Which phrase best describes cellular respiration?

a. the process by which the cytoplasm physically divides

b. the process where the cell utilizes energy from food

c. the process where a membrane allows the movement of water through it

d. the process where distribution of molecules is balanced out by their movement

Pentane with molecular formula c5h12, exists in three isomeric forms. one shows linear carbon chains, another has one -ch3 groups present on the third carbon atom, and the third has two -ch3 groups present on the second carbon atom. what types of isomers are these? a. geometric isomers b. structural isomers c. halotropic isomers

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.

Question 17 (1 point) where does penicillin come from? a. it is a chemical that man invented b. it is a fungus c. it is a toxin made by other bacteria d. it was discovered in archaebacteria