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AP Biology Unit 4A: Cell Communication & Signal Transduction — practice questions — page 2

Explore 50 free Unit 4A: Cell Communication & Signal Transduction questions in AP Biology Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 4A: Cell Communication & Signal Transduction questions and exercises with answers

Showing questions 31–50 of 50.

Complete the second messenger relayRead the answer and worked solution →The neurotransmitter released at the NEUROMUSCULAR JUNCTION is:Read the answer and worked solution →Check these heart and blood factsRead the answer and worked solution →The endocrine gland often described as the master gland of the body is the:Read the answer and worked solution →Endocrine glands are different from other glands because they:Read the answer and worked solution →Insulin is secreted by which endocrine gland?Read the answer and worked solution →The hormone thyroxine is produced by the:Read the answer and worked solution →Goitre — a noticeable swelling of the neck — results from a deficiency of:Read the answer and worked solution →Adrenaline, often called the emergency hormone, is released by the:Read the answer and worked solution →Which one of the following correctly pairs an endocrine gland with the hormone it secretes?Read the answer and worked solution →Diabetes mellitus is mainly caused by:Read the answer and worked solution →Parathormone, secreted by the parathyroid glands, mainly regulates the body's level of:Read the answer and worked solution →Glucagon, also a pancreatic hormone, does the opposite of insulin. It:Read the answer and worked solution →Dwarfism results from the under-secretion of which hormone during childhood?Read the answer and worked solution →Cortisone, a stress-management hormone, is secreted by the:Read the answer and worked solution →Hormones travel from an endocrine gland to their target organ through:Read the answer and worked solution →A salivary gland is best classified as a / an:Read the answer and worked solution →A child has been diagnosed with cretinism. The most likely cause is:Read the answer and worked solution →A student is suddenly chased by a stray dog. The hormone that quickly readies the body for the chase is:Read the answer and worked solution →Excess production of growth hormone before adulthood mainly causes:Read the answer and worked solution →

Worked practice questions

Complete the second messenger relay

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Missing parts
  1. Answer
    phosphate
    Choices
    1. phosphate
    2. methyl
    3. acetyl
  2. Answer
    phosphatase
    Choices
    1. kinase
    2. phosphatase
    3. polymerase
  3. Answer
    cyclic AMP
    Choices
    1. cyclic AMP
    2. glycogen
    3. tryptophan
Complete the statement
A kinase adds a {0} group to a protein, and a {1} takes it off again. Small molecules such as calcium and {2} then spread the signal through the cytoplasm.
Instructions
Tap a word for each blank to complete how a signal is passed on inside the cell.
_Source: OpenStax Biology 1e, section 9.2 Propagation of the Signal_

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The neurotransmitter released at the NEUROMUSCULAR JUNCTION is:

  1. Acetylcholine (Ach) at the motor end plate
  2. GABA (chief inhibitory neurotransmitter)
  3. Dopamine (involved in reward and motor)
  4. Serotonin (regulates mood and sleep)
Show answer and solution

Correct answer: A. Acetylcholine (Ach) at the motor end plate

ACETYLCHOLINE (Ach) is released at the neuromuscular junction by motor neurons binds nicotinic ACh receptors on muscle, triggering contraction. GABA + glycine = inhibitory (CNS). Dopamine = reward/motor; serotonin = mood.

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Check these heart and blood facts

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Questions
  1. Statement is true
    Yes
    Statement
    The heart has four chambers.
  2. Statement is true
    Yes
    Statement
    Arteries carry blood away from the heart.
  3. Statement is true
    No
    Statement
    Veins always carry oxygenated blood.
  4. Statement is true
    Yes
    Statement
    Capillaries are the smallest blood vessels.
Instructions
Read each line about the heart and its vessels, then tap true or false.

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