According to cell theory, which activity is impossible?

A. Skin cells forming from sunlight

B. Liver cells forming from liver cells

C. Prokaryotes existing by themselves

D. Ribosomes being present in eukaryotes

Myoglobin stores A) oxygen. B) glycogen. C) ATP D) calcium ions. E) glucose.

What are the proteins that are used to speed up the break down of food during digestion?

What enzyme corrects errors during replication? DNA polymerase DNA ligase DNA lactase DNA helicase

In the human body a negative feedback loop is a type of self regulatory control of hormone reproduction True or false?

How does the current, or sixth, mass extinction differ from the past five mass extinction events? A. The sixth mass extinction is believed to be caused by human-related factors. B. The sixth mass extinction is believed to be caused by natural forces.

The DNA in a cell's nucleus encodes proteins that are eventually targeted to every membrane and compartment in the cell, as well as proteins that are targeted for secretion from the cell.

What similarity do animals and plants share?

This is a model of a bacterial cell. What statement about the structure and function of bacterial cell parts is correct? A) DNA is contained in a primitive nucleus. B) Energy for movement is generated in the pilli.

How can the locations where ancient fossils are found be used as evidence for continental drift

Many songbirds breed in North America in the spring and summer and then migrate to Central and South America in the fall.