In kidney cells, charged ions like sodium and chloride are reabsorbed from the urine against a concentration gradient. Which mode of cellular transport is employed here?

Which of the following diseases is caused by a spirochete? tularemia relapsing fever rheumatic fever Rocky Mountain spotted fever

Fertilizers used to improve lawns and gardens can interfere with the equilibrium of an ecosystem. Why is this true? A They can be carried into local water supplies. B They cannot be absorbed by roots. C They cause mutations in all plants.

Describe the unique appearance of diatoms. what chemical compound composes their outer covering, and what is this shell called? how does the diatoms' habitat enable them to photosynthesize?

Ecologists are studying the fire coral population in a 280-square-kilometer area on the Great Barrier Reef. Fire corals cannot move from one location to another in their environment.

Sometimes a natural resource is located in an environmentally sensitive area. Obtaining the resource in these locations can ... A. create more diverse ecosystems. B. supply additional resources with no negative side effects. C.

Which statement is correct about the total mass of glucose and oxygen formed during photosynthesis? It is equal to the total mass of carbon dioxide used. It is less than the total mass of carbon dioxide used.

If George is startled by a loud noise immediately after his baby sister cries, he is likely to become fearful every time she cries.

When the believer confesses his, he is cleansed by the blood of?

How does a vascular plant's phloem differ from its xylem? A. Phloem is found only in the leaves. B. Only phloem transports water. c. Only water flows through phloem. D. Phloem has a two-way flow of materials,

Many mutations have been identified in the lac operon. A particular mutation prevents the repressor protein from binding to the operator under all circumstances.