In a DNA molecule, what holds together nitrogenous bases from the two polymer chains?

A. phosphodiester bonds

B. ionic bonds

C. covalent bonds

D. peptide bonds

E. hydrogen bonds

How effective was Jonas Salk's initial testing of the polio vaccine?

Which of the main layers of the earth contains convection currents that slowly move lithosphere plates?

Which outcome would you expect when water is removed from an aquifer faster than it is replaced on a regular basis? A. increased reliable surface runoff B. pollution of water within the aquifer C. increasing occurrences of drought D.

Glycolysis with one molecule of glucose a. requires oxygen b. produces 3 ATP molecule c. produces 4 molecule of NAD+ d. may occur under aerobic or anaerobic conditions e. produces one molecule of pyruvate which one is the answer

What problem is the cell having if the area around the cells has a high concentration of sodium ions

Which is NOT a function of the human stomach? A) stores food for short period of time B) breaks up food physically and chemically C) receives food from your mouth directly after swallowing D) HCl produced inside the stomach to aid in digestion

What is a recessive gene? a. The gene that displays itself. b. The hidden gene. c. The gene that is dominant.

Much of the fluid that moves across capillary walls and into the tissues moves as a result of filtration, forced by blood pressure. o2 on the other hand travels from the capillaries into the tissues as a result of what?

Which organisms are extremely small and use hosts as both home and food supply

Explain generaly how Cyclin and Cyclin Dependent Kinase (CDK) work to control the cell cycle.