CHEMISTRY
HCL is considered...
a. Basic b. Acidic c. Neutral d. Poisonous
HCL (Hydrochloric acid) is ACIDIC and found in the stomach to help digest foods
What is the basic unit of life?
Cells
What is an example of something that is hydrophilic and hydrophobic?
Hydrophilic: Substances that dissolve well in water (water-loving) i.e., salt
Hydrophobic: Substances that do not dissolve in water (water-fearing) i.e., oil
What molecule contains the genetic instructions used by living organisms?
DNA
What is Miss Conlon's favourite colour?
Green
If something is 11 on the pH scale, is it basic, acidic, or neutral
Basic like Ammonia, bleach, or soap.
What organelle is known as the “powerhouse of the cell"?
The mitochondria
What percentage of the human body is approximately made up of water?
Approximately 60%
Arrange these levels of biological organization from smallest to largest: organism, tissue, organ, cell, organ system.
Cell → tissue → organ → organ system → organism
How many siblings does Miss Conlon have?
6!
NaCl is an example of a covalent or ionic bond? Explain.
Covalent bond is when atoms share electrons like in H2O.
What is the main difference between a prokaryotic and eukaryotic cell?
Eukaryotic cells have a nucleus and membrane-bound organelles
Prokaryotic cells do not.
What is the difference between cohesion and adhesion?
Cohesion is the attraction between water molecules, while adhesion is the attraction between water and other substances.
What characteristic of life allows an organism to maintain relatively stable internal conditions?
Homeostasis
Which doesn't belong?: Nucleus, mitochondria, ribosome, DNA
DNA
A substance has a pH of 3 and another has a pH of 6. Which substance has the higher concentration of hydrogen ions (H⁺)?
he substance with a pH of 3.
NOTE: It has approximately 1,000 times the H⁺ concentration because each pH unit represents a 10× change.
A cell has a nucleus, mitochondria, ribosomes, and a cell membrane, but no cell wall or chloroplasts. Is it most likely a plant or animal cell?
An animal cell!
True!
What are the four main elements of life?
Carbon, Nitrogen, Hydrogen, and Oxygen
What subject did Miss Conlon do best in in high school?
History and Civics
A student mixes oil and water in a test tube and shakes it. After a few minutes, the two liquids separate into different layers. Explain why this happens using the concepts of polarity and intermolecular attraction.
Water is polar, while oil is non-polar. Polar water molecules attract other polar molecules, but they do not interact strongly with non-polar oil molecules. As a result, oil and water separate.
A red blood cell is placed into a solution and water moves into the cell. Is the surrounding solution hypotonic, hypertonic, or isotonic?
HypOtonic
Explain why water is essential for maintaining homeostasis in living organisms.
Water acts as a solvent, participates in chemical reactions, transports substances, helps regulate temperature, and provides an environment in which many cellular processes occur.
What are the 10 organ systems in the body?
What is the only organ that can regenerate itself significantly?
The Liver!