Scientific Methods
Water, Water, Everywhere
Chemistry Cram
Macromolecule Mix-up
Cell Sense
100
Which of these tools would be best for studying plant cells? a. a hand lens b. a microscope c. a telescope d. binoculars
b. a microscope
100
What type of bonds exist between water molecules?
Hydrogen bonds
100
What is a compound?
When two or more different elements are bonded together
100
Name the four types of macromolecules
carbohydrates, proteins, lipids, nucleic acids
100
Which organelle is found only in eukaryotes and holds the DNA?
The Nucleus
200
George filled four identical containers with 200 milliliters (mL) of water. In each container, he put different amounts of salt. He placed the containers in front of various windows throughout his house. After one week he measured how much the volume of water had changed in each container. What is one controlled variable in George's experiment?
1. The four identical containers 2. Same amount time for each container
200
What property of water describes why water pulls into a ball-shaped droplet?
Cohesion - particles of the same substance stick together
200
Why is an atom neutral if it contains charged particles? a. The charges move too quickly throughout the atom. b. The neutral particles cancel out any charged particles. c. The individual particles are too small to affect the overall atom. d. Each negative charge is balanced by a positive charge.
d. Each negative charge is balanced by a positive charge.
200
Starches and sugars are examples of which macromolecule?
Carbohydrates
200
Which organelle makes proteins in prokaryotes and eukaryotes?
Ribosomes
300
George filled four identical containers with 200 milliliters (mL) of water. In each container, he put different amounts of salt. He placed the containers in front of various windows throughout his house. After one week he measured how much the volume of water had changed in each container. What is one possible mistake George made in his design?
He changed two variables in the experiment - the amount of salt and the location of the containers. He should only change one variable at a time (either amount of salt OR the location) to see how it will affect the evaporation rate.
300
In a soda, 200 mL of carbon dioxide is dissolved in 2000 mL of syrup. Which is the solvent and which is the solute?
Solvent = syrup Solute = carbon dioxide
300
How does a covalent bond differ from an ionic bond? a. Electrons are destroyed in a covalent bond but created in an ionic bond. b. Electrons are created in a covalent bond but destroyed in an ionic bond. c. Electrons are shared in a covalent bond but transferred in an ionic bond. d. Electrons are transferred in a covalent bond but shared in an ionic bond.
c. Electrons are shared in a covalent bond but transferred in an ionic bond.
300
Enzymes are an example of which macromolecule?
Proteins
300
Which organelle helps a eukaryotic cell digest and break down old cell parts?
The lysosome
400
Which of these statements is correct about the proper and safe use of a microscope? a. Clean the lens of the microscope with regular tissue paper. b. Support the bottom of the microscope while holding the arm. c. Pull the plug before turning off the light source of a microscope. d. Start with the highest magnification when focusing on a new specimen.
b. Support the bottom of the microscope while holding the arm.
400
What property of water explains why water can climb up against gravity?
Adhesion - when particles of different substances stick together
400
Which characteristic makes one element different from another? a. The number of protons b. The number of neutrons c. The number of electrons d. The mass number
a. the number of protons
400
What is one similarity between all macromolecules?
1) all form long chains 2) all contain carbon (C) and hydrogen (H)
400
What is the function of the mitochondria in a cell?
Produce energy (ATP) for the cell from organic compounds Make energy for the cell
500
A student wants to know if temperature affects the amount of salt that can be dissolved in a pot of water. He gathers three identical pots and writes down these steps: 1. Add 400 mL of water to each pot. 2. Let the water in each pot heat for ten minutes on separate water heaters. 3. Measure and record water temperature in each pot. 4. Add salt to each pot, one spoonful at a time, until no more salt will dissolve. 5. Record the number of spoonfuls of salt added to each pot. The student is missing one step. Which step must be added to ensure the data will help him answer his question?
Set each water heater to a different temperature (Ex: Set one water heater to 30°C, one to 50°C, and one to 70°C.)
500
What is one reason why water makes Earth habitable?
1. Water can absorb and retain heat which helps Earth maintain a stable temperature 2. Water is less dense as a solid so it floats when it freezes which allows underwater organisms to survive in cold temperatures 3. Water, through cohesion and adhesion, can travel against gravity which helps plants and trees get water
500
Where can the protons, neutrons, and electrons be found in an atom?
The protons and neutrons are in the nucleus at the center of the atom and the electrons surround the nucleus in the electron cloud
500
Name the macromolecule provides an immediate source of energy?
Carbohydrates
500
What are the 4 cell features that prokaryotes and eukaryotes share?
DNA, ribosomes, cell membrane, and cytoplasm
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