What is the primary structure of DNA in most living organisms?
How Space Might Have Shaped Our DNA

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Science, Biology, Chemistry, Physics
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11th Grade - University
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Hard
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Right-handed helix
Left-handed helix
Flat structure
Circular structure
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is the right-handed DNA helix significant for cellular function?
It allows cells to use left-handed nucleotides.
It is the most common structure in non-living matter.
It is the only structure that cells can decode.
It prevents DNA from forming left-handed helices.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does the term 'chiral' refer to in the context of nucleotides?
The ability to form both left and right-handed helices
The property of being mirror images that cannot be superimposed
The tendency to form flat molecular structures
The ability to change handedness under specific conditions
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What hypothesis explains the abundance of left-handed nucleotides in early Earth history?
They were less likely to be destroyed by cosmic rays.
They were the only form that could form right-handed helices.
They were more stable in Earth's atmosphere.
They were more abundant due to cosmic influences.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How might cosmic rays have influenced the chirality of DNA nucleotides?
By increasing the abundance of right-handed nucleotides
By directly forming right-handed helices
By causing left-handed electrons to destroy right-handed nucleotides
By preventing the formation of any chiral molecules
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