BIOL 1107 Final Exam (Answered) Complete Verified Solution 100%
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BIOL 1107
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BIOL 1107
BIOL 1107 Final Exam (Answered) Complete Verified Solution 100%
The interior region of a phospholipid bilayer is characterized as:
Hydrophobic
The movement of water across a cell plasma membrane into or out of a cell is an example of:
Both osmosis and diffusion.
In the example of secondary a...
BIOL 1107 Final Exam (Answered)
Complete Verified Solution 100%
The interior region of a phospholipid bilayer is characterized as:
Hydrophobic
The movement of water across a cell plasma membrane into or out of a cell is an
example of:
Both osmosis and diffusion.
In the example of secondary active transport, what would happen if ATP suddenly
became unavailable for Step 1 in Panel a. of the figure shown?
The movement of the molecules through the anti-porter would continue for a while until
the proton gradient was depleted.
A phospholipid molecule in a membrane can:
Both spin (rotate around its vertical axis) and move side-to-side (lateral movement).
A protein that is temporarily associated with a biological membrane is a(n):
Peripheral membrane protein
Predict how phospholipids would arrange if they were placed in a non-polar
solution rather than a polar solution like water:
The phospholipid tails would orient toward the solution, and the heads would cluster
away from the solution.
Which type of fatty acids would be likely to participate in the greatest amount of
van der Waals forces with other fatty acids? Fatty acids with:
Long tails and high saturation.
Considering the amino acids that are found in various domains of
transmembrane proteins, which statement would be true?
Non-polar amino acids would be prevalent in the transmembrane domain, in contact
with the environment of the inner membrane.
When we say that the cell is the fundamental unit of life, we mean that:
(All of these choices are correct). All living things are made up of one or more cells. The
smallest entity that can be considered living is a cell. A single cell can carry out all life
processes. Life doesn't exist in the absence of cells.
Why does active transport of molecules across a membrane require ATP?
An input of energy is needed to allow the movement of molecules from an area of low
concentration to an area of higher concentration.
In general, colder temperatures would tend to reduce the fluidity of membranes.
In response, cells can adjust the composition of their membranes to maintain the
proper degree of fluidity. How would the membrane change in response to colder
temperatures?
The amount of unsaturated triacylglycerols would increase.
Which of the statements represents the flow of information as described by the
central dogma of molecular biology?
Information in DNA is transcribed into RNA, which carries the information to make
protein.
,Which one of the nucleotides could base pair with a pyrimidine?
Adenine
A boy observes a robin outside of his window, he notices the robin repeatedly
cocks its head to one side before pecking the ground. The boy suspects that
when the robin cocks its head it is actually listening for worms or insects
underground. His explanation of the bird's behavior is an example of:
A hypothesis.
Sort the following molecules by how easily they pass through the plasma
membrane from most permeable to least permeable.
CO2, H2O, C6H12O6, NA+
Samples of three different triacylglycerols were tested to determine the melting
point of each one. The length of the fatty acids in A, B, and C is the same. Which
of the three fatty acids is likely to have the most unsaturated fatty acids?
Type 1
The three main groups, or domains, of organisms are:
Bacteria, archaea, and eukarya.
How many water molecules would be produced in making a polypeptide that is 14
amino acids long?
13
In general, colder temperatures reduce the fluidity of the membrane, so cells will
produce different molecules to maintain the proper degree of fluidity. How would
the membrane change in response to colder temperatures to maintain
homeostasis and restore the proper degree of fluidity?
The amount of unsaturated triacylglycerols in the phospholipids would increase.
Paramecium is a unicellular organism that lives in fresh water. Suppose you are
studying two populations of this organism: one population lives in a pond in
northern Ontario, Canada, and the other lives in a pond in southern Florida. If you
examined the plasma membranes of both of these populations at the same time
of year, what difference would you expect to find between the two populations'
cell membranes?
The fatty acid side chains in the membrane phospholipids of the Florida Paramecia
would generally be longer and would be more saturated compared to the Canada
Paramecia.
The ACE-2 receptor that binds to the SARS-CoV-2 virus is a transmembrane
receptor. The amino acid sequence of this reveals a polypeptide chain that has
one hydrophobic region. Based on this information, what can you conclude about
how the protein is associated?
The receptor is likely to span the membrane one time.
How many hydrogen atoms are present in a hydrocarbon chain of five atoms
joined to each other by single covalent bonds?
12
What is pumped across the lysosomal membrane by a transport protein to create
a special internal environment in the lysosome?
H+
Samples of three different triacylglycerols were tested to
determine the melting point of each one. The number of double bonds in each of
, the fatty acids A, B, and C is the same. Which of the fatty acids is likely to have
the most saturated fatty acids?
Type 2.
Which choice most accurately describes the ratio of oxygen to carbon to
hydrogen in a simple 6-carbon sugar such as glucose?
1:2:1
Disorders of which organelle are often associated with defects in transport from
compartment to compartment, resulting in poor sorting of protein components
within the cell?
Golgi apparatus.
A phosphodiester bond is formed between:
A 5' phosphate and a 3' hydroxyl group of two nucleotides.
Which substance could most easily cross a synthetic membrane composed of
only phospholipids?
Oxygen
Which feature of glycosaminoglycans best relates to its function?
GAGs consist of multiple carbohydrate molecules that are negatively charged.
The plasma membranes of some plant cells use transport proteins to move
protons out of the cell against their concentration gradient. This is an example of:
Active transport.
Refer to the image. The molecule shown here is:
An amino acid.
How do cells connect to the extracellular matrix?
Integrins
Which actions would affect the secondary structure of a protein?
Breaking the hydrogen and ionic bonds between amino acids.
Some plant cells use ATP to create a high concentration of protons outside the
cell. This gradient is then used to move solutes, such as sucrose, across the
plasma membrane into the cell where the sucrose concentration is already
relatively high. The type of transport used to move sucrose is an example of:
Secondary active transport
A mutation in ___ results in a change in ___ that sometimes produces a ___ with
altered structure and function.
DNA; RNA; Protein.
Which of the following accurately describes the path traveled by a new protein as
it is synthesized and released from the cell?
Ribosome >> ER >> Golgi >> Vesicle >> Plasma membrane >> External environment
Which one of the nucleotides could base pair with a pyrimidine?
Guanine
Which one of the nucleotides could base pair with a pyrimidine?
Guanine
Imagine you have discovered a new species of bacteria. To begin your
investigation of this organism, you run an assay on the total nucleotide content
of the bacterial DNA. If the cytosine content of DNA from the bacterial cells is
40%, what is the adenine content?
10%
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