BIOL 260 EXAM 1 Questions And Correct
Answers
The kidney helps to keep the acidity of body fluids contact by varying the amount of hydrogen
ions (H+) it secretes into the urine. you can confidently predict that this aspect of kidney function
will be controlled by
a negative feedback mechanism
...
The kidney helps to keep the acidity of body fluids contact by varying the amount of hydrogen
ions (H+) it secretes into the urine. you can confidently predict that this aspect of kidney function
will be controlled by
a negative feedback mechanism
feedforward regulation differs from feed-back regulation in the following way(s)
the former allows the CNS to anticipate the need for changes in physiological setpoints, whereas
the latter does not.
positive feedback differes from negative feedback because
positive feedback tends to enhance the triggering stimulus while negative feedback tends to
return the body to a homeostatic balance or "ideal" level
when a baby suckles at its mother's breast the stimulus at the breast is sent to the mother's brain
(a region called the hypothalamus). the brain responds by releasing hormones to stimulate the
production and the ejection of milk from the breast. this helps the newborn to receive
nourishment and encourages more suckling. this example is best described as a
positive feedback
some of the nerve endings in the skin are sensitive to changes in temperature. they are part of a
negative feedback mechanism regulating body temperature. these nerve endings represent a(n)
__________ in the negative feedback mechanism
receptor or sensor
what structural level is represented by the sequence of amino acids in a polypeptide chain?
primary structure
the hydrogen atoms of a water molecule are bonded to the oxygen atom by __________ bonds,
whereas neighboring water molecules are held together by _________ bonds.
polar covalent; hydrogen
needed to make one liter of a 0.27 Osmolar solution? MW of NCl = 58.5g / mole.
7.9 grams
the chemical symbol O=O means _________
the atoms are double bonded
choose the answer that best describes HCO3-
a bicarbonate ion
An acid with a pH of 6 has ________ hydrogen ions than pure water.
10-fold more
which of the following does NOT describe uses for the ATP molecule?
opening of gated ion channels
which of the following statement is correct regarding net diffusion?
the greater the concentration gradient, the faster the rate
which of the following would NOT be a constituent of a plasma membrane?
messenger RNA
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