Water Wonders
The property of water that allows a drop of water to stay together on a penny
What is cohesion?
The monomer of proteins
what are amino acids?
The part of an enzyme where the substrate binds called
what is the active site?
subatomic particles found in the nucleus of the atom
what are protons AND neutrons?
a solution with a pH of 2
what is acidic?
The property of water that helps maintain a stable internal body temperature in humans
Macromolecule made of rings of carbon, hydrogen, and oxygen.
what are carbohydrates?
enzymes lower this which speeds up the chemical reaction
what is activation energy?
The type of bond that involves the sharing of electrons
what is a covalent bond?
what is increases?
Why can insects like water striders walk on the surface of a pond?
Surface tension created by cohesive water molecules
describe the difference between dehydration synthesis and hydrolysis
DS: loosing a water molecule to create a bond between two monomers
H: gaining a water molecule to break the bond between to monomers in a polymer
this happens to an enzyme if the temperature becomes to high
what is denaturing?
the atomic mass of an atom with 8 protons and 8 neutrons
what is oxygen?
what is equal?
Explain how water’s polarity makes it an effective solvent
What is positive hydrogen and negative oxygen ends of water attract charged or polar molecules?
provide a function for each macromolecule
answers vary
carbs: energy storage or structure
lipids: energy storage or insulation or membrane structure, etc.
proteins: movement, support, catalyst, etc.
nucleic acids: storing genetic info
In a reaction, enzyme A works best at pH 2 and enzyme B works best at pH 8. Hypothesize about the location of these enzymes in the human body
what are different organs?
specifically, stomach for Enzyme A and small intestine or pancreas for Enzyme B
metals become this in an ionic bond
what is a cation?
A scientist wants to test whether light affects the rate of photosynthesis. Identify the independent and dependent variables.
what is
Independent – light intensity; Dependent – rate of photosynthesis (oxygen produced)
During transpiration, water moves upward through plant vessels. Explain which two properties of water make this possible and how they work together.
What is cohesion (water molecules stick to each other) and adhesion (water molecules stick to plant)?
A sample from a food source contains carbon, hydrogen, oxygen, and nitrogen. What two macromolecules could it potentially be, and how could you tell which one it is?
Protein or nucleic acid; test for presence of phosphorus (nucleic acids contain P, proteins usually do not).
A student tests the effect of salt concentration on catalase activity. Identify the independent, dependent, and two controlled variables.
what is
Independent – salt concentration; Dependent – rate of reaction (oxygen produced); Controlled – enzyme amount, temperature
the type of bond where two atoms have unequal attraction for shared electrons
what is a polar covalent bond?
One reason why it’s important to include constants and a control group in an experiment
what is
constants ensure that only one variable is tested; a control group provides a baseline for comparison