PSIO exam review

Which of the following accurately describes the key differences between catabolism and anabolism?

• Catabolism is the specialization of cells for a specific function; anabolism is the increase in the number of cells, size of cells of the material found between cells

• Catabolism is the construction of larger molecules from smaller ones; anabolism is the breakdown of larger molecules into smaller ones

• Catabolism is the breakdown of lager molecules into smaller ones; anabolism is the construction of larger molecules from smaller ones

• Catabolism is increase in the number of cells, size of cells or the material found between cells; anabolism is the specialization of cells for a specific function

All of the following about negative feedback loops are true EXCEPT

• Most feedback loops in the body are negative

• Used for conditions that need constant adjustment

• Response opposes the initial stimulus

• Response reinforces the initial stimulus

Which of the following correctly explains homeostasis?

• The condition in which the body's internal environment remains relatively constant

• The condition in which the body's external environment remains relatively constant

• 
  The condition in which the body is at equilibrium

• A relatively inexpensive way for the body to remain in physiological limits

Which TWO choices below explain what the function of an enzyme is

• Catalyze reactions

• Increase activation energy

• Lower activation energy

• Create Na+ for the sodium potassium pump

All of the following about the plasma membrane is true EXCEPT...

• The plasma membrane provides structural support

• The plasma membrane is a source of communication

• The plasma membrane is a physical barrier

• The plasma membrane is extremely permeable

Which of the following correctly describes the key differences between integral and peripheral proteins?

• Peripheral proteins extend completely across the membrane; integral proteins are attached to either the inner or outer surface of the cell membrane

• Peripheral proteins regulate what a cell lets in; integral proteins is the site where molecules bind to be let into the cell

• Peripheral proteins is the site where molecules bind to be let into the cell; Integral proteins regulate what a cell lets in

• Peripheral proteins are attached to either the inner or outer surface of the cell membrane; integral proteins extend completely across the membrane

Active transport and passive transport both allow substances to be brought across the membrane but the key difference between the two is?

• In active transport a substance is moving with its gradient and requires no energy while in passive transport the substance is moving against its gradient and requires energy

• In active transport a substance is moving against its gradient and requires energy while passive transport moves with its gradient and requires no energy

• Active transport is only applicable when focusing on large molecules while passive transport is only applicable when focusing on smaller molecules

• None of the Above are true

A red blood cell is placed into a solution and shortly after begins to swell this best represents...

• an isotonic solution

• a hypertonic solution

• a hypotonic solution

• none of the above

Which of the following would require a conformational (shape) change?

• A channel protein

• An aquaporin

• Carrier proteins

• peripheral protein

Which of the following correctly characterizes the sodium potassium pump

• Uses secondary active transport and energy often comes indirectly from ATP hydrolysis

• Uses secondary active transport and energy comes directly from ATP hydrolysis

• Uses primary active transport and energy comes indirectly from ATP hydrolysis

• Uses primary active transport and energy comes directly from ATP hydrolysis