1. In the first step in the life cycle of a star, it is called a:

A. red giant

B. main sequence period

C. protostar

D. white dwarf

Which of the biomolecules stores energy?

Which scientist conducted tests on extracts made of bacteria to show that the genetic material in bacteria is DNA? a. Martha Chase b. Oswald Avery c. Frederick Griffith d. Alfred Hershey

How is artificial selection different from natural selection? artificial selection changes traits but not genes. artificial selection is the only kind of selection that occurs in the modern era.

How does the pathogen proliferate within the human host?

Considering the impacts and benefits of applying environmental biotechnology to clean polluted water systems, which of the following describes the most likely impact? It may introduce new bacteria to the system.

What type of blood vessel usually carries oxygen rich blood

Give four reasons why organic material is good for the soil.

What is true about psychosocial changes observed in adolescents? select all that apply?

This causes substances to move across the cell membrane, against the concentration gradient. Select one: a. active transport b. neutral transport c. passive transport d. hydrophobic transport

1. The nerve impulse is an electrical current that travels along dendrites or axons. True or false