Unit 1
Having multiple independent variables increases the changes of having a better experiment because I will have more results.
False
Examine the list of organisms.
Which option correctly describes a similarity between the organisms?
They are all living organisms made of one or more cells.
Which option describes how genes control the traits of a cell?
Genes code for specific structures and molecules