Ap bio
The interior of the phospholipid bilayer is
Hydrophobic
Celery stalks that are immersed in freshwater for several hours become stiff and hard. Similar stocks left in a salt solution become meant and salt. From this we can deduce that the cells of the celery stalks are
Hypertonic to fresh water but hypertonic to the salt solution
Contains hydrolytic enzymes
Hysosome
Results from a transfer of electrons between atoms
Ionic bond
A cell within internal concentration of 0.02 molar glucose is placed in a test tube containing 0.02 molar glucose solution. Assuming that glucose is not actively transported into the cell, which of the following terms describes the internal concentration of the cell related to its environment
Isotonic
A patient has found a serious accident and lost a lot of blood. In an attempt to replenish blood fluids, a large amount of distilled water was transferred directly until one of his veins. What will be the most probable results of this transfusion
It will have serious, perhaps fatal, consequences because the red blood cells will be hypertonic related to the body fluids and the cells will burst
Which of the following pairs is mismatched
Lysosomes - protein synthesis
What is the voltage across cell membranes called
Membrane potential
Which of the following is not a part of the endomembrane system
Mitochondria
One of the main energy transformers of cells
Mitochondrion
Based on your knowledge of the polarity of water, the solute define the fun molecule is most likely
Negatively charged
Olive the following molecules are part of the cell membrane except
Nucleic acid
Detoxifies alcohol in the liver
Peroxisome
The membrane activity most nearly opposite to exocytosis is
Phagocytosis
White blood cells engulf bacteria through what process
Phagocytosis
Which type of lipid is most important in biological membranes
Phospholipid
Results from an unequal sharing of electrons between atoms
Polar covalent bond
Large number of ribosomes are present in cells that specialize in producing which of the following molecules
Proteins
Which structure is the site of the synthesis of proteins that may be exported from the south
Rough ER
Of the following which is probably the most common route for membrane to flow in the endomembrane system
Rough ER- vesicles - Golgi - plasma membrane
The 20 different amino acids found in polypeptides exhibit different chemical and physical properties because of different
Side chains (R groups)
What type of organelle is primarily involved in the synthesis of oils, phospholipids, and steroids
Smooth endoplasmic reticulum
According to the induced fit hypothesis of enzyme function which of the following is correct
The binding of the substrate changes the shape of the enzymes slightly
So can be described as having a cytoskeleton of internal structures that contribute to the shape, organization, and movement of the cell. All of the following are part of cytoskeleton except
The cell wall
In the reaction A-> B + C + heat,
The potential energy of the products is less than that of the reactant
All of the following situations are consistent with active transport except
The rate of movement of molecules across the cell membrane increases in an anaerobic environment
Which of the following is true of both starch and cellulose
They are both polymers of glucose
An animal secretory cell and they photosynthetic we still are similar and all the following ways except
They both have chloroplasts
The tertiary structure of a protein is the
Three- dimensional shape
A membrane that encloses A versatile plant compartment. Many gold reserves of organic compounds or inorganic ions
Tonoplast
The co transport protein that allows two different substances that pass through a membrane in the same direction is
Usually associated with a proton pump
The nutritional information on the cereal box shows that one serving of dry cereal has 80 calories ( actually kilocalories). If one were to burn a serving of cereal, the amount of heat given off would be sufficient to raise the temperature of 1 kg of water how many degrees Celsius
80.0 degrees Celsius
What is a fat or traicylglycerol
A lipid of three fatty acids and glycerol
Which of the following descriptions best fit the class of molecules known as nucleotides
A nitrogen base, a phosphate group, and they five-carbon sugar
A cell has the following molecules and structures: enzymes, DNA, ribosomes, plasma membrane, and mitochondria. It could be a cell from
A plant or an animal
Which of the following would indicate that facilitated diffusion was taking place
A substance was diffusing much faster than the physical condition indicated it should
Substance X is
A substrate
Which of the following statement is true regarding enzymes cooperativity
A substrate molecule bound to an active site effects the active site of several subunits
What would be an acceptable consequence of changing one amino acid into a particular protein
A tertiary structure might be changed, the primary structure would be changed, the biological activity of this protein might be altered
Waters high specific heat is mainly a consequence of the
Absorption and release of heat when hydrogen bonds break and form
The movement of a substance across a biological membrane against its concentration gradient with the help of energy input is which of the following
Active transport
How can one increase the rate of a chemical reaction
Add a catalyst
The hydrogenation of vegetable oil would result in
All of the above
Substance a function
An allosteric inhibitor
The active site of an enzyme is the region that
Binds with the substrate
Anabolic pathways
Both depends on enzymes and consume energy to build up polymers from monomers
Which of the following would likely move through the lipid bilayer of a plasma membrane most rapidly
CO2
A cell lacking oligosaccharides on the external surface of its plasma membrane would likely be inefficient in
Cell. Cell recognition
Cells of being able to form Julio or flagella they do not have
Centrioles
If the pH of a solution is Victoria from 7 to 6, it means that the
Concentration of H positive has increased to 10x what it was at pH 7, and concentration OH negative has decreased 10 times what it was at pH 7
The sodium- potassium pump is called an electrogenic pump because it
Contributes to the membrane potential
Mutant cells lacking coated pits would most likely be
Deficient in receptor- mediated endocytosis
Which of the following best summarizes the relationship between dehydration reactions and hydrolysis
Dehydration reactions assemble polymers, and hydrolysis breaks them down
The presence of cholesterol in the plasma membranes of some animals
Enables the membrane just a fluid more easily when they sell temperature drops
Which of the following is not found in prokaryotic cell
Endoplasmic reticulum
Which of these statements regarding enzymes is false
Enzymes provide activation energy for the reactions they catalyze
All of the following statements are representative of the second law of thermodynamic except
Every time energy changes from, there is a decrease and entropy
Glucose diffuses slowly through artificial phospholipids bilayers. The cells lining the small intestine, however, rapidly move large quantities of glucose from the glucose - rich food into their glucose - for cytoplasm. Using this information, which transport mechanism is most probably functioning in the intestinal cells
Facilitated diffusion
The mechanism in which the end product of a metabolic pathway inhibits an earlier step in the pathways is known
Feedback inhibition
Plasmodesmata in plant cells are most similar in function to which the following structures in animal cells
Gap junction
Helps to recycle that sells organic material
Goji apparatus