Exam 1

A  less ACh releases

B  more ACh releases

C  none of the choices.

D  same amount of ACh releases

A  The Ca2+ will be removed from sarcoplasm

B  The tropomyosin will be moved to the side

C  The myosin will get disconnected from actin

D  power stroke occurs

A  SER

B  Centriole

C  Lysosome

D  Golgi

A  can not be determined

B  30%

C  20%

D  40%

A  latent

B  none of the choices

C  relaxation

D  contraction

A  more calcium is available in the sarcoplasm

B  additional neurons begin stimulating each muscle fiber

C  stronger stimuli inhibit motor unit activation

D  recruitment occurs and more motor units respond to stronger stimuli

A  Calcium ions directly activate ATPase in the myosin head.

B  The release of calcium ions triggers the immediate regeneration of creatine phosphate to power the contraction.

C  Calcium ions bind to lactic acid to remove it from the contracting muscle.

D  Calcium ions bind to the troponin-tropomyosin complex and remove their inhibitory action on actin/myosin interaction.

A  cause ATP binding to actin

B  release synaptic vesicles from the axon terminal

C  release the inhibition on Z discs

D  increase the conduction speed of action potentials transmitted along the sarcolemma

E  remove the blocking action of tropomyosin

A  Actin protein will not get stabilized

B  ATP pathway will be gone so muscle will not contract.

C  Myosin head will not be disconnected from actin

D  AP or electrical impulse will not reach the SR

A  FALSE

B  TRUE

A  anaerobic; anaerobic

B  anaerobic; aerobic

C  aerobic; aerobic

D  aerobic; anaerobic

A  Intermediate filaments

B  Microtubules

C  Microfilaments

D  Actin filaments

A  A mitotic spindle must form.

B  The nuclear envelope must break up.

C  The chromosomes must be duplicated.

D  The nucleus must divide in two.

E  The sister chromatids must be separated.

A  organelle

B  DNA

C  cytoplasm

D  cell wall

A  prophase

B  Metaphase

C  Telophase

D  Anaphase

A  centrioles

B  peroxisomes

C  lysosomes

D  rough endoplasmic reticulum

A  the polar heads are pointed toward the center of the membrane

B  the polar heads face the interior and exterior of the cell with the tails forming the center of the membrane

C  the nonpolar tails are oriented toward the interior of the cell, next to the cytoplasm

D  the polar heads and nonpolar tails alternate facing inward

A  The cell will run out of energy

B  Waste will accumulate in the cell and more chances of infection may occur

C  The cell will not make protein properly

D  The cell will collapse

A  Met-Pro

B  Met-stop

C  Met-Gly

D  none of the choices

E  Met-Arg

A  osmosis

B  diffusion

C  endocytosis

D  filtration

A  On the exterior surface of the cell

B  Inside the target cell’s cytoplasm or nucleus

C  Steroid hormones don’t interact with target cells

D  Through interaction with an integral membrane protein

A  hydrogen atoms

B  small size

C  ability to form hydrogen bonds

D  oxygen atom

A  the number of valence shell electrons

B  the total number of electrons

C  the number of protons in the nucleus

D  the number of neutrons in the nucleus

A  basic

B  none of the choices.

C  Acidic

D  neutral

A  individual amino acids

B  aggregations of polypeptides formin a complex protein with more than two subunits.ming a complex protein

C  hydrogen bonds between adjacent amino acids

D  alpha-helices

A  protein synthesis

B  being a genetic blueprint

C  forming the basis of the cell membrane bilayer

D  as cellular fuel

A  desmosomes

B  receptor

C  tight junction

D  gap junction

A  C

B  Ca

C  H

D  N

A  Temperature

B  All of the choices could affect the enzyme function

C  altering the active site

D  noncompetitive inhibitor

E  competitive inhibitor

A  none of the choices.

B  receptor

C  control center

D  effector

A  decrease

B  threefold increase

C  remain unchanged

D  twofold increase

A  When the output shuts off the original effect of the stimulus

B  The ability to maintain relatively stable external conditions even though the inside world changes continuously

C  The ability to maintain relatively stable internal conditions even though the outside world changes continuously

D  The response enhances the original stimulus so that the response is accelerated

A  by increasing the Calcium in the blood by activating calcitonin

B  none of the choices.

C  By providing Ca to the blood during bone resorption and activation of asteoclast cells

D  by stimulating the Thyroid gland to release Calcium

A  structure is related to the function

B  negative feedback

C  SER achieving homeostasis

D  Positive feedback

A  homeostasis

B  hierarchical organization

C  complementarity

D  negative feedback