Question at position 44 A hormone is an example of which type of cell cycle signal?endogenousexogenous单项选择题
A
endogenous
B
exogenous

Question

Question at position 44 A hormone is an example of which type of cell cycle signal?endogenousexogenous

BlackTom AI · Accepted Answer

The question asks you to classify a hormone as a type of cell cycle signal, choosing between endogenous and exogenous.
Option 1: endogenous. Hormones are produced within the organism and act as internal signaling molecules that regulate cell cycles from within the body, fitting the definition of endogenous signals. This aligns with how cells respond to internal chemical cues during growth and division.
Option 2: exogenous. Exogenous signals come from outside the organism or from external sources, such as drugs, environmental factors, or signals from another organism. A hormone produced by the organism itself is not an external cue, so this option mislabels the source of the signal.
In distinguishing endogenous versus exogenous signals, consider the origin of the signal: internal production versus external introduction. Since a hormone is synthesized internally by endocrine tissues and travels to target cells to influence their cycle, the internal origin is the key criterion here.
Therefore, understanding hormones as internal regulators of the cell cycle supports identifying endogenous signals, while exogenous would be reserved for externally derived signals that affect cells.

Question at position 44 A hormone is an example of which type of cell cycle signal?endogenousexogenous单项选择题

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