1.What do you call the number in front of a chemical formula that tells how many atoms or molecules of a substance take part in the reaction? A) yield

B) coefficient

C) symbol

D) subscript

2.A balanced equation has ?

A) the same number of reactants as products

B) the same total number of coefficients on both sides of the equation

C) the same number of each kind of atom on both sides of the equation

D) an equal number of molecules on both sides of the equation

3.In a chemical reaction, the total mass of the products .

A) must always be the same as the total mass of the reactants

B) is always less than the total mass of the reactants in an open system

C) can be greater or less than the total mass of the reactants

D) must be less than the total mass of the reactants

4.Due to the principle of conservation of mass, .

A) all chemical formulas have coefficients

B) all chemical reactions must have an equal number of reactants and products.

C) all chemical reactions must take place in open systems

D) all chemical equations must be balanced

help me please

Match the digestive enzymes to the macromolecules they to digest. break down fats into glycerol and fatty acids break down carbohydrates into simple sugars break down nucleic acids into nitrogenous bases and simple sugars break down proteins into amino acids

Mouse liver cells were homogenized and the homogenate subjected to equilibrium density-gradient centrifugation with sucrose gradients. fractions obtained from these gradients were assayed for marker molecules (i. e., molecules that are limited to specific organelles). the results of these assays are shown in the figure. the marker molecules have the following functions: cytochrome oxidase is an enzyme involved in the process by which atp is formed in the complete aerobic degradation of glucose or fatty acids; ribosomal rna forms part of the protein-synthesizing ribosomes; catalase catalyzes decomposition of hydrogen peroxide; acid phosphatase hydrolysis monophosphoric esters at acid ph; cytidylyltransferase is involved in phospholipid biosynthesis; and amino acid permease aids in transport of amino acids across membranes. a) name the marker molecule and give the number of the fraction that is most enriched for each of the following cell components: lysosomes; peroxisomes; mitochondria; plasma membrane; rough endoplasmic reticulum; smooth endoplasmic reticulum.

In each transformation of energy , some energy what?