From which sphere of Earth did this food originate?

A.

biosphere

B.

atmosphere

C.

troposphere

D.

hydrosphere

E.

geosphere

Used by cells as an energy source?

Alternative routes of blood supply are called

The most obvious source of gene flow into any population is A) Emigration B) Immigration

Select statements that accurately describe receptor tyrosine kinases (RTKs). a) The intracellular domain has phosphatase domains. b) Some RTKs are dimeric in the presence of a ligand.

How is viral reproduction different from that of cell-based organisms?

Subjects with a serious illness may be at risk for exploitation because they may be desperate for a possible cure. This is an example of:

When two pink flowers (RW ) are crossed, there are four equally likely possible outcomes for the genetic makeup of the offspring: red (RR ), pink (RW ), pink (WR ), and white (WW ).

How does gene therapy affect a cell? A. Cells with functioning genes are replaced with mutated genes. B. Cells with normal genes are replaced with cells of defective genes. C. Cells with abnormal genes are replaced with cells of destructive genes. D.

The table below shows the fossils found in various layers of an undisturbed rock: Fossils In Rock Layers Layer (from top) Fossil in Layer 1 A, C 2 E 3 A, D, F 4 B 5 F, C 6 D, B Which is most likely an index fossil? A B D E

Explain what could happen to the community if all the frogs suddenly died. Which organisms will die? Which organisms will over populate? Why?