Why do cells have a plasma membrane?

A. to separate protein from the nucleus

B. to distinguish plants from animals

C. to define the size of the cell

D. to separate the inside of the cell from its enviroment

What does the atomic number of each atom represent?

A carbon atom and a hydrogen atom form what type of bond in a molecule?

Grains of sugar dissolve more quickly in tea than do sugar cubes. Which answer correctly describes why this occurs? The sugar grains form a saturated solution. The sugar cube is already at equilibrium. The sugar grains have a greater surface area.

How many different Kinds of amino acids are there that you need to be sure to get into your body by eating a variety types of proteins

Use the reaction: 2AgNO3 (aq) + H2SO4 (aq) → Ag2SO4 (s) + 2H2O (l) What volume of 0.123 M AgNO3 (aq) is needed to form 0.657 g of Ag2SO4 (s) ? (A) 53.4 mL (B) 10.7 mL (C) 17.1 mL (D) 34.2 L (E) 34.2 mL

Read the scientific question below. "Does sunlight make plants live?" What is a likely hypothesis for the question?

A chemist is using a solution of HNO3 that has a pH of 3.75. What is [H+] for the solution?

What is the oxidation number for CO2

Which is a property of acids in aqueous solutions?

On the periodic table, calcium and bromine are located in period 4. What is one difference between the two elements? A. Calcium atoms are more reactive than bromine atoms. B.