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BIOL 1001 REAL EXAM 2025 PRACTICE QUESTIONS
AND CORRECT ANSWERS/ BIOLOGY 1002 LSU PREP
WITH 130 EXAM PRACTICE QUESTIONS AND
CORRECT VERIFIED ANSWERS

The "heat" in chilli peppers is due to a molecule called capsaicin
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Predict the characteristics of the resulting individuals
...
What is the significance of this finding?
a) cysteine residues are required for the formation of a-helices and b-pleated sheets
b) it will be important to include cysteine in the diet of mice
c) cysteine residues are involved in disulfide bridges that help form tertiary structure
d) cysteine causes bends, or angles, to occur in the tertiary structure of proteins - CORRECT

ANSWER-c) cysteine residues are involved in disulfide bridges that help form tertiary structure
You are studying a protein that is shaped like a doughnut
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What is/are possible explanations for the greater length of these
polypeptides?
a) the ribosomes that function as free ribosomes function differently than ribosomes that are
attached to the endoplasmic reticulum
b) the 20 amino acids serve as a signal sequence that directs the forming polypeptide to the
endoplasmic reticulum, where they are cleaved off during processing
c) the 20 amino acid sequence helps the endoplasmic reticulum package these proteins for shipping
to the golgi
d) the protein has a different function in the cytosol than in the endoplasmic reticulum - CORRECT

ANSWER-b) the 20 amino acids serve as a signal sequence that directs the forming polypeptide to
the endoplasmic reticulum, where they are cleaved off during processing

Intercalated discs are cell-cell junctions found between cardiac muscle cells
...
This means:
a) an extension of smooth endoplasmic reticulum goes through the gap junction, making it
continuous from one cardiac muscle cell to the next
b) water and small ions can readily pass from one cardiac muscle cell to the next
c) the plasma membrane encompasses multiple cardiac muscle cells
d) RNA from one cardiac muscle cell can be transported into an adjacent cells through the gap
junction - CORRECT ANSWER-b) water and small ions can readily pass from one cardiac muscle
cell to the next

What mechanism is responsible for the movement generated by motor proteins?
a) it varies with the type of motor protein involved - myosin, kinesin, or dyenin
b) they "walk" down microtubules
c) they bind to components of the cytoskeleton
d) they change shape when they gain or lose a phosphate group or bind to ATP - CORRECT

ANSWER-a) it varies with the type of motor protein involved - myosin, kinesin, or dyenin
b) they "walk" down microtubules
d) they change shape when they gain or lose a phosphate group or bind to ATP

The fact that a single signal-receptor complex results in the activation of several second messenger
molecules enables the cell signal to be:
a) transmitted

b) reflected
c) altered
d) amplified - CORRECT ANSWER-d) amplified

A cell has enough available ATP to meet its needs for about 30 seconds
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Substrate level phosphorylation is seen in which metabolic pathways?
a) glycolysis
b) citric acid cycle
c) both glycolysis and citric acid cycle
d) electron transport chain - CORRECT ANSWER-c) both glycolysis and citric acid cycle

Glycolysis, an energy-generating metabolic pathway, takes place in the mitochondria of all cells
a) true
b) false - CORRECT ANSWER-b) false

Two ATP molecules are expended in the energy investment phase of glycolysis
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PFK is the glycolytic enzyme that phosphorylates fructose-1-phosphate and catalyses the
committed step in glycolysis
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How does this help the mitochondrion to produce energy?
a) the hydrogen ions (protons) are transferred to oxygen in an energy-releasing reaction
b) the translocation of protons sets up the electrochemical gradient that drives ATP synthesis in the
mitochondria
c) the protons pick up electrons from the electron transport chain on their way though the inner
mitochondrial membrane

d) the protons receive electrons from the NAD+ and FAD that are accepted by electrons in glycolysis
and the citric acid cycle - CORRECT ANSWER-b) the translocation of protons sets up the
electrochemical gradient that drives ATP synthesis in the mitochondria

Why are fermentation reactions important for cells?
a) they produce alcohol used in alcoholic beverages
b) they regenerate NAD+ so that glycolysis can continue
c) they utilise oxygen
d) they generate oxygen - CORRECT ANSWER-b) they regenerate NAD+ so that glycolysis can
continue

What is the function of NAD+ in glycolysis?
a) it serves as an electron carrier
b) it picks up oxygen
c) it serves as a catalyst
d) it serves as an energy source to begin the process - CORRECT ANSWER-a) it serves as an
electron carrier

It takes more energy to reduce NAD+ to NADH than to produce ATP by substrate level
phosphorylation
a) true
b) false - CORRECT ANSWER-a) true

If you isolated intact mitochondria and added ATP to the medium:
a) oxygen consumption by the mitochondria would increase
b) the acidity of the medium would increase
c) carbon dioxide consumption by the mitochondria would increase
d) carbon dioxide consumption by the mitochondria would decrease - CORRECT ANSWER-a)
oxygen consumption by the mitochondria would increase

C6H12O6 + 6O2 -> 6CO2 + 6H2O
Where is the majority of the water in this reaction produced?

a) glycolysis
b) citric acid cycle
c) fermentation
d) electron transport chain - CORRECT ANSWER-d) electron transport chain

The inner mitochondrial membrane:
a) contains permease channels that allow small ions and water to pass readily through the
membrane by simple diffusion
b) contains an active transport pump that pumps protons into the inner mitochondrial compartment
from the point of high concentration to a point of lower concentration
c) is virtually impermeable to hydrogen ions (protons)
d) contains enzymes for two of the chemical reactions that take place as part of glycolysis -

CORRECT ANSWER-c) is virtually impermeable to hydrogen ions (protons)
Which fetal germ layer gives rise to the brain?
a) mesoderm
b) ectoderm
c) epidermis
d) endoderm - CORRECT ANSWER-b) ectoderm

Which of the following is/are unique to animals?
a) cells that have mitochondria
b) the structural carbohydrate, chitin
c) neurons and a nervous system with muscular movement
d) heterotrophy
e) flagellated gametes - CORRECT ANSWER-c) neurons and a nervous system with muscular
movement

Which morphological trait evolved that eventually gave rise to the brain?
a) cephalisation
b) tissue
c) radial symmetry

d) coelom
e) protostome development - CORRECT ANSWER-a) cephalisation

An organism that exhibits cephalisation probably also:
a) is bilaterally symmetrical
b) has a hydrostatic skeleton
c) has a coelum
d) is segmented
e) is diploblastic - CORRECT ANSWER-a) is bilaterally symmetrical

Sexual reproduction results in offspring that are genetically diverse from their parent
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Which of the following could the spider population be experiencing?
a) disruptive selection
b) directional selection
c) stabilising selection
d) genetic drift
e) sexual selection - CORRECT ANSWER-a) disruptive selection

A farmer uses triazine herbicide to control pigweed in his field
...
Which of the expectations best describes this observation?
a) natural selection caused pigweed to mutate, creating a new triazine resistant species
b) triazine-resistant pigweed has less-efficient photosynthesis metabolism
c) only triazine-resistant weeds survived and reproduced, so each year more pigweed has triazine
resistant
d) triazine-resistant pigweed has more efficient photosynthesis metabolism - CORRECT

ANSWER-c) only triazine-resistant weeds survived and reproduced, so each year more pigweed
has triazine resistant

After the drought of 1977, researchers hypothesized that on Daphne Major, medium ground finches
with large, deep beaks survived better than those with smaller beaks did because they could more
easily crack and eat the tough Tribulus cistoides fruits
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cistoides fruits and would eat other seeds when offered a choice; and (2) food availability is the
primary limit on finch fitness on this new island
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A scientist studying these beetles
knows that their eggs hatch in early spring, the baby insects grow through the late spring and
summer, they lay eggs in the early fall, and die in the early winter
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Early in life the black and white winged beetles seem to be very similar in
number of mating events, eggs laid, and survival rates, but shortly after laying their eggs the white
beetles die and there are only black winged beetles during the late fall

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