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Eleventh Grade (Grade 11) Biology Questions

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Grade 11 Nervous and Endocrine Systems
This neuroglial cell connects blood vessels to neurons.
  1. microglial cell
  2. astrocyte
  3. Schwann cell
  4. oligodendrocyte
Grade 11 Adaptations and Behavior
Dogs can communicate using pheromones.
  1. True
  2. False
Grade 11 Skin, Skeleton, and Muscles
This muscle on the lateral side of the forearm extends the wrist and abducts the hand.
  1. extensor carpi radialis brevis
  2. trapezius
  3. latissimus dorsi
  4. extensor carpi radialis longus
Grade 11 Skin, Skeleton, and Muscles
The removal of calcium ions from the cytosol of skeletal muscle causes
  1. the myosin binding sites on actin to be uncovered by tropomyosin.
  2. tropomyosin to change conformation and thereby move troponin molecules over cross-bridge binding sites.
  3. troponin to change conformation and thereby expose cross-bridge binding sites.
  4. the myosin binding sites on actin to be covered by tropomyosin.
Grade 11 Skin, Skeleton, and Muscles
Which statement is true regarding skeletal muscle contraction?
  1. The cross-bridge cycle refers to the sequence of events between the time an individual cross bridge binds to a thin filament at the start of a muscle contraction and the time the cross bridge releases the filament at the end of the contraction.
  2. Excitation-contraction coupling refers to the binding of energized myosin to actin.
  3. Binding of myosin to actin cannot take place in the absence of calcium ions.
  4. A single twitch in skeletal muscle lasts about as long as the action potential that caused it.
  5. All the choices are true.
Grade 11 Skin, Skeleton, and Muscles
The binding of                     to myosin permits cross-bridge                     between actin and myosin.
  1. ATP; attachment
  2. ATP; detachment
  3. calcium; attachment
  4. calcium; detachment
  5. actin; detachment
Grade 11 Skin, Skeleton, and Muscles
What separates and surrounds fascicles?
  1. epimysium
  2. perimysium
  3. endomysium
  4. none of the above
Grade 11 Human Reproduction
The gland that secretes a fluid that helps neutralize acid in the urethra is the
  1. seminal vesicle.
  2. prostate gland.
  3. epididymis.
  4. Cowper's gland.
Grade 11 Zoology
Ships and boats in the ocean become more and more important for jellyfish to thrive. One reason for the phenomenon is that
  1. jellyfish settle and grow their sperm on them.
  2. they bring extra food to jellyfish.
  3. they stir up the water to regulate the temperature.
  4. they provide shade so that jellyfish do not get sun burned.
Grade 11 Anatomical Organization
A section that divides the body on the longitudinal plane into equal right and left parts is a(n)
  1. median (midsagittal).
  2. oblique.
  3. transverse.
  4. frontal.
  5. coronal.
Grade 11 Nervous and Endocrine Systems
What part of the brainstem is usually damaged in people living in a coma?
  1. medulla
  2. reticular formation
  3. midbrain
  4. diencephalon
Grade 11 Skin, Skeleton, and Muscles
Which muscle is located in the trunk area? Select all that apply.
  1. pectoralis major
  2. transverse abdominis
  3. gastrocnemius
  4. rectus abdominis
  5. rectus femoris
  6. hamstring
Grade 11 Zoology
Which group of crustaceans looks similar to the mollusks superficially?
  1. isopods
  2. decapods
  3. copepods
  4. barnacles
Grade 11 Skin, Skeleton, and Muscles
Bone marrow secretes endocrine hormones.
  1. True
  2. False
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