Which way of moving molecules across a membrane requires energy?

A. meiosis

B. diffusion

C. osmosis

D. active transport

What is the purpose of the piece of filter paper inside the 400 mL beaker?

A current of 0.44 A is passed through a solution of a ruthenium nitrate salt, causing reduction of the metal ion to the metal. After 25.0 minutes, 0.345 g of Ru (s) has been deposited. What is the oxidation state of ruthenium in the nitrate salt?

What are the characteristics of allosteric enzymes? a. They conform to Michaelis-Menten kinetics. b. They may have binding sites for regulatory molecules that are separate from active sites. c.

The activation energy decreases with increase in temperature. why?

Gas giants are known for their a. rocky exteriors. c. lack of satellites. b. ring structures. d. closeness to the sun.

The balanced equation for the generation of sugar from sunlight water and co2 is

Isotopes of the same element have different ... A. Positions on the periodic table b. atomic numbers C. Mass number

How many moles of O2 are needed to make 1.98 moles of SO3

How many protons are in the nucleus of isotopes L?

What is the empirical formula for a compound that contains 38.77% Cl and 61.23% O?