Question at position 20 If a strand of hair contains a lot of pheomelanin granules, then that hair most likley appears to bewhitegrayblackredbrownClear my selectionSingle choice
A
white
B
gray
C
black
D
red
E
brown

Question

Question at position 20 If a strand of hair contains a lot of pheomelanin granules, then that hair most likley appears to bewhitegrayblackredbrownClear my selection

BlackTom AI · Accepted Answer

Pheomelanin yields reddish-yellow pigments, so hair rich in pheomelanin appears red.

1) Relevant knowledge points and concepts
- Two main hair pigments: eumelanin (black/brown) and pheomelanin (red/yellow).
- Hair color results from the type and relative amount of these melanins stored in melanosomes.
- Absence or very low pigment leads to white or gray hair due to air in the shaft or loss of melanin.

2) Complete reasoning process step by step
- Identify the pigment named: pheomelanin.
- Recall the color contribution of pheomelanin: it produces red to yellow tones.
- Assess the phrase “contains a lot of pheomelanin granules”: a predominance of pheomelanin will dominate the visible color.
- Therefore, if pheomelanin is abundant relative to eumelanin, the hair will show reddish hues.

3) Intermediate steps / illustrative comparison
- Case A: High eumelanin, low pheomelanin → black or brown hair (eumelanin is dark).
- Case B: High pheomelanin, low eumelanin → red hair (pheomelanin produces red tones).
- Case C: Very low total melanin → gray or white hair (loss of pigment).

4) Why the correct answer is correct
- Pheomelanin’s intrinsic pigment is red/yellow; its abundance gives hair a red appearance. Historical and biochemical studies of hair pigmentation link pheomelanin concentration directly to red hair.

5) Why other options are incorrect
- White: results from absence of pigment, not abundance of pheomelanin.
- Gray: typically from reduced melanin production or mixed pigmented and unpigmented hairs, not lots of pheomelanin.
- Black: produced by high eumelanin, not pheomelanin.
- Brown: produced primarily by eumelanin (or a mix with less pheomelanin); “a lot” of pheomelanin would shift color toward red rather than brown.

6) Conclusion
Because pheomelanin produces red/yellow pigments and an abundance of it gives hair reddish coloration, the correct answer is red — matching the provided answer.

Question at position 20 If a strand of hair contains a lot of pheomelanin granules, then that hair most likley appears to bewhitegrayblackredbrownClear my selectionSingle choice

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