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BIO 1100 EXAM 1
VERIFIED ANSWERS
LATEST 2026/2027
WHAT TO FIND IN THIS EXAM
MULTICHOICE QUESTIONS WITH ANSWERS
BUTTERFLY QUESTION WITH ANSWERS
WELL, EXPLAINED ANSWER
,2026/2027 Frequently Most Tested Questions and 100%
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Updated | 100% Guarantee Pass | Latest Exam and Newest
Version!!!
Organisms on Earth are composed of molecules and compounds that are constructed
primarily of what four elements?
a. Carbon, Hydrogen, Oxygen, Nitrogen
b. Carbon, Hydrogen, Oxygen, Sulfur
c. Carbon, Nitrogen, Oxygen, Phosphorus
d. Carbon, Hydrogen, Nitrogen, Phosphorus
✔️ Correct Answer: A
Rationale:
Living organisms are primarily composed of four elements: carbon, hydrogen, oxygen,
and nitrogen (Option A). These elements make up approximately 96% of the mass of
living organisms. Carbon forms the backbone of organic molecules, hydrogen and
oxygen are components of water and organic compounds, and nitrogen is essential for
proteins and nucleic acids. Other elements such as phosphorus and sulfur are also
important but are present in smaller amounts.
A potential new organism has been discovered. Which of the following would be the
most conclusive in confirming it is a life form?
a. Detection of DNA
b. Detection of cells
c. Detection of proteins
d. Detection of movement
✔️ Correct Answer: B
Rationale:
The most conclusive evidence that something is a life form is the detection of cells
(Option B). Cells are the basic structural and functional units of all known living
organisms. While DNA, proteins, and movement are associated with life, they are not
definitive on their own. Viruses contain DNA or RNA and proteins but are not considered
,2026/2027 Frequently Most Tested Questions and 100%
Accurate From Past papers | Graded A+ , Reviewed and
Updated | 100% Guarantee Pass | Latest Exam and Newest
Version!!!
living organisms because they lack cells. The cell theory states that all living organisms
are composed of cells.
Which of the following intracellular junctions would allow for signal molecules to be
passed between adjacent animal cells that need fast communication like heart and nerve
cells?
a. Tight junctions
b. Desmosomes
c. Gap junctions
d. Plasmodesmata
✔️ Correct Answer: C
Rationale:
Gap junctions allow for signal molecules to be passed between adjacent animal cells
(Option C). These junctions are channels that connect the cytoplasm of adjacent cells,
allowing for the direct passage of ions, small molecules, and electrical signals. This
enables rapid communication between cells, which is essential for the coordinated
function of heart muscle cells and nerve cells.
Option A is incorrect because tight junctions form watertight seals between cells and
prevent the passage of materials between them. Option B is incorrect because
desmosomes provide mechanical strength by anchoring cells together but do not allow
for intercellular communication. Option D is incorrect because plasmodesmata are found
in plant cells, not animal cells.
Endosymbiosis is the best explanation for:
a. The appearance of mitochondria and chloroplasts in eukaryotes
b. The origin of the nucleus
, 2026/2027 Frequently Most Tested Questions and 100%
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Updated | 100% Guarantee Pass | Latest Exam and Newest
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c. The development of multicellular organisms
d. The formation of cell membranes
✔️ Correct Answer: A
Rationale:
Endosymbiosis is the best explanation for the appearance of mitochondria and
chloroplasts in eukaryotes (Option A). The endosymbiotic theory proposes that
mitochondria and chloroplasts originated from free-living prokaryotic organisms that
were engulfed by ancestral eukaryotic cells. These prokaryotes developed a symbiotic
relationship with the host cell, eventually becoming permanent organelles. Evidence
includes the presence of their own DNA, ribosomes, and double membranes.
Option B is incorrect because the nucleus is thought to have originated through
infolding of the plasma membrane, not endosymbiosis. Option C is incorrect because
multicellularity developed through other evolutionary processes. Option D is incorrect
because cell membranes are fundamental structures that existed before endosymbiosis.
Food enters your mouth and reaches your small intestine. What chemical process uses
water to break down polymers into smaller more bioavailable chemical subunits?
a. Dehydration synthesis
b. Hydrolysis
c. Condensation
d. Oxidation
✔️ Correct Answer: B
Rationale:
Hydrolysis is the chemical process that uses water to break down polymers into smaller
subunits (Option B). During digestion, hydrolysis reactions break the bonds between
monomers in polymers such as proteins, polysaccharides, and nucleic acids. Water
molecules are consumed in these reactions, splitting the polymer into smaller, more
bioavailable molecules that can be absorbed by the body.
Accurate From Past papers | Graded A+ , Reviewed and
Updated | 100% Guarantee Pass | Latest Exam and Newest
Version!!!
