If an human cell has 46 chromosomes, how many chromosomes does an human sperm or egg cell contain?

Which organelle contains large amounts of digestive enzymes and breaks down cellular waste products and a wide range of other materials:?

_______________ is any change in the sequence of DNA.

All of the reactions observed in photosynthesis and cellular respiration show cycles of reagents and products.  For example: the CO2 waste from cellular respirations feeds into the reagents required for photosynthesis.  Why is this important for life? 

Cells that experience a lack of oxygen during respiration may experience which of the following effects.

This cellular structure is composed of two phospholipid layers and separates the inside from the outside of the cell from the environment.

______________ is the production of mRNA from DNA.

Air pollution is a major problem in some areas of the world.  Air pollution blocks a portion of the sun’s light from reaching the earth’s surface, which of the processes would be directly affected?

Waxes are lipids with a single fatty acid chain that can be tightly packed, they are used to __________.

Pseudoscience commonly draws conclusions from ___________, which provide small amounts of incomplete evidence to demonstrate a relationships exist.