Biology T3

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1.
1 point
According to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids?
2.
1 point
During aerobic cellular respiration, a proton gradient in mitochondria will be generated by ________ and used primarily for ________ .
3.
1 point
Consider this pathway: epinephrine → G-protein-linked receptor → G protein → adenylyl cyclase → cAMP. Identify the "second messenger."
4.
1 point
In what way do the membranes of a eukaryotic cell vary?
5.
1 point
All of the following are functions of the Krebs cycle except
6.
1 point
A concentration gradient is a form of
7.
1 point
The oxygen consumed during cellular respiration is directly involved in
8.
1 point
Which of the following types of molecules are the major structural components of the cell membrane?
9.
1 point
Which of the following is true of transcription factors?
10.
1 point
What kinds of molecules pass through a cell membrane most easily?
11.
1 point
Which of the following would likely move through the lipid bilayer of a plasma membrane most rapidly?
12.
1 point
Which of the following is one of the ways that the membranes of winter wheat are able to remain fluid when it is extremely cold?
13.
1 point
Pyruvate is formed
14.
1 point
Which of the following membrane activities requires energy from ATP hydrolysis?
15.
1 point
Mammalian blood contains the equivalent of 0.15 M NaCl. Seawater contains the equivalent of 0.45 M NaCl. What will happen if red blood cells are transferred to seawater?
16.
1 point
Where is ATP synthase located in the mitochondrion?
17.
1 point
Glucose diffuses slowly through artificial phospholipid bilayers. The cells lining the small intestine, however, rapidly move large quantities of glucose from the glucose-rich food into their glucose-poor cytoplasm. Using this information, which transport mechanism is most probably functioning in the intestinal cells?
18.
1 point
Ions diffuse across membranes down their
19.
1 point
Which process in eukaryotic cells will normally proceed whether O2 is present or absent?
20.
1 point
How many moles of ATP are produced from the complete oxidation of a mole of glucose in cellular respiration?
21.
1 point
Which of the following statements correctly describes the normal tonicity conditions for typical animal cells?
22.
1 point
You are working on a team that is designing a new drug. In order for this drug to work, it must enter the cytoplasm of specific target cells. Which of the following would be a factor that determines whether the molecule selectively enters the target cells?
23.
1 point
The cotransport protein that allows two different substances to pass through a membrane in the same direction is
24.
1 point
What is the voltage across a membrane called?
25.
1 point
What is the primary function of the light reactions of photosynthesis?
26.
1 point
At puberty, an adolescent female body changes in both structure and function of several organ systems, primarily under the influence of changing concentrations of estrogens and other steroid hormones. How can one hormone, such as estrogen, mediate so many effects?
27.
1 point
A protein that spans the phospholipid bilayer one or more times is
28.
1 point
In green plants, the primary function of the Calvin cycle is to
29.
1 point
A redox reaction involves the transfer of a(n)
30.
1 point
Which of the following statements best represents the relationships between the light reactions and the Calvin cycle?
31.
1 point
Growth factors are local regulators that
32.
1 point
A distinctive feature of the mechanism of action of thyroid hormones and steroid hormones is that
33.
1 point
All of the following statements about glycolysis are true except
34.
1 point
Phosphorylation cascades involving a series of protein kinases are useful for cellular signal transduction because
35.
1 point
The difference between pinocytosis and receptor-mediated endocytosis is that
36.
1 point
Inside an active mitochondrion, most electrons follow which pathway?
37.
1 point
Where does the Calvin cycle of photosynthesis take place?
38.
1 point
Phosphorylation cascades involving a series of protein kinases are useful for cellular signal transduction because
39.
1 point
Which of the following is characterized by a cell releasing a signal molecule into the environment, followed by a number of cells in the immediate vicinity responding?
40.
1 point
Which of the following is a correct association?
41.
1 point
The correct sequence of events in the cell-signaling process is