CER
CER Stands for:
Claim, Evidence, Reasoning
A sunflower turns toward the sunlight throughout the day. Which characteristic of life does this demonstrate?
Response to stimuli/environment
What is water made of?
2 Hydrogen atoms, 1 oxygen atom
(H2O)
Which elements will be found in all macromolcules? (Write them out fully!)
Carbon, hydrogen, oxygen
Which property of water allows it to stick to other substances?
Adhesion
What is the purpose of a claim?
To answer a scientific question.
A rock grows larger as layers of sediment collect on its surface. Is this a characteristic of life?
No, the rock is non-living! This is not a sign of growth/development
Which type of bond forms between different water molecules?
Hydrogen bonds
Which macromolecule can provide a quick source of energy?
Carbohydrates
If a molecule is composed of amino acids, then it is:
A protein
Make a claim for the following evidence: Two identical plants were given different amounts of water. Plant A received 100 mL of water each day and grew 12cm. Plant B received 25 mL of water each day and grew only 5 cm.
Plants that receive more water grow taller than plants that receive less water.
A tadpole gradually develops legs, loses its tail, and transforms into an adult frog. Which characteristic of life does this demonstrate?
Growth & development
A student places water & sand under a heat lamp. After 15 minutes, the sand is significantly warmer. What does this suggest about the specific heat of sand compared to water.
Sand has a lower specific heat capacity that water, so its temperature increases more quickly than water would, even under the same conditions.
How do monosaccharides and polysaccharides differ?
Monosaccharides contain one sugar, while polysaccharides have many repeating monomers.
A bear builds up fat reserves before hibernation. Which macromolecule allows the bear to store energy for long periods?
Lipids
A student writes, "The ice melted faster because heat causes ice to change from a solid to a liquid." Is this claim, evidence, or reasoning?
Reasoning
A population of insects develop resistance to a pesticide over many generations. The surviving insects produce more offspring, and pass their resistance traits to their offspring.
Identify three characteristics of life.
Adapt/Evolve
Reproduction
Genetic Info/DNA
A student places a celery stalk in colored water. Several hours later, the colored water has moved upward through the stalk. What three properties contribute?
Cohesion, adhesion, and capillary action
Provide one example for a carbohydrate. (not foods or types!)
Glucose, cellulose, chitin, sucrose, etc.
A student wants to determine whether listening to music affects memory. They ask two groups of students to memorize the same list of 20 words for five minutes.
Group A: Studies in silence and remembers an average of 17 words.
Group B: studies while listening to music with lyrics, and remembers an average of 11 words.
What would be a good reasoning to support the claim that "Students memorize information better in silence than with music." Using the evidence provided.
Lyrics may distract students, making it harder for their brains to focus on remembering the words.
A student notices that they sweat more when running outside than when sitting in their classroom. Explain the scientific reasoning.
Running increases body temperature, so the body produces more sweat to help cool them down.
A population of fish live in a lake that gradually becomes colder over many generations. Fish with traits that help them survive colder temperatures become more common. Explain how this would best represent adapt & evolve, not homeostasis.
Evolution involves in traits being passed down from generation to generation to help with survival.
Homeostasis helps individual organisms to maintain stable internal conditions.
A student notices that a drop of water spreads across clean glass, but forms a rounded droplet on a waxed surface. What property best explains the difference between the glass and wax paper?
Polarity!
The glass surface is hydrophilic, or polar, which is why it spreads out. The wax paper is hydrophobic, or non-polar, so water molecules attract through cohesion to form rounded droplets.
Match the monomer or common part to their macromolecule:
Fatty acid & glycerol
Nucleotides
Amino acids
Monosaccharides
Fatty acid & glycerol - Lipids
Nucleotides - Nucleic Acids
Amino acids - Proteins
Monosaccharides - Carbohydrates
List all 8 characteristics of life.
Organization, response, reproduction, use/maintain energy, growth/development, genetic info/DNA, adapt/evolve, regulation/homeostasis