BIO MID TERM EXAM Pt 1

Pure substance that consists entirely of one type of atom

Factor in a controlled experiment that is deliberately changed (manipulated variable)

Type of mixture in which all the components are evenly distributed.

Group of organs that work together to perform a specific function

Compound that prevents sharp sudden changes in pH

Center of an atom that contains protons and nuetrons; In cells, structure that contains DNA

A sub unit of nucleic acids made of 5 carbon sugar, phosphate group & nitrogenous base

Protein catalyst that speeds up the rate of specific biological reactions

The scientific study of life or living organisms

An atom that has a positive or negative charge is called

Group of tissues that work together to perform closely related functions

The dissolving substance in a solution.

Relatively constant internal physical and chemical conditions that organisms maintain.

What is the role of enzymes in living things?

Smallest unit of most compounds that displays all the properties of that compound.

Force of attraction between different kinds of molecules

Group that is exposed to the same conditions as the experimental group except for 1 independent

Substance that speeds up the rate of a chemical reaction

Group of small cells that perform a particular function

Experiment in which only one variable is changed.

Material composed of 2 or more elements or compounds that are mixed together but not chemically

Small chemical unit that makes up a polymer

Variable that is observed and that changes in response to the independent variable; responding

Possible explanation for a set of observations or possible answer to a scientific question

Compound with an amino group on one end and a carboxyl group on the other

Mixture of water and nondissolved material

What is an atom?

Attraction between molecules of the same substance

Molecule composed of many monomers.

Substance formed by the chemical combination of 2 or more elements in definite proportions.

Energy that is needed to get a reaction started

Organized way of gathering and analyzing evidence about the natural world.

Negatively charged particle located in the electron cloud

Reproduction involving a single parent that results in offspring that are genetically identical

Combination of chemical reactions through which an organism builds up or breaks down materials.

Genetic material that organisms inherit from their parents.

Slight attraction that develops between oppositely charged regions of nearby molecules

Particular preference or point of view that is personal rather than scientific

Compound that forms H+ ions in a solution; a solution with PH of less than 7

When the concentration of 2 solutions is the same

Reproduction in which cells from 2 parents unite to form the first cell of a new organism

Scale with values from 1 to 14 that measure the concentration of H+ ions in a solution

The substance that is dissolved in a solution.

Part of earth where life exists including land, water and air / atmosphere

Reactant of an enzyme-catalyzed reaction

On or in a cell,specific protein to whose shape fits a specific molecular messenger, Ex hormone

A well-tested explanation that unifies a broad range of observations and hypotheses

Compound that produces hydroxide ions OH- in a solution; PH of more than 7

A logical interpretation based on prior knowledge and experience

A simple sugar molecule

Which molecules make water?

Signal to which an organism responds