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100
Organisms that extract energy from nonliving environmental resources are called  
What is producers
100
Organisms that obtain energy by consuming other organisms are called
What is heterotrophs
100
name and classifying living organisms is called
What is taxonomy
100
An inert substance that resembles the treatment given to an experimental group is  
What is placebo
100
The primary building block (monomer) of nucleic acids is  
What is nucleotide
200
degrades molecules and organelles and maintains water pressure in plant cells
What is central vacuole
200
A substance with a pH of 8 is a
What is weak base
200
The three domains in the Woese system of classification are
What is archaea bacteria and eukarya
200
Organic molecules are defined as chemical compounds that contain
What is carbon and hydrogen
200
An organelle found in plant cells and some members of the kingdom Protista, but not in animal cells, is  
What is chloroplast
300
In an experimental procedure, what response of the phenomenon is measured by the investigator?  
What is dependent variable
300
The primary structural component of a cell membrane is
What is phospholipid
300
In an experimental procedure, what is manipulated by the investigator to determine whether it influences the phenomenon of interest?  
What is independent variable
300
How do human sperm move to find the egg?  
What is flagella!
300
is a chemical that absorbs hydrogen ions from a solution.
What is a base
400
atoms share electrons in this bond
What is covalent bond
400
total number of protons and neutrons of an atom.
What is mass number
400
A process by which cells break polymers down into smaller units is  
What is hydrolysis
400
atoms of opposite charges attract each other in this type of bond
What is ionic bond
400
the knowledge that chloroplasts and mitochondria resemble bacteria is called the ____________ theory
What is endosymbiotic
500
The four nitrogenous bases found in RNA are
What is ACGU
500
is a chemical that adds hydrogen ions to a solution.
What is acid
500
A junction that is a protein channel linking the cytoplasm of adjacent cells is called  
What is gap junction
500
Which of the following do plants use to transport nutrients between adjacent cells?  
What is plasmodesmata
500
What type of membrane protein is involved in creating anchoring junctions between animal cells?  
What is adhesion proteins