BIO 1010 PGCC EXAM 2 QUESTIONS WITH
ACCURATE ANSWERS RATED A+
What does the endosymbiosis theory explain - ANSWER The presence of mitochondria in
plant and animals cells
What change occurred in the relationship between the ancestral prokaryote and the
ancestral eukaryote - ANSWER The two cells became dependent upon one another for
survival.
What supports the theory of endosymbiosis? - ANSWER Prokaryotes, mitochondria and
chloroplast are similar in size, reproduce by fission, have circular DNA and all have
similar ribosomes.
What are the functions of the plasma membrane? - ANSWER It holds contents of cell in
place, takes in food and nutrients, builds and exports molecules, and absorbs and
dissipates heat.
What occurs when phospholipids are mixed with water? - ANSWER The hydrophobic
tails point inward to avoid interacting with water molecules.
What is the function of recognition proteins? - ANSWER fingerprint
How do recognition proteins help protect against foreign objects? - ANSWER They help
the immune system to identify foreign objects.
Without transport proteins what would not occur? - ANSWER the passage of large or
strongly charged molecules through the membrane
What is the function of enzymatic proteins? - ANSWER to accelerate chemical reactions
, How do receptor proteins regulate cellular responses? - ANSWER They allow molecules
outside the cell to bind to the membrane and cause a response in the cell.
What cellular structure makes it possible for a cell to differ structurally and
biochemically from its surroundings? - ANSWER plasma membrane
The role of cholesterol in plasma membrane of animal cells is to: - ANSWER keep the
plasma membrane flexible, especially at low temperatures.
The function of cholesterol in membranes is: - ANSWER to reduce membrane fluidity at
higher temperatures.
Passive transport includes - ANSWER simple diffusion, facilitated diffusion, osmosis
Simple diffusion - ANSWER equalizes concentration on both sides of the membrane
facilitated diffusion - ANSWER Moves large or polar molecules across the plasma
membrane
Osmosis - ANSWER diffusion of water across a selectively permeable membrane
Drinking a large amount of salt water can lead to - ANSWER making blood hypertonic to
the cells.
Water will move from distilled water into a limp celery stalk because - ANSWER the
distilled water is hypotonic to the celery
Primary active transport - ANSWER moves molecules from low concentration to high
concentration, uses ATP as the energy source for pumping and requires a transport
protein.
ACCURATE ANSWERS RATED A+
What does the endosymbiosis theory explain - ANSWER The presence of mitochondria in
plant and animals cells
What change occurred in the relationship between the ancestral prokaryote and the
ancestral eukaryote - ANSWER The two cells became dependent upon one another for
survival.
What supports the theory of endosymbiosis? - ANSWER Prokaryotes, mitochondria and
chloroplast are similar in size, reproduce by fission, have circular DNA and all have
similar ribosomes.
What are the functions of the plasma membrane? - ANSWER It holds contents of cell in
place, takes in food and nutrients, builds and exports molecules, and absorbs and
dissipates heat.
What occurs when phospholipids are mixed with water? - ANSWER The hydrophobic
tails point inward to avoid interacting with water molecules.
What is the function of recognition proteins? - ANSWER fingerprint
How do recognition proteins help protect against foreign objects? - ANSWER They help
the immune system to identify foreign objects.
Without transport proteins what would not occur? - ANSWER the passage of large or
strongly charged molecules through the membrane
What is the function of enzymatic proteins? - ANSWER to accelerate chemical reactions
, How do receptor proteins regulate cellular responses? - ANSWER They allow molecules
outside the cell to bind to the membrane and cause a response in the cell.
What cellular structure makes it possible for a cell to differ structurally and
biochemically from its surroundings? - ANSWER plasma membrane
The role of cholesterol in plasma membrane of animal cells is to: - ANSWER keep the
plasma membrane flexible, especially at low temperatures.
The function of cholesterol in membranes is: - ANSWER to reduce membrane fluidity at
higher temperatures.
Passive transport includes - ANSWER simple diffusion, facilitated diffusion, osmosis
Simple diffusion - ANSWER equalizes concentration on both sides of the membrane
facilitated diffusion - ANSWER Moves large or polar molecules across the plasma
membrane
Osmosis - ANSWER diffusion of water across a selectively permeable membrane
Drinking a large amount of salt water can lead to - ANSWER making blood hypertonic to
the cells.
Water will move from distilled water into a limp celery stalk because - ANSWER the
distilled water is hypotonic to the celery
Primary active transport - ANSWER moves molecules from low concentration to high
concentration, uses ATP as the energy source for pumping and requires a transport
protein.
