Only one ______ can be manipulated at a time in an experiment.
An experiment needs to have a _______ to base a standard on.
On a graph the _____ ______, which is the part of an experiment that is manipulated, is recorded on the horizontal axis.
_______ of living things are recorded in the lab and in the field.
The first step in the scientific method involves _____.
An ______ is a conclusion based on observations and scientific knowledge.
What are the 7 parts of the scientific method?
hypothesis, control, constants, independent variable, dependent variable, and validity.
Orchids were studied to determine if the amount of humidity affected the flowering of these plants.. What was the indepentent variable in this experiment?
THe percentage of humidity
What would be the best resource to research the symptoms & treatments of hypoglycemia?
A New England Journal of Medicine
Control groups allow _____ between subjects receiving a treatment and those receiving no treatment.
How do you validly determine how a change in the pH of water affects the population growth rate of algae?
Use the same species of algae in all trials
The elements carbon, _____, nitrogen, and _____ make up the majority of all living things
hydrogen & oxygen
Carbon, hydrogen, nitrogen, and oxygen are all ______.
____'s atomic structure allows it to form the following macromolecules necessary for life
(sugars) provide energy for organisms, made up of fatty acids
(fats) insulate in transport, movement, and cell regulations made up of amino acids
(DNA and RNA), control cell activities in protein synthesis, made up of nucleotides
Proteins are made by linking together _____ acid ______s
special proteins that can act as catalysts. They are specific in the function and bond to one active site on a substance
What liquid is necessessary for life to continue?
What kind of solvent is water?
What liquid is polar?
Can water absorb large or small amounts of heat?
Why do lakes & oceans have the ability to stabilize air & land temps.?
because water can absorb large amounts of heat
What should the pH of water be?
Is a pH below 7 acidic or non-acidic?
Is a pH above 7 acidic or non- acidic?
How much of a cell is made up of water?
Can high temperatures or extremes of pH irreversibly change the structure of proteins and alter their funtion?
Proteins are formed for monomers called
Is water slightly more acidic than air?
Is water's solid form more or less dense than its liquid?
Why do enzymes work only with specific substrates?
Each substrate has a specific activation site for enzyme attachment
What molecule is most abundant in the cells of the human body?
What benefit does sweating provide?
It cools the skin with evaporation
Peroxidase is an enzyme that breaks down hydrogen peroxide in cells. It accomplishes this because of its structure. What part of the enzyme is involved in catalytic activity?
Prokaryotic cells are
typically small cells without a nucleus or membrane bound organelles. (Bacteria) THese types of cells are the simplest life forms and were the Earth's first types of cells.
Eukaryotic cells are
typically larger cells with a nucleus and membrane bound organelles.
contains DNA & is the control center
site of protein synthesis
site of photosynthesis
power house of cell; cell respiration --> ATP
transports material within the cell
packages for export
contain digestive enzymes
looked at cork, coined the term cell
looked at living things
The important functions of the membrane include:
diffusion, osmosis, active transport, recognition site for self & foreign invaders
occurs in cells when substances move from an area of high concentration to an area of low concentration
osmosis is the
diffusion of water
why can't single celled organisms grow very large?
the diffusion of nutrients into the cell would be too clow
what led to the cell theory?
The ability to see microscopic things
What does the cell throry state?
Cells are the basic unit of structure & function for all living things & that cells come from pre-existing cells