Why is it not possible to completely convert thermal energy into mechanical energy

The symptoms of an immune complex reaction are due to

How do intracellular communication and intercellular communication differ? Intercellular communication involves an electrical charge moving along a cell membrane. Intercellular communication involves moving a molecule within a cell.

Which best describes a difference between transcription and DNA replication?

A moth learns to visit nectar-filled white flowers, and the good food source allows it to lay more eggs and have more surviving offspring than other moths in the area. Which of the following can you conclude? a. This moth has white coloration b.

A student gets a cut on his hand. Within a week, the cut has healed and there is little evidence of the original injury.

If nothing ever eats a shark, what will eventually happen to the energy that is stored in its body?

The purpose of PCR is to. A) make more copies of DNA primers to increase protein synthesis. B) make many copies of an organism's DNA sequence so a small number of organisms will become large enough to be identified.

Homologous structures are structures found in one species that have the same basic anatomical structure and embryonic origin as those found in another species.

1. What was the worldwide avemge life expectancy in 2000? a. about 30 c. almost 80 b. more than 67 d. none of the above

Answers - does exercising release endorphins?