Which cell structure is referred to as the gatekeeper because it directs substances to move into and out of the cell? a cell wall b nucleus c vacuole d cell membrane?

The nucleus of the nerve cell is located within the

If you throw away an empty mineral water bottle, it will polutute the land. If you burn it, it will cause air pollution. Can you think of a way of avoiding both?

Two proteins in the same cell perform di erent functions. This is because the two proteins are composed of

Which tropic level of a food chain consists of secondary consumers?

Jerry is older than Susie, and Susie is older than Lauren. Therefore, Jerry is the oldest. This is an example of A. deductive reasoning B. Identifying a hypothesis. C. designing a family tree D. inductive reasoning

Which transports digested lipids and bile across digestive fluids to the surface of mucosal cells? a. LDL'sb. micellesc. HDL'sd. chylomicrons

Which biomes contain a limnetic zone surrounded by a littoral zone? A. rivers and streams B. estuaries C. coral reefs D. ponds and lakes E. oceans

QUICK! In a developing embryo, what process allows cells of the mesoderm to give rise to muscle, bone, and heart tissues? Select one: a. cell differentiation b. cell depolarization c. cellular respiration d. cellular replication

According to the fluid mosaic model of the cell membrane, a. there are fats floating in the protein layer. b. carbohydrates function as membrane channels. c. nonpolar ends of phospholipids are exposed to water inside and outside the cell. d.

What is the actual meaning of the suffix - metry?