Which always contains carbon, hydrogen and oxygen?
i. carbohydrate
ii. protein
iii. fat
a. i and ii only
b. i and iii only
c. ii and iii only
d. i, ii and iii

Chicken pox and hepatitis are bacterial diseases. true or false?

Most animal cell membranes have proteins that pump. ions out of the cell and potassium ions into this

2. which of the following statements does not accurately describe stem cells? a. embryonic stem cells make up the inner cell mass of a blastocyst. b. with more research, stem cells may be used to repair or replace damaged cells. c. the use of stem cells is without any objections since it can be used in therapies to humans. d. adult stem cells are multipotent and can differentiate into many types of cells.