Quiz 1 Flashcards
(20 cards)
In active transport, the affinity of the carrier protein for the molecule being transported is greater on which side of the membrane?
On the side where the molecule is in lower concentration
A carrier protein is a transmembrane protein that moves molecules across the membrane through:
conformational changes in the carrier protein
conformational changes in the carrier protein
gap junctions
One way that membrane surface area is increased in absorptive cells is through increasing the ___________ of the membrane facing the lumen.
folding
Which of the following pairs of characteristics is more likely to make a substance diffuse through the phospholipid bilayer?
molecule being small and nonpolar
Clinically, one can monitor homeostasis of various substances such as ions, blood gases, and organic solutes by taking a blood sample and analyzing its plasma. Does knowing a patient’s plasma concentration of Na+ tell you its concentration in the ECF and ICF?
You would know the concentration of Na+ in the ECF but not the ICF
The first step of the Na+/K+ pump’s activity involves the binding of:
3 Na+ from the inside of the cell
Oxygen diffuses from blood into cells down its concentration gradient. As cells become more active and oxidative phosphorylation increases in the cell, which of the following occurs?
The concentration gradient for oxygen increases and oxygen movement into the cell increases.
Peripheral thermoreceptors monitor:
skin temperature
What feedback continually enhances the output, so that the regulated variable continues to be moved in the direction of the initial change?
positive
Which of the following is found in greater concentration inside the cell than outside?
potassium
Heat stroke is characterized by excessive sweating.
False
The net energy yield for the anaerobic metabolism of one glucose to lactate molecules is:
2 molecules of ATP and 0 NADH
2 molecules of ATP and 2 NADH
Cl-
When you first get an infection, you get the “chills” because:
the body is trying to increase temperature
Which of the following has the greatest amount of energy?
glucose
In completing the phases of glucose catabolism, leading ultimately to ATP, the carbons which start the reaction as part of the glucose molecule ultimately end up:
as carbon dioxide
Which of the following descriptions INCORRECTLY describes the tissue type?
Connective tissue is specialized for exchange between the internal and external environments.
The use of hormones, such as insulin and glucagon, to regulate glucose metabolism in the liver is an example of:
an extrinsic control system
Where does the conversion of pyruvate to acetyl CoA occur in a cell?
in the mitochondrial matrix
