Characteristics of life
What is the most basic unit of life?
a cell
This is an educated guess that can be tested through an experiment
a hypothesis
What are the building blocks of all matter?
atoms
Water sticking to another surface, such as rainwater sticking to a car, is called what?
Adhesion
What are the four major classes of biological macromolecules?
Carbohydrates, lipids, proteins, and nucleic acids.
Which characteristic of life explains why a child’s arms and legs become longer and stronger as they get older?
growth & development
“The snake is 10 cm long” is an example of what type of data?
Quantitative
What is the mass number of an atom?
the total number of protons and neutrons
Water molecules sticking to other water molecules is called what?
Cohesion
Galactose is an example of which macromolecule?
A carbohydrate.
Living things keeping their internal conditions stable is called this.
Homeostasis
In an experiment, the variable that is purposely changed by the scientist is called the _________?
independent variable
An atom has 6 protons and 8 neutrons. What is its mass number?
14
A solution that resists changes in pH is called a what?
a buffer
What type of macromolecule makes up the main structure of cellular membranes?
Lipids
A plant bends toward sunlight. Which characteristic of life does this demonstrate?
Response to the environment (stimuli)
In an experiment, the variable that is measured or observed as a result of the change is called the __________?
dependent variable
Isotopes of the same element have the same number of what and different numbers of what?
The same number of protons and different numbers of neutrons.
What is the difference between an acid and a base?
Acids have a pH below 7 and bases have a pH above 7.
What are the building blocks of proteins and enzymes?
Amino acids
Explain why the ability to move is not considered a characteristic shared by all living things, and give an example.
Not all living things can move from place to place.
example: plants do not locomote.
A student completes 100%, 50%, or 0% of their chores. The student earns $10, $5, or $0 based on how many chores they complete. Identify the independent and dependent variables.
A covalent bond forms when atoms do what with electrons?
They share electrons.
In a solution of sweet tea, identify the solvent and the solutes.
Explain what happens when an enzyme becomes denatured.
Its shape changes, causing the active site to no longer function properly, so the enzyme may stop working.
this may be due to a change in pH or heat