(1)which of the following organelles is the control center of a cell?
a. mitochondrion
b. ribosome
c. nucleus
d. chloroplasts?

(2) the invention of the microscope made it possible to discover what?

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]