The first line of defense involves which structure (s) ?

T-cells

B-cells

blood

skin

Which would most likely be happiening in cancer cells

How is the heart of a turtle different from the heart of a crocodile? a. the turtle heart lacks a divided ventricle. b. the turtle heart has four chambers c. the turtle heart lacks a divided atrium d.

The study of what structure was instrumental in the formulation of the modern cell theory

Plants have a more complex level of cell organization than any other kingdom. a. True b. False

Which is a characteristic of all nonfoliated metamorphic rocks?

A scientific name has to refer to what

The changes in the surrounding environment can have an effect on plants too for a few weeks on the autumn season normally green leaves of deciduous plants acquire a red to yellow color how and why does this change in color happen?

Many of the biochemical reactions that occur within cells are catalyzed by enzymes. Which of the following statements is true about most enzyme-assisted reactions?

A cheeseburger from a fast food restaurant contains 19 g of fat, 20 g of carbohydrate, and 28 g of protein. How many kcal of energy does the cheeseburger contain

How do enzymes catalyze chemical reactions (don't just say "they lower the activation energy", give me specific mechanisms) ?