Which is a component of the biosphere: A. Mountains B. Permafrost C. Bacteria

D. Argon

The structure of DNA resembles a twisted ladder. Which structural components form the rings of the ladder? A) deoxyribose sugars B) phosphate groups C) nitrogenous base pairs D) ribosomes

A scientist discovers a new virus with a linear, RNA genome surrounded by a helical capsid. The virus is most likely a member of which family based on structure classification?

What is the difference between vertebrates and invertebrates

Which of the following describes an organ system? a group of atoms working together a group of cells working together a group of tissues working together a group of organs working together

A food chain shows the flow of energy in an ecosystem. Choose an ecosystem and describe a food chain of four organisms that includes at least one producer

A nurse is assessing a client with a diagnosis of primary open-angle glaucoma. which ocular symptom should the nurse expect the client to report?

The speed of neural impulses along an axon is increased greatly by

True or false: the northern lights are caused by earth magnetic field

Which of the following is a function of the nucleus? A) stores DNA B) stores sugars C) builds proteins D) packages proteins

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