Select all that apply: Which of the following affect (s) the half-life of a radioactive substance?

A. the type of isotope

B. the temperature of the substance

C. the addition of a catalyst

D. the mass of the substance

Carl Woese and collaborators identified two major branches of prokaryotic evolution. What was the basis for dividing prokaryotes into two domains?

Is viruses simple or complex

What would happen to the possible variation in gametes if the number of chromosome pairs increased from two to three? What if the number increased again from three to four?

Which molecule transports energy from glucose to other parts of a cell

Which of the following will disapear first if an estuary was destroyed A. shellfish B. wales C. coral reefs D. algae

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) ?