Complete each of the following sentences. Saclike membranes that contain chlorophyll are known as
is a stack of thylakoids.
is the fluid portion of the chloroplast outside of the thylakoids.
Two
surround and enclose the chloroplasts.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

what are the awnser choices? i mean, without choices, it is an incompleat

a) carbon, hydrogen

b) carbon, hydrogen, oxygen, nitrogen

c) carbon, hydrogen, oxygen, nitrogen, phosphorus

d) sugar

e) amino acid

f) nucleotide