statement about active transport is correct?
A. unlike active transport, simple diffusion does not move solute uphill or directly use ATP
B. energy flow is directional while matter such as carbon and nitrogen is recycled
C. unlike facilitated diffusion, active transport can produce net uphill movement
D. ATP is an immediate energy-transfer molecule rather than the main long-term energy
store
Correct Answer: C. unlike facilitated diffusion, active transport can produce net
uphill movement
Explanation: For active transport, the scientifically correct choice is unlike facilitated
diffusion, active transport can produce net uphill movement. The concept is based on the
principle that membrane proteins move substances against electrochemical gradients
using energy directly or indirectly and normally serves to establish and maintain ion and
nutrient gradients. The other options describe different processes, whereas this concept
matters because active transport is essential for membrane potential, nutrient uptake, and
homeostasis.
,Question 6.
Where would a student expect to identify the process or structure called nucleic acids?
A. DNA is concentrated in chromosomes while diverse RNAs function in nucleus and
cytoplasm
B. free in cytosol or bound to rough endoplasmic reticulum in eukaryotic cells
C. in cytosol, organelles, membranes, extracellular fluids, and digestive tracts
D. across membranes or through fluids where a concentration gradient exists
Correct Answer: A. DNA is concentrated in chromosomes while diverse RNAs
function in nucleus and cytoplasm
Explanation: For nucleic acids, the scientifically correct choice is DNA is concentrated in
chromosomes while diverse RNAs function in nucleus and cytoplasm. The concept is based
on the principle that DNA and RNA are polymers of nucleotides containing sugar,
phosphate, and nitrogenous bases and normally serves to store, transmit, and help
express genetic information. The other options describe different processes, whereas this
concept matters because nucleic acids provide heritable information and templates for
gene expression.
Question 7.
Which clarification about ATP is scientifically correct?
A. the two strands are not identical in sequence; they are complementary and antiparallel
B. a correlation alone does not prove causation and a control is not simply any unchanged
measurement
C. prokaryotic does not mean lacking genetic material or ribosomes
D. ATP is not stored in unlimited quantities for long-term energy reserves
Correct Answer: D. ATP is not stored in unlimited quantities for long-term
energy reserves
Explanation: For ATP, the scientifically correct choice is ATP is not stored in unlimited
quantities for long-term energy reserves. The concept is based on the principle that
adenosine triphosphate transfers usable chemical energy through phosphate-group
reactions and normally serves to couple energy-releasing processes to cellular work. The
other options describe different processes, whereas this concept matters because ATP
couples catabolism to biosynthesis, transport, and mechanical work.
Question 8.
Where would a student expect to identify the process or structure called transcription?
A. laboratory and field experiments designed to test hypotheses
B. the nucleus for most eukaryotic nuclear genes
C. primarily in the nucleus of eukaryotic cells during S phase
D. glucose circulates in body fluids while glycogen is stored in animal cells
Correct Answer: B. the nucleus for most eukaryotic nuclear genes
, Explanation: For transcription, the scientifically correct choice is the nucleus for most
eukaryotic nuclear genes. The concept is based on the principle that RNA polymerase uses
a DNA template to synthesize RNA and normally serves to produce mRNA and other RNAs
according to regulated gene expression. The other options describe different processes,
whereas this concept matters because transcription is a major control point between
genotype and cellular phenotype.
Question 9.
In which setting does mitochondria normally occur?
A. free in cytosol or bound to rough endoplasmic reticulum in eukaryotic cells
B. glucose circulates in body fluids while glycogen is stored in animal cells
C. throughout the cytoplasm with an inner membrane folded into cristae
D. continuous with the nuclear envelope in the cytoplasm
Correct Answer: C. throughout the cytoplasm with an inner membrane folded
into cristae
Explanation: For mitochondria, the scientifically correct choice is throughout the
cytoplasm with an inner membrane folded into cristae. The concept is based on the
principle that double-membrane organelles use oxidative metabolism to generate much of
a eukaryotic cell's ATP and normally serves to couple electron transport to oxidative
phosphorylation and participate in metabolic signaling. The other options describe
different processes, whereas this concept matters because mitochondrial function links
oxygen use to efficient ATP generation.
Question 10.
A student is summarizing nucleic acids. Which statement is most accurate?
A. DNA and RNA are polymers of nucleotides containing sugar, phosphate, and
nitrogenous bases
B. a selectively permeable phospholipid bilayer contains proteins, cholesterol, and
carbohydrates
C. adenosine triphosphate transfers usable chemical energy through phosphate-group
reactions
D. electron carriers in the inner mitochondrial membrane transfer electrons and pump
protons
Correct Answer: A. DNA and RNA are polymers of nucleotides containing sugar,
phosphate, and nitrogenous bases
Explanation: For nucleic acids, the scientifically correct choice is DNA and RNA are
polymers of nucleotides containing sugar, phosphate, and nitrogenous bases. The concept
is based on the principle that DNA and RNA are polymers of nucleotides containing sugar,
phosphate, and nitrogenous bases and normally serves to store, transmit, and help
express genetic information. The other options describe different processes, whereas this
concept matters because nucleic acids provide heritable information and templates for
gene expression.
