Does a cell expend energy when molecules diffuse in or out of a cell?

What process occurs when a single flower self-pollinates by a male cell and female cell coming together to form a seed?

2. Why is variety in offspring so important?

Once you have been exposed to an antigen, you develop immunity against the same antigen because

What is the main function of the Krebs Cycle? A To supply energy for cell functions B To make carbon dioxide molecules C To fuel the glycolysis process D To produce energy-carrier molecules

Adaptations areA. unfavorable traits in a particular environment. b. favorable traits in a particular environment. c. traits that are acquired as an organism lives its daily life. d. traits that cause an organism harm.

Which technique is used to separate the different cell parts?

Where does the mitochondrial DNA originate?

Which structure of a protein is the arrangement of polypeptides? A - primary B - secondary C - tertiary D - quaternary

Describe Three functions of reproduction

What is the primary function of the respiratory system? Question 5 options: 1) Transportation of blood 2) Oxygenate blood 3) Absorption of nutrients 4) None of the above