Q1. The cell walls if bacteria, fungi and plant cells and an extracellular matrix of animal cells are all external to the plasma membrane. Which is the characteristic of all these extracellular structures?

Q2. In each dihybrid cross, the phenotype ratio of individuals with black hair and brown eyes, black hair and blue eyes, blonde hair and brown eyes, and blonde hair and blue eyes is.

Q3. a) What mitotic stages were visible within a square on the root tip?

b) Based on the data, what percent of the cell cycle is occupied by mitosis in the onion root tip? Is this finding expected given the information you learned about the cell cycle?