What four-carbon compound is regenerated at the end of the Krebs cycle? With what two-carbon compound does it combine at the start of the Krebs cycle?

Test a hypothesis using scientific inquiry

When you are finished running the bases you are sweating and you feel thirsty what body systems are interacting in this case

Which theory states that the more recent species are changed descendants of earlier species? biological evolution natural selection descent with modification

If a diploid cell with 8 chromosomes goes through meiosis, how many chromosomes will the resulting haploid cells have?

What are limiting factors? Give 3 examples.

A scientific name has to refer to what

The changes in the surrounding environment can have an effect on plants too for a few weeks on the autumn season normally green leaves of deciduous plants acquire a red to yellow color how and why does this change in color happen?

Many of the biochemical reactions that occur within cells are catalyzed by enzymes. Which of the following statements is true about most enzyme-assisted reactions?

A cheeseburger from a fast food restaurant contains 19 g of fat, 20 g of carbohydrate, and 28 g of protein. How many kcal of energy does the cheeseburger contain

How do enzymes catalyze chemical reactions (don't just say "they lower the activation energy", give me specific mechanisms) ?