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16. The proteins that form the walls of the microtubules are

A. actin
B. tubulin
C. pectin
D. hydroxyproline

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17. The color of the flower is due to the presence of

A. chlorophyll
B. xanthophylls
C. florigen
D. chromoplast or anthocyanin

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18. What are the names of the two genders of haploid yeast cells?

A. A and Alpha
B. M and F
C. Y(a)and Y(b)
D. None of these

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19. Neurospora is used as an experimental tool in

A. ecology
B. cytology
C. genetics
D. physiology

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20. The volume of O₂ liberated in photosynthesis has which of the following ratio to Co₂?

A. 1:1
B. 2:1
C. 1:2
D. 3:1

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