Unit 2
An unknown 'thing' was observed moving, shrinking when exposed to light, breathing, getting larger over time, and making identical copies of itself. What are two characteristics of life observed here?
Responding to stimuli
Growing
Reproducing
A student wants to test how different amounts of sunlight affect plant growth. What is the independent variable?
The amount of sunlight the plants receive
Qualitative or Quantitative? : The foam rose by 20ml.
Quantitative
Be the first group to stand up and shout "Hooray!"!
Hooray! :)
Draw an example of a nucleotide and label each component.
Should have a phosphate connected to a sugar, connected to a base.
Put these items in order from smallest to largest according to hierarchy: 1) forest preserve 2) digestive system 3) robin 4) deer, plants and birds 5) flock of robins
digestive system --> robin --> flock of robins --> deer, plants and birds --> forest preserve
A scientist tests if music affects how fast hamsters run on a wheel. What should the scientist measure as the dependent variable?
Speed of hamsters
What goes in the "if" part of a hypothesis?
The IV
Students test if the type of liquid (water, soda, juice) affects how fast seeds germinate. What should they keep constant?
Amount of liquid given, location of seeds, sunlight on seeds, etc
How does tRNA play a role in protein synthesis?
tRNA brings amino acids during translation
What are two differences between passive and active transport?
Passive does not need energy while active does and passive transport moves things down their concentration gradient while active moves them up it
Students test if the type of liquid (water, soda, juice) affects how fast seeds germinate. What is the IV?
The type of liquid
What goes in the "then" part of a hypothesis?
The DV
A group of students gathers their materials for the lab and notes they have 40 ml of blue solution and 2 white tablets. Is this an observation of Exerpimental DESIGN or is it DATA?
Design!
A tRNA molecule has an anticodon of CAU. Which amino acid would it carry over to the ribosome?
Valine
What are the monomers/subunits of proteins, carbohydrates and lipids?
Proteins = amino acids
Carbs = monosaccharides
Lipids = glycerol and fatty acids
A teacher sets up two fish tanks: one with fertilizer added and one without. Give a possible hypothesis for this experiment.
If _________, then __________. (answers vary)
A group of students tested a red lightbulb on the effectiveness of photosynthesis on a plant. They placed a second plant under full sunlight. What is the control group?
Plant under sunlight
A group of students is observing pillbugs in a choice chamber. As the experiment progresses they count 10 pillbugs on the side of the chamber with the disco light in it. Is this an observation of experimental DESIGN or is it DATA?
Data!
How do B cells and Killer T cells help your immune system work properly?
B cells make antibodies
Killer T cells destroy infected body cells
Draw an example of a cell in a beaker of water where the water would move into the cell.
Your cell should have a lower water concentration than the beaker does.
A Maine South Cross Country member is testing out a new pair of shoes to see if it lowers her race time at the next meet. What is the DV?
A pharamicist set up a study to determine whether Vitamin C could reduce cold symptoms. 10 volunteers were split into two equal groups. For two weeks, members of Group 1 took 1 tablet of the Vitamin C. Group 2 took a placebo (a sugar pill that does not contain the supplement). At the end of the two-week period, the pharmacist exposed the volunteers to germy preschoolers. The volunteers in both Group 1 and Group 2 continued to take their daily pills. All the volunteers developed symptoms of a cold, and there was no significant difference in the length of time the cold symptoms lasted. Make a claim about the Vitamin C.
The Vitamin C was ineffective in reducing cold symptoms.
Researchers are observing the effect of adding growth hormones to oak trees. What is one example of QUALITATIVE data and one example of QUANTITATIVE data they could collect?
Answers may vary!
Qualitative = descriptive
Quantitative = numerical