BLG 143 Lecture Notes - Lecture 12: Facilitated Diffusion, Phospholipid, Amphiphile
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Which can cross the phospholipid bilayer of a membrane without assistance from transport proteins?
A. | Ions such as Na+. | |
B. | Small hydrophobic molecules such as O2. | |
C. | Small hydrophilic molecules such as glucose. | |
D. | Any small molecule or ion. |
QUESTION 2
Which transport process requires a cell to expend energy?
A. | Moving a solute up its concentration gradient. | |
B. | No transport processes require energy. | |
C. | Moving a solute either up or down its concentration gradient. | |
D. | Moving a solute down its concentration gradient. |
QUESTION 3
Imagine a cell whose membrane is permeable to water, but impermeable to solute X. If solute X is more concentrated outside the cell than inside, which way will water move by osmosis?
A. | Water will not move in either direction, in or out of the cell. | |
B. | Water will move equally in both directions, in and out of the cell. | |
C. | Water will leave the cell. | |
D. | Water will enter the cell. |
QUESTION 4
The cellular structure that encloses the DNA/genes is the
ribosome. | ||
plasma membrane. | ||
nucleus. | ||
mitochondrion. |
QUESTION 5
The part of metabolism that builds larger, more complex molecules or structures from smaller, simpler components is | |
A. | anabolism. | |
B. | catabolism. | |
C. | catalysis. | |
D. | hydrolysis. |
QUESTION 6
In an exergonic reaction
A. | the reactants have more energy than the products, so energy is absorbed. | |
B. | the reactants have more energy than the products, so energy is released. | |
C. | the reactants have less energy than the products, so energy is released. | |
D. | the reactants have less energy than the products, so energy is absorbed. |
Question 401 pts
Kinetic energy is the stored energy that can be used for motion.
True |
False |
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Question 411 pts
When an electron is transferred from one atom to another, and the two atoms are then electrically attracted to one another, a(n) ________________ bond is formed.
ionic |
kinetic |
covalent |
hydrogen |
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Question 421 pts
Changing the number of ____________ of an atom would change the chemical properties of the atom.
neutrons |
protons |
electrons |
electron shells |
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Question 431 pts
Forming molecules and breaking down molecules in biological organisms usually requires the use of _________ to help the reaction proceed faster.
oil |
heat |
enzymes |
blood |
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Question 441 pts
Organic molecules have a core composed of .
carbon |
nitrogen |
phosphorus |
hydrogen |
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Question 451 pts
The building blocks of carbohydrates are
polypeptides |
amino acids |
nucleotides |
monosaccharides |
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Question 461 pts
Water molecules crossing a membrane from high to low concentration is .
active transport |
cell fate |
facilitated diffusion |
osmosis |
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Question 471 pts
Choose the membrane molecule responsible for the passage of polar molecules and ions into and out of the cell.
phospholipids |
transmembrane channel proteins |
cell surface proteins |
carbohydrate chains |
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Question 481 pts
The simplest cells are .
prokaryotic |
animal cells |
eukaryotic |
cells of fungi |
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Question 491 pts
Which of the following membrane bound organelles are found inside bacterial cells:
nucleus |
organelles are not found in prokaryotic cells |
mitochondria |
chloroplasts |
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Question 501 pts
Which of the following is a specialized components of the cell, is associated with the rough endoplasmic reticulum, and is responsible for making proteins.
vacuoles |
ribosomes |
golgi complex |
nucleus |
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Question 511 pts
Proteins are sorted, modified, and packaged by the _____________ and later transported to the outside of the cell.
ribosomes |
golgi bodies (golgi apparatus) |
nucleus |
mitochondria |
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Question 521 pts
Dehydration synthesis is a process of linking two smaller subunits together to form a polymer. Which of the following statements below is true of dehydration synthesis?
Oxygen is consumed. |
A water molecule is removed from the molecules. |
A water molecule is added to the molecules |
Carbon dioxide is given off. |
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Question 531 pts
Proteins are made up of _________ held together by peptide bonds.
monomers |
monosaccharides |
polymers |
amino acids |
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Question 541 pts
Which of the following gives an amino acid its properties?
NH2 |
R Group or functional group |
COOH |
H |
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Question 551 pts
The final three-dimensional shape of a protein that includes the bonding of two or more polypeptide chains is call its _____ structure.
Tertiary |
Quaternary |
Secondary |
Primary |
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Question 561 pts
How do DNA and RNA differ?
all statements are differences between DNA and RNA. |
DNA is double stranded while RNA is single stranded. |
They have different sugars. |
Thymine is present in DNA but not in RNA. |
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Question 571 pts
Which of the following is a component of a DNA nucleotide?
phosphate |
a nitrogen containing base |
All are components of a nucleotide. |
5-carbon sugar |
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Question 581 pts
Cell membranes are made up of several different types of molecules. Select the membrane molecule below that is made up of a polar region and two non-polar fatty acid tails.
transmembrane proteins |
carbohydrate chains |
phospholipids |
cell surface proteins |
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Question 591 pts
Two organelles which are believed to have once been free-living bacterial cells are ____________ and ______________.
chloroplasts and mitochondria |
golgi apparatus and endoplasmic reticulum |
ribosomes and nucleolus |
peroxisomes and lysosomes |
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Question 601 pts
The is an extensive system of internal membranes responsible for producing carbohydrates and lipids.
smooth endoplasmic reticulum |
rough endoplasmic reticulum |
nucleolus |
mitochondria |