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BIOL 260 EXAM 1 Questions And Correct Answers
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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 ...

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  • August 28, 2024
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  • 2024/2025
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  • biol 260 exam 1 questions and correct answers

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©THEBRIGHT EXAM STUDY SOLUTIONS 8/27/2024 12:01 PM



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


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

, ©THEBRIGHT EXAM STUDY SOLUTIONS 8/27/2024 12:01 PM


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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