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

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 1–30 of 50.

NEET · Biology · Brain Regions ↔ FunctionRead the answer and worked solution →NEET · Biology · Sympathetic or ParasympatheticRead the answer and worked solution →NEET · Biology · Sympathetic ↔ Parasympathetic — Quick PairsRead the answer and worked solution →Among the five major plant hormones, which group acts as growth inhibitors rather than growth promoters?Read the answer and worked solution →Which plant hormone was the first to be discovered and is produced at the tip of stems and roots?Read the answer and worked solution →The suppression of growth of lateral buds by auxins produced in the apical bud is known as which phenomenon?Read the answer and worked solution →Which of the following is a synthetic auxin rather than one naturally produced by plants?Read the answer and worked solution →The cytokinin isolated from Zea mays that promotes cell division in plant cells is named:Read the answer and worked solution →The delay of ageing in plants caused by the application of cytokinin is given which specific name?Read the answer and worked solution →The internodal elongation seen in rice plants suffering from Bakanae or foolish seedling disease is caused by a substance later identified as:Read the answer and worked solution →Treatment of a rosette plant with gibberellin causes sudden shoot elongation followed by flowering. This response is called:Read the answer and worked solution →Which plant hormone is called the stress hormone because it increases plant tolerance to stress and causes stomatal closure during drought?Read the answer and worked solution →In the activity where unripe tomatoes are bagged with a ripe banana, the tomatoes ripen because the banana releases:Read the answer and worked solution →Which gland is anatomically composed of an anterior adenohypophysis and a posterior neurohypophysis?Read the answer and worked solution →The pituitary gland is called the master gland chiefly because it:Read the answer and worked solution →Oversecretion of growth hormone during childhood, leading to abnormal overgrowth and increased height, results in:Read the answer and worked solution →A deficiency of antidiuretic hormone (ADH) reduces water reabsorption in the kidney tubules, producing which disorder?Read the answer and worked solution →Both triiodothyronine (T3) and thyroxine (T4) are secreted by which gland, whose two lobes are joined by an isthmus?Read the answer and worked solution →An enlargement of the thyroid gland appearing as a swelling in the neck due to inadequate iodine in the diet is called:Read the answer and worked solution →Removal of the parathyroid glands during a thyroidectomy lowers parathormone and produces sustained muscle contractions known as:Read the answer and worked solution →Epinephrine and norepinephrine, released during stress and emotion, are called emergency hormones and are secreted by the:Read the answer and worked solution →The hormone thymosin, which stimulates the production and differentiation of lymphocytes, is secreted by the:Read the answer and worked solution →In the female, the luteinizing hormone (LH) from the anterior pituitary mainly brings about:Read the answer and worked solution →Communication that happens between two separate cells, rather than inside a single cell, is described by which term in cell signaling?Read the answer and worked solution →A signaling cell releases a small molecule that binds a specific protein on a target cell and delivers a signal. What is this released molecule called?Read the answer and worked solution →Steroid hormones such as estradiol and testosterone are built on a shared hydrocarbon skeleton. How is that skeleton described?Read the answer and worked solution →In a signaling cascade, events are described relative to a certain point in the pathway. What are the events that occur after that point called?Read the answer and worked solution →Budding yeasts use a secreted signaling molecule to find another haploid yeast cell ready to mate. What is this molecule called?Read the answer and worked solution →Match each signal to how far it goesRead the answer and worked solution →Inside the cell or on the surface?Read the answer and worked solution →

Worked practice questions

NEET · Biology · Brain Regions ↔ Function

Read exercise and reference answers
Matching pairs
  1. A
    Cerebrum
    B
    Voluntary action, thought
  2. A
    Cerebellum
    B
    Balance and coordination
  3. A
    Hypothalamus
    B
    Body temperature, hunger, thirst
  4. A
    Medulla
    B
    Heart rate, breathing
  5. A
    Pituitary
    B
    Master endocrine gland
  6. A
    Hippocampus
    B
    Memory formation
Instructions
Flip cards to match each brain region to its function.

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NEET · Biology · Sympathetic or Parasympathetic

Read exercise and reference answers
Items
  1. Item
    Raises heart rate
    Answer
    left
  2. Item
    Lowers heart rate
    Answer
    right
  3. Item
    Dilates pupils
    Answer
    left
  4. Item
    Constricts pupils
    Answer
    right
  5. Item
    Stimulates digestion (secretion)
    Answer
    right
  6. Item
    Releases adrenaline from adrenal medulla
    Answer
    left
Categories
Left
Sympathetic (fight-or-flight)
Right
Parasympathetic (rest-and-digest)
Instructions
Sort each autonomic-nervous-system action.

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NEET · Biology · Sympathetic ↔ Parasympathetic — Quick Pairs

Read exercise and reference answers
Matching pairs
  1. A
    Pupil dilation
    B
    Sympathetic
  2. A
    Increased heart rate
    B
    Sympathetic
  3. A
    Adrenaline release
    B
    Sympathetic
  4. A
    Pupil constriction
    B
    Parasympathetic
  5. A
    Lowered heart rate
    B
    Parasympathetic
  6. A
    Stimulated digestion
    B
    Parasympathetic
Instructions
Flip cards to match each effect to its branch of the ANS.

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