Study sets, textbooks, questions
Upgrade to remove ads
CELL BIO Exam 2
Cell bio chapter 5, and 8
Terms in this set (13)
People who are lactose intolerant cannot extract energy from milk because ________.
they are missing an enzyme
A number of systems for pumping ions across membranes are powered by ATP. Such ATP-powered pumps are often called ATPases, although they do not often hydrolyze ATP unless they are simultaneously transporting ions. Because small increases in calcium ions in the cytosol can trigger a number of different intracellular reactions, cells keep the cytosolic calcium concentration quite low under normal conditions, using ATP-powered calcium pumps. For example, muscle cells transport calcium from the cytosol into the membranous system called the sarcoplasmic reticulum (SR). If a resting muscle cell's cytosol has a free calcium ion concentration of 10 -7 while the concentration in the SR is 10 -2, then how is the ATPase acting?
ATPase activity must be pumping calcium from the cytosol to the SR against the concentration gradient.
Starch and cellulose ________.
are polymers of glucose
Which of the following statements is true for lipids?
Lipids mix poorly with water.
Which of the following is the most correct interpretation of the figure?
ATP is a molecule that acts as an intermediary to store energy for cellular work.
How do phospholipids interact with water molecules?
The polar heads interact with water; the nonpolar tails do not.
In sickle-cell disease, as a result of a single amino acid change, the mutant hemoglobin tetramers associate with each other and assemble into large fibers. Based on this information alone, we can conclude that sickle-cell hemoglobin exhibits ________.
altered primary structure and altered quaternary structure; the secondary and tertiary structures may or may not be altered
A chemical reaction that has a positive Δ G is best described as ________.
Which of the following best summarizes the relationship between dehydration reactions and hydrolysis?
Dehydration reactions assemble polymers; hydrolysis reactions break polymers apart.
Which of the following statements about anabolic pathways is true?
They consume energy to build up polymers from monomers.
During a laboratory experiment, you discover that an enzyme-catalyzed reaction has a ∆ G of -20 kcal/mol. If you double the amount of enzyme in the reaction, what will be the ∆ G for the new reaction?
Chemical equilibrium is relatively rare in living cells because metabolic pathways are interconnected. Which of the following statements describes an example of a reaction that may be at chemical equilibrium in a cell?
a chemical reaction in which neither the reactants nor the products are being produced or consumed in any metabolic pathway at that time in the cell
Which of the following statements is true of metabolism in its entirety in all organisms?
Sets with similar terms
Biochemistry Test :(
Bio Study 10-17
Bio 112 Topic 2
Ficken Chapter 2 Test EP
Other sets by this creator
EXAM 4: Cell bio Chapters 11, 12, 13
PSY Exam 3 study material
PSY Exam 2 study material
PSY Exam 1 study material