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Bio 264 Final Review Exam|98 Questions and Answers
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Bio 264 Final Review Exam|98 Questionsand Answers
Captain Jack Sparrow is in a sword fight with an evil skeleton pirate. If Jack
were to cut off the skeleton's head, his sword would be following which body
plane: - -transverse
-Which of these statements about positive feedback is the MOST correct? - -
Birth is an example of a normally occurring positive feedback mechanism.
-Which of the following is NOT an example of a negative feedback loop? - -
During pregnancy, uterine stretching stimulates uterine muscle contraction.
-Which of these statements concerning positive feedback is correct? - -Birth
is an example of a normally occurring positive-feedback mechanism.
-Which of the following BEST explains why a person with a fever is shivering
but is hot to the touch? - -The set point for the homeostatic temperature has
been increased and their body is trying to match the new set point.
-Johnny eats three glazed doughnuts for breakfast, which caused his blood
glucose levels to increase. In response to this, his pancreas secretes insulin,
which results in the transfer of glucose from the blood into the cells. This
process decreases Johnny's blood glucose and he starts to feel hungry again.
Johnny is studying for a test and doesn't have time to go home for lunch. As
his blood glucose levels continue to drop his pancreas then secretes
glucagon. Johnny's liver then responds by releasing glucose into the blood.
Which one of the following statements about this scenario is MOST correct? -
-1. Blood sugar level is the set point in this scenario.
2. The release of insulin helps with negative feedback in this scenario.
3. The release of glucagon helps with negative feedback in this scenario.
-A researcher was studying the control of the level of Hormone W in rats. If
the level of hormone W in the blood is controlled by a negative feedback
loop, then injecting a rat with a small amount of Hormone W would have the
following effect: - -
-The atomic number of an atom is _________. - -the number of protons in the
atom.
-The nucleus of an atom is composed of ________. - -protons and neutrons.
-Which of these elements would be very stable? - -An element with 8
electrons in its third orbital
, -Which of these particles is the smallest in size? - -Electron
-How is atomic weight calculated? - -The number of protons plus the
number of neutrons contained in the nucleus.
-How many electrons in the outer most shell are there for Boron? - -3
electrons
-__________ bonds are formed when atoms share electrons equally. - -
Nonpolar covalent
-Which statement is NOT true about ionic bonds? - -An ion has the same
number of electrons as a non-ionic atom of the same element
-Within our body chemistry which of the following chemical bonds is the
strongest? - -Covalent bond
-Molecules that form when electrons are shared unequally between atoms
are called ________. - -polar molecules.
-A cation is a (an) - -positively charged atom.
-Why do Na and Cl make a bond? - -Na wants to give up an electron and Cl
wants to accept an electron- making both atoms more stable.
-Which statement is false - -Hydrogen can form 2 bonds in order to
complete a complement of 8 electrons in its outer most shell
-Which of the following can be found in hydrophilic compounds? - -ionic
bonds and polar covalent bonds
-In water hydrogen bonding occurs between the hydrogen atom in one
molecule and __________. - -an oxygen atom in a different molecule
-To make a 1% solution of glucose you would dissolve ____ gram(s) of
glucose into enough water to make a 100mL solution. - -1
-Osmolarity differs from molarity - -osmolarity reflects the number of
particles in solution
-How does water help to maintain the body's temperature even when the
weather is cold? - -As water molecules slow down they form more hydrogen
bonds and release energy and Since water has a high heat capacity it retains
heat longer.
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