What barrier separates a cell from the external environment?

Which of the following types of reactions would decrease the entropy within a cell? a. anabolic reactionsb. hydrolysisc. respirationd. digestione. catabolic reactions

Of the six categories of nutrients, which three produce energy when they're consumed? A. Lipids, vitamins, and proteins B. Proteins, lipids, and minerals C. Carbohydrates, lipids, and proteins D. Minerals, carbohydrates, and proteins

What distinguishes a plant cell from an animal cell

Provide an explanation for the fact that α-d-mannose is more stable than β-d-mannose, whereas the opposite is true for glucose.

Why is it particularly useful to study identical twins who were raised in different environments? a. it is possible that high concordance rates between identical twins reared together is due to their being treated more similarly than nonidentical

A scientist presents the findings from her latest research at a scientific conference. Several scientists in the audience question her analysis. Which of the following is the best response to the criticism? A.

A commonly used medication to treat hypothyroidism is A. glipizide. B. levothyroxine. C. metformin. D. glitazone.

Which of the following processes includes all the others? a. osmosis b. diffusion of a solute across a membrane c. passive transport d. transport of an ion down its electrochemical gradient

How do mutations allow for viruses to become more widespread?

What are the two subdivisions of the Precambrian Era called?