When does replication occur?

1) Before a cell divides

2) when the body needs to repair itself.

3) After a cell divides

4) Everyday for skin cells.

Explain how to change the physical states of the substance

Internal environment

List and briefly describe the four "spheres" that constitute our environment.

1. in an ecosystem with four levels-producers, primary consumers, and two higher-level consumers-describe where the decomposers operate relative to the other trophic levels. provide at least two examples of organisms at each level.

Describe how dominant and recessive alleles are represented in a Punnett square

An uncomfority represents

Neurotransmitters are secreted into a specialized junction known as the: (a) Synapse (b) Synaptic vesicles (c) Ligand channel (d) Axon

Birch bolete is a fungus that normally grows on the roots of birch trees in New York State. During the life of the fungus and the birch, each organism receives nutrients from the various biochemical processes of the other.

Failure of your immune cells to recognize MHC proteins on your normal body cells might result in which type of condition? Select one: a. Leukemia b. Auto-immune diseases c. HIV d. Cancer

The purpose of the Human Genome Project was to: a. map the nucleotide sequence and identify the genes on each human chromosome. b. identify spontaneous alterations in genetic material caused by teratogens. c.