Which of the following body system does the immune system rely on to provide the first line of defense against pathogens

The aromatic amino acids are synthesized in humans by a pathway beginning with reaction of indole with serine. synthesized in bacteria in a pathway shared by all three, up to the production of the intermediate chorismate.

Many computer chips are manufactured from silicon, which occurs in nature as SiO2. When SiO2 is heated to melting, it reacts with solid carbon to form liquid silicon and carbon monoxide gas. In an industrial preparation of silicon, 155.

Each element in the periodic table is assigned an atomic number. This number is the same as?

What Is the [H+1] of 8.1•10-8

A container holds 1 mole of helium gas. The volume of the container is 2 liters and the pressure inside the container is 105.0 kPa. If the volume of the container is decreased to 1.5 liters, what will be the new pressure inside the container?

Explain why many compounds that contain one or more hydrogen atoms are not classified as arrhenius acids

pure substance x is a green powder. when heated, it gives off a gas and changes to a black powder. is substance x an element or a compound? give reasons

What amount (moles) is represented by each of these samples? a. 20.0 mg caffeine, c8h10n4o2 b. 2.72 1021 mo?

A sample of gas occupies 40.0 mL at - 123°C. What volume does the sample occupy at 27°C if the pressure is held constant? V1T2 = V2T1 Don't forget to convert temperature to kelvin! Group of answer choices 8.80 mL 20.0 mL 80. ML 182 mL

How much Na2Co3 is needed to produce 35g of Na2Co3?