Apoptosis is necessary during animal development for

Answer: Sculpting structures (e.g., separating fingers from webbing) and removing damaged or surplus cells Programmed cell death sculpts the developing body — removes interdigital webbing, prunes neurons, eliminates infected/damaged cells.

The diagram shows childbirth signaling. The relationship between cervical stretch and oxytocin is best classified as:

Answer: Positive feedback Greater stretch increases oxytocin, which causes contractions and more stretch—a self-reinforcing positive feedback loop ending only at delivery.

This diagram represents which type of feedback?

Answer: Negative feedback that maintains homeostasis When the output inhibits the upstream stimulus, the system tends toward a setpoint—this is negative feedback, the basis of homeostasis.

AP Biology · Topic 4.5

Feedback Practice

Part of Cell Communication and Cell Cycle.(IST-3.E)

Practice questions

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Sample questions

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Sample 1difficulty 2/5
$Apoptosis is necessary during animal development for$
- A
  $Regenerating bone tissue after fracture or injury$
- B
  $Sculpting structures (e.g., separating fingers from webbing) and removing damaged or surplus cells$
  check_circle
- C
  $Maximizing tissue mass by preventing cell loss during organ formation$
- D
  $Producing haploid gametes for sexual reproduction$
Why
$Programmed cell death sculpts the developing body — removes interdigital webbing, prunes neurons, eliminates infected/damaged cells.$
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Sample 2difficulty 2/5
$The diagram shows childbirth signaling. The relationship between cervical stretch and oxytocin is best classified as:$
- A
  $Negative feedback$
- B
  $Positive feedback$
  check_circle
- C
  $Homeostasis$
- D
  $Apoptosis$
Why
$Greater stretch increases oxytocin, which causes contractions and more stretch—a self-reinforcing positive feedback loop ending only at delivery.$
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Sample 3difficulty 2/5
$The diagram models a regulatory loop in which a downstream output reduces the activity of the upstream stimulus.$
$This diagram represents which type of feedback?$
- A
  $Signal transduction without feedback$
- B
  $Negative feedback that maintains homeostasis$
  check_circle
- C
  $Positive feedback that amplifies the response$
- D
  $Apoptotic feedback$
Why
$When the output inhibits the upstream stimulus, the system tends toward a setpoint—this is negative feedback, the basis of homeostasis.$
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Sample 4difficulty 2/5
$Apoptosis is best described as$
- A
  $Programmed, regulated cell death essential for development and tissue homeostasis$
  check_circle
- B
  $Programmed, controlled cell division required for embryonic patterning and tissue growth$
- C
  $Reversible, transient cell shrinkage used by neurons to manage stress and resource scarcity$
- D
  $Unregulated, traumatic cell death triggered by external injury or infection in tissues$
Why
$Apoptosis is a tightly regulated suicide program — cell shrinks, DNA fragments, surface markers signal phagocytes to clean up.$
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Sample 5difficulty 3/5
$The graph shows blood glucose oscillating around a setpoint controlled by pancreatic hormones.$
$Which hormone is released to LOWER blood glucose after a meal?$
- A
  $Glucagon$
- B
  $Adrenaline$
- C
  $Insulin$
  check_circle
- D
  $Cortisol$
Why
$Beta cells of the pancreas release insulin in response to high blood glucose. Insulin promotes glucose uptake and storage as glycogen.$
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