One answer could doesnt matter
how do cells become specialized so they can have specific functions?
a. each type of cells has its own dna instructions for its function.
b. your cerebellum signals the cells telling them what type to turn into.
c. special 'command cells' tell them what type of cell to turn into.
d. they all have the same dna but activate different genes specific to their needs.
the molecule that is the usual source of energy for most organisms is:
a. caffeine
b. glucose
c. atp
d. nadph
in 1931 built the first transmisssion electron microscope, allowing structures of the cell to be seen for the first time.
a. robert hooke
b. anthony van leeuwenhoek
c. ernst ruska
d. louis pasteur
matthias schleiden and theodor schwann made which contribution to science?
a. discovered a basic principle of chemistry, that all matter is composed of atoms.
b. discovered that new organisms do not spontaneously arrive in suitable conditions, but must be brought there.
c. discovered the process plants use for energy, photosynthesis.
d. discovered a basic principle of biology, that all plants and animals are made of cells.
which of the following organelle pairs could only be in a plant?
a. ribosomes and nucleus
b. nucleus and mitochondria
c. nucleus and chloroplasts
d. cytoplasm and cell membrane
cells are:
a. the primary source of energy.
b. where prisoners live.
c. a group of related organs.
d. the basic unit of life.
you observe a sample under a microscope. it is 5 µm in diameter and has a nucleus. what would it most likely be?
a. a single strand of hair.
b. an ovum (egg cell).
c. a sperm cell.
d. a bacterial cell.
what is the function of the nucleus?
a. stores the cell's glucose
b. stores the cell's dna
c. produces energy for the cell by respiration
d. builds proteins
you observe an organelle in the process of making proteins. which organelle is it?
a. ribosome
b. mitochondria
c. cytoplasm
d. vacuole
what is the function of the mitochondria?
a. stores the cell's dna
b. builds proteins
c. stores the cell's glucose
d. produces energy for the cell by respiration