Themes in Biology
What is the smallest unit of life?
A Cell
This type of feedback process REDUCES the original stimulus. Ex: Sweating
Negative Feedback
What is the standard unit used to measure the mass of atomic particles?
Dalton
A type of bond where electrons are shared between atoms
Covalent Bond
The oxygen atom in a water molecule pulls the electrons that it shares with hydrogen closer to itself, creating a _________covalent bond.
Polar
This type of feedback AMPLIFIES an original stimulus. EX: Blood Clotting (activated platelets attract more platelets).
Positive Feedback
How many different nucleotides form DNA?
4!
Lose
A type of covalent bond where atoms are shared unequally, such as with water.
Polar
Mrs. Murdick wants to know if students who get more sleep will do better on their quiz. What is the Independent Variable in this situation?
Trees, soils, and Salamanders. What level of biological organization would all three of these be included in?
Ecosystem
Name that theme!
Living systems are __________ ____________, meaning that they must interact with their environments, exchanging matter and energy.Open Systems
This group of elements has full electron shells, making them unreactive.
Group 18 / Noble Gases
In what direction does electronegativity increase on the periodic table?
Right and up
Mrs. Murdick wants to know if students who get more sleep will do better on their quiz. What is the Dependent Variable in this situation?
Grades on Quiz
A researcher is studying a group of Gazelles. What level of biological organization are they studying?
Population
Name that theme!
Nerve cells are long and thin to effectively relay electrical signals throughout the body. What theme is this an example of?
Structure and Function
List ALL 4 of the elements that make up 96% of living matter.
Oxygen, Carbon, Hydrogen, Nitrogen
Would two hydrogen atoms bonded together create POLAR or NONPOLAR molecule?
NONPOLAR
During childbirth the head of the baby pushes against the cervix, which signals to the brain to release oxytocin. This hormone increases the intensity and frequency of uterine contractions, pushing the baby's head harder against the cervix, which in turn causes even more oxytocin to be releases. What type of feedback mechanism is this an example of?
Positive Feedback
Name that THEME:
Groups of birds exhibit flocking behavior. This trait is not seen at the level of the organism, but it is seen at the population level. What theme is this an example of?
Emergent Properties
List 2/3 of the criteria for a cell under modern cell theory?
Options:
1. All living things are made of cells
2. Cells are the basic units of living things.
3. All cells arise from pre-existing cells.
In a covalent bond shared between two hydrogen atoms, how many electrons are shared in total? (Hydrogen has an atomic number of 1).
When an atom loses an electron during bonding, it is known as a ____________.
CATION
A certain atom has 20 protons and 18 electrons. What is the overall charge of this atom? Give a NUMBER AND A CHARGE (negative, positive)
2+