Mitosis promoting factor is associated with cyclin b. Which class of enzymes are activated by cyclin b: Hydrolases Kinases Lipases Cytochalasin B disrupts: microtubules microfilaments intermediate fibers tubulin Which of the species has a egg that is not classified as isolecithal. amphioxus molluscs mammals amphibians nematodes A spore is a haploid gamete True False D Solution (C) Kinases are activated by cyclin b. (B) Cytochalasin B disrupts microfilament formation. (D) Eggs of amphibians are telolecithal.It is not classified as isolecithal (A) A spore is a haploid gamete..