Exam 1

A  none of the choices.

B  less ACh releases

C  more ACh releases

D  same amount of ACh releases

A  The myosin will get disconnected from actin

B  The Ca2+ will be removed from sarcoplasm

C  power stroke occurs

D  The tropomyosin will be moved to the side

A  SER

B  Centriole

C  Golgi

D  Lysosome

A  20%

B  40%

C  30%

D  can not be determined

A  none of the choices

B  relaxation

C  contraction

D  latent

A  more calcium is available in the sarcoplasm

B  additional neurons begin stimulating each muscle fiber

C  recruitment occurs and more motor units respond to stronger stimuli

D  stronger stimuli inhibit motor unit activation

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  increase the conduction speed of action potentials transmitted along the sarcolemma

B  cause ATP binding to actin

C  remove the blocking action of tropomyosin

D  release synaptic vesicles from the axon terminal

E  release the inhibition on Z discs

A  Myosin head will not be disconnected from actin

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

C  Actin protein will not get stabilized

D  AP or electrical impulse will not reach the SR

A  TRUE

B  FALSE

A  aerobic; anaerobic

B  aerobic; aerobic

C  anaerobic; anaerobic

D  anaerobic; aerobic

A  Microtubules

B  Microfilaments

C  Intermediate filaments

D  Actin filaments

A  The sister chromatids must be separated.

B  The chromosomes must be duplicated.

C  The nuclear envelope must break up.

D  The nucleus must divide in two.

E  A mitotic spindle must form.

A  cytoplasm

B  DNA

C  organelle

D  cell wall

A  Telophase

B  Metaphase

C  Anaphase

D  prophase

A  peroxisomes

B  centrioles

C  lysosomes

D  rough endoplasmic reticulum

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

B  the polar heads are pointed toward 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 collapse

B  The cell will run out of energy

C  The cell will not make protein properly

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

A  Met-Arg

B  Met-stop

C  Met-Pro

D  none of the choices

E  Met-Gly

A  filtration

B  diffusion

C  endocytosis

D  osmosis

A  Inside the target cell’s cytoplasm or nucleus

B  On the exterior surface of the cell

C  Steroid hormones don’t interact with target cells

D  Through interaction with an integral membrane protein

A  hydrogen atoms

B  oxygen atom

C  ability to form hydrogen bonds

D  small size

A  the number of neutrons in the nucleus

B  the number of valence shell electrons

C  the number of protons in the nucleus

D  the total number of electrons

A  Acidic

B  neutral

C  basic

D  none of the choices.

A  hydrogen bonds between adjacent amino acids

B  alpha-helices

C  individual amino acids

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

A  protein synthesis

B  as cellular fuel

C  forming the basis of the cell membrane bilayer

D  being a genetic blueprint

A  gap junction

B  tight junction

C  receptor

D  desmosomes

A  C

B  H

C  Ca

D  N

A  Temperature

B  noncompetitive inhibitor

C  competitive inhibitor

D  All of the choices could affect the enzyme function

E  altering the active site

A  receptor

B  none of the choices.

C  control center

D  effector

A  threefold increase

B  decrease

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 internal conditions even though the outside world changes continuously

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

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

A  by stimulating the Thyroid gland to release Calcium

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

C  none of the choices.

D  by increasing the Calcium in the blood by activating calcitonin

A  structure is related to the function

B  negative feedback

C  Positive feedback

D  SER achieving homeostasis

A  homeostasis

B  negative feedback

C  hierarchical organization

D  complementarity