This organelle is responsible for regulating the passage of materials in and out of the cell?

How do the resulting cells, from each round of mitosis, compare with the starting cells of that round in terms of chromosome type? Number of cells?

A restriction enzyme has a 4 bp recognition sequence. Assuming equal frequency of all four bases in a 5,000 bp linear section of DNA, how many fragments (rounded answer) would you expect to see on an electrophoresis gel?

Certain disorders, such as sickle cell anemia, are linked to specific genes. Some scientists would like to use gene therapy to cure such disorders. Gene therapy involves replacing the nonworking cells with cells that have been genetically altered.

What are the layers of the atmosphere starting from the surface to space

The branchlike fibers extending in clusters from the neuron's cell body are called

How are all living thing made of cells

Which is am example of an internal stimulus? A) an increase in the amount of water available to a plant B) an artificial light attracts insects C) a decrease in oxygen levels in the blood during exercise D) a sudden change of air temperature

How dose one determine when an ecosystem is in balance

How does respiratory system relate to respiration making ATP?

What is the largest group of reptiles that ever lived?