Bio exam 2 Hw
Which of these hormones are responsible for the "fight or flight" response to danger?
epinephrine and norepinephrine
Which of these extracellular signal molecules could diffuse through a plasma membrane and bind to an intracellular receptor?
estrogen
Which of these glands secretes releasing hormones?
hypothalamus
An enzyme _____.
is an organic catalyst
A human cell placed into a hypertonic solution is likely to
lose water by osmosis.
How many NADH are produced by glycolysis?
2 NADH
In glycolysis, what starts the process of glucose oxidation?
ATP
In which organisms do cellular respiration and photosynthesis occur?
Cellular respiration occurs in both producers and consumers.
In glycolysis there is a net gain of _____ ATP.
It takes 2 ATP to produce 4 ATP.
A cell that neither gains nor loses water while sitting in a solution is probably sitting in
an isotonic environment.
What hormone promotes water retention by the kidneys?
antidiuretic hormone (ADH)
Receptors for nonsteroid hormones are located in _____.
association with a cell's plasma membrane
How do nonsteroid hormones differ from steroid hormones?
nonsteroid hormones act via signal transduction pathways; steroid hormones do not act via signal transduction pathways
Steroid hormone-receptor complexes act in _____.
nucleus
Which of the following molecules can cross the lipid bilayer of a membrane directly, without a transport protein or other mechanism?
oxygen, water,lipids,cardon dioxide
In general, enzymes are what kinds of molecules?
proteins
Enzymes work by _____.
reducing EA
When a person is dehydrated, his or her IV fluids
should be isotonic, because either a hypertonic or hypotonic IV would damage red blood cells.
A signal transduction pathway is initiated when a _____ binds to a receptor.
signal molecule
the cell-signaling components in the order in which they are engaged, starting with the signaling cell on the left and ending with transcription in the target cell on the right.
signal molecule, receptor protein,relay proteins,trasncription factor
What name is given to the reactants in an enzymatically catalyzed reaction?
substrate
In glycolysis, ATP molecules are produced by _____.
substrate-level phosphorylation
A human cell placed in a hypotonic environment would
take up water through osmosis.
Which of these is the second of the three stages of cell signaling?
transduction