Scientific Method and Scientific Information
A student wants to create a graph showing the four kingdoms as fractions of living things on earth. Which graph type would be best for this?
Pie chart/circle graph
Describe three attributes of a dissection scope
It can give us a 3D image of a specimen, it has a slightly lower magnification to a compound scope, it is made of 2 compound scopes pointed at the same sample, it can use live specimens
what is an ionic bond?
When electrons are stolen/transferred from one atom to the other
3 fatty acids and a glycerol
Cohesion is...
when a molecule is attracted to itself
Most primary source information about science is found in which form?
periodicals (peer reviewed work!)
what two microscopes require a special certification to use?
TEM and SEM
what is a covalent bond?
when electrons are shared between atoms
what is the polymer of lipids?
triglycerides
capillary action in plants is possible because of this property of water:
adhesion
anecdotal evidence
what does TEM stand for, and what does it mean?
Transmission electron scope; shoots electrons through a specimen
what does it mean to be a polar molecule?
name 3 functions of proteins
catalyst, defensive proteins, storage, transport, support, motion, messenger
Why is water a universal solvent?
because it is highly polar so it dissolves many substances
When you look for empirical evidence that relates to an experiment, what are you doing?
reviewing the direct observations on the subject; observations based on evidence
what are the two kinds of light microscopes?
dissection and compound
When are hydrogen bonds strong?
When there are many
name the 4 nucleotides that act as a monomer for nucleic acids (specifically DNA)
adenine, cytosine, thymine, guanine
Acids have a pH of...
1-6
What are the 6 steps of the scientific method in order?
observation
hypothesis
experiment
collect data
analyze data
conclusion
How does a SEM work?
it scans a narrow beam of electrons onto a specimen then it collects those electrons and projects them
What is a valence electron?
the outermost electrons in an atom
phospholipids make this part of the cell...
the cell membrane
pH is a measure of what type of atoms?
H+