BIO 1100 EXAM 1
VERIFIED ANSWERS
LATEST 2026/2027
WHAT TO FIND IN THIS EXAM
MULTICHOICE QUESTIONS WITH ANSWERS
BUTTERFLY QUESTION WITH ANSWERS
WELL, EXPLAINED ANSWER
,2026/2027 Frequently Most Tested Questions and 100%
Accurate From Past papers | Graded A+ , Reviewed and
Updated | 100% Guarantee Pass | Latest Exam and Newest
Version!!!
Organisms on Earth are composed of molecules and compounds that are constructed
primarily of what four elements?
a. Carbon, Hydrogen, Oxygen, Nitrogen
b. Carbon, Hydrogen, Oxygen, Sulfur
c. Carbon, Nitrogen, Oxygen, Phosphorus
d. Carbon, Hydrogen, Nitrogen, Phosphorus
✔️ Correct Answer: A
Rationale:
Living organisms are primarily composed of four elements: carbon, hydrogen, oxygen,
and nitrogen (Option A). These elements make up approximately 96% of the mass of
living organisms. Carbon forms the backbone of organic molecules, hydrogen and
oxygen are components of water and organic compounds, and nitrogen is essential for
proteins and nucleic acids. Other elements such as phosphorus and sulfur are also
important but are present in smaller amounts.
A potential new organism has been discovered. Which of the following would be the
most conclusive in confirming it is a life form?
a. Detection of DNA
b. Detection of cells
c. Detection of proteins
d. Detection of movement
✔️ Correct Answer: B
Rationale:
The most conclusive evidence that something is a life form is the detection of cells
(Option B). Cells are the basic structural and functional units of all known living
organisms. While DNA, proteins, and movement are associated with life, they are not
definitive on their own. Viruses contain DNA or RNA and proteins but are not considered
,2026/2027 Frequently Most Tested Questions and 100%
Accurate From Past papers | Graded A+ , Reviewed and
Updated | 100% Guarantee Pass | Latest Exam and Newest
Version!!!
living organisms because they lack cells. The cell theory states that all living organisms
are composed of cells.
Which of the following intracellular junctions would allow for signal molecules to be
passed between adjacent animal cells that need fast communication like heart and nerve
cells?
a. Tight junctions
b. Desmosomes
c. Gap junctions
d. Plasmodesmata
✔️ Correct Answer: C
Rationale:
Gap junctions allow for signal molecules to be passed between adjacent animal cells
(Option C). These junctions are channels that connect the cytoplasm of adjacent cells,
allowing for the direct passage of ions, small molecules, and electrical signals. This
enables rapid communication between cells, which is essential for the coordinated
function of heart muscle cells and nerve cells.
Option A is incorrect because tight junctions form watertight seals between cells and
prevent the passage of materials between them. Option B is incorrect because
desmosomes provide mechanical strength by anchoring cells together but do not allow
for intercellular communication. Option D is incorrect because plasmodesmata are found
in plant cells, not animal cells.
Endosymbiosis is the best explanation for:
a. The appearance of mitochondria and chloroplasts in eukaryotes
b. The origin of the nucleus
, 2026/2027 Frequently Most Tested Questions and 100%
Accurate From Past papers | Graded A+ , Reviewed and
Updated | 100% Guarantee Pass | Latest Exam and Newest
Version!!!
c. The development of multicellular organisms
d. The formation of cell membranes
✔️ Correct Answer: A
Rationale:
Endosymbiosis is the best explanation for the appearance of mitochondria and
chloroplasts in eukaryotes (Option A). The endosymbiotic theory proposes that
mitochondria and chloroplasts originated from free-living prokaryotic organisms that
were engulfed by ancestral eukaryotic cells. These prokaryotes developed a symbiotic
relationship with the host cell, eventually becoming permanent organelles. Evidence
includes the presence of their own DNA, ribosomes, and double membranes.
Option B is incorrect because the nucleus is thought to have originated through
infolding of the plasma membrane, not endosymbiosis. Option C is incorrect because
multicellularity developed through other evolutionary processes. Option D is incorrect
because cell membranes are fundamental structures that existed before endosymbiosis.
Food enters your mouth and reaches your small intestine. What chemical process uses
water to break down polymers into smaller more bioavailable chemical subunits?
a. Dehydration synthesis
b. Hydrolysis
c. Condensation
d. Oxidation
✔️ Correct Answer: B
Rationale:
Hydrolysis is the chemical process that uses water to break down polymers into smaller
subunits (Option B). During digestion, hydrolysis reactions break the bonds between
monomers in polymers such as proteins, polysaccharides, and nucleic acids. Water
molecules are consumed in these reactions, splitting the polymer into smaller, more
bioavailable molecules that can be absorbed by the body.
