Multiple Choice
Which of the following is a primary way that single-celled organisms maintain homeostasis?
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10. Cell Signaling
Introduction to Cell Signaling
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Which action describes a response to internal stimuli?
A
A plant bending toward a light source
B
A human sweating in response to high external temperature
C
A cell increasing glucose uptake in response to low internal ATP levels
D
A bacterium swimming toward a nutrient source
Verified step by step guidance1
Step 1: Understand the concept of internal stimuli. Internal stimuli refer to changes within an organism's internal environment that trigger a response to maintain homeostasis or proper functioning.
Step 2: Analyze each option provided in the problem. Determine whether the action described is a response to internal or external stimuli.
Step 3: Evaluate the first option, 'A plant bending toward a light source.' This describes a response to an external stimulus (light), not an internal stimulus.
Step 4: Evaluate the second option, 'A human sweating in response to high external temperature.' Sweating is a response to an external stimulus (temperature), not an internal stimulus.
Step 5: Evaluate the third option, 'A cell increasing glucose uptake in response to low internal ATP levels.' This describes a response to an internal stimulus (low ATP levels), as the cell adjusts its glucose uptake to restore energy balance.
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