The twisted shape of DNA is called a.

a. double ladder

b. double helix

c. nucleotide

d. base pair

What do you call the phenomenon when you have a different concentration of materials on the inside and the outside of the cell?

You are working with a team of scientists who are investigating the biochemical control system involved in how animals digest fats in their meals.

What part of phospholipid is hydrophobic

Which phrase best describes the apical meristem of plants

4. If a scientist is observing biotic and abiotic factors, which of the following level of organism must she be studying? A. An ecosystem B. A community C. A population D. An individual organism

Animals are motile because they have: a. energy b. metabolism c. nerve and muscle fibers d. legs or wings

Radiation generated by the big bang cooled and is now detectable as microwaves. t/f

What's an easy way to remember the definition of biome?

What causes lighting

Urinary system keeps the pH of the blood around