16. The proteins that form the walls of the microtubules are
A. actin
B. tubulin
C. pectin
D. hydroxyproline
17. The color of the flower is due to the presence of
A. chlorophyll
B. xanthophylls
C. florigen
D. chromoplast or anthocyanin
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
19. Neurospora is used as an experimental tool in
A. ecology
B. cytology
C. genetics
D. physiology
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