Chloroplast are _______ membrane-bounded structures.
single
double
both
none

The inner membrane forms many infoldings, called _____.
cristae
path
reaction site
none

Mitochondria are _______ membrane-bounded structures.
single
double
both
none

Ribosomes are the sites of ___ synthesis.
energy
protein
lipids
chemicals

Microtubules are made of _____protein.
tubulin 
actin
both
none

The lipid bilayer gives _____ to membrane.
energy
rigid
elasticity 
none

Fungi and many protists have a cell wall composed of_____.
chitin
cellulose
peptidoglycan
none

Prokaryotes have a cell wall composed of_____.
chitin
cellulose
peptidoglycan 
none

The pores in cell walls of adjacent cells, through which their cytoplasm is connected. These pores are called ________.
primary wall
secondary walls
plasmodesmata
none