PLEASE HELP The stamens are the female reproductive organs of a flower.
a. true
b. false
17
Phototropism is a process by which green plants make their own food.
a. true
b. false
18
A plant that grows year after year without replanting is called a(n)
annual.
a. true
b. false
19
A simple leaf has a blade that is in one piece.
a. true
b. false
20
The early growth stage of an embryo plant is called pollination.
a. true
b. false

In what for do plants utilize nitrogen? why do they need nitrogen?

Amines amides and amino acids are categories of

Lactase is essential for digesting lactose in milk. this enzyme is specific for this sugar. why? molecules and active sites vary in size; only properly sized molecules can fit.there is a precise compatibility between the active site and the lactose molecule.specificity refers to the action of the enzyme, such as hydrolysis, and relatively few molecules can be hydrolyzed.reaction-specific enzymes assume a fit by folding around the most numerous substrate molecules.