bio actual quiz

Amount of bacterial growth measured by amount of colonies.

DV

When designing an experiment, scientists will test a relationship between a "cause" and an "effect." The "effect," also represented by what the scientist measures and records, is known as the

DV

Different hand washing methods.

IV

Most of the mass of the atom comes from the nucleus where protons and neutrons are located.

True

The most important element necessary for life that makes up EVERY macromolecule is

carbon

The nucleus of an atom has all of the following characteristics EXCEPT that it

contains nearly all of the atom's volume

No hand washing, just dirty hands swabbed onto plate.

control group

Which particles determine the identity of an element?

protons and electrons

This group also recorded a dependent variable, which is represented by?

the change in mass of the eggs

Leah, LaRenda, and Gabi decide to test what factors influence water absorption by an egg. They remove the shell from 3 eggs by dissolving them in vinegar. They create three different water solutions. One is pure, 100% distilled water, a second is 50% water/50% corn syrup, and the third is 100% corn syrup. The mass of each egg is measured before they are put into a single solution for 24 hours. The mass of the eggs is then measured, and the data recorded below: In this experiment, the independent variable they are testing is?

the type of solution the egg is place in

Based on the data this group gathered, the most appropriate hypothesis would be?

"If an egg is placed in a pure water solution, then the egg will gain mass."