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

AnswThe molecule that is the usual source of energy for most organisms is:

A. Caffeine

B. Glucose

C. ATP

D. NADPHer:

The Correct answer is Glucose

Explanation:

question#1

ans:

cell is the basic unit of organization of all living things. cells are often called the building block of life and it is the smallest unit of life. the study of cell is called cell biology. cell consists of cytoplasm enclosed within membrane, which contain bio-molecules such as proteins and nucleic acid.

two third of cell is water, which means that two-third of your whole body is water. the rest is the mixture of molecules, mainly proteins, lipids and carbohydrates.

question#2

ans:

organ:

an organ is a group of tissues specialized to form a functional unit. an example is the heart in animals.

organ system:

an organ system is a group of several organs whose functions are synchronized to release an effective action in a living organism. an example is digestive system.

question#3

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#4

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system—working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#5

our body works because of the interactions that happen between organs and organ systems.  

for example:  

the heart to regulate blood flow throughout the body. the blood carries oxygen and nutrients to the cells and carries carbon dioxide and waste away from the cells. body systems work together in maintaining a constant internal environment. when this balance is disrupted, the body systems may not function properly, and human health can suffer.   you start to feel bad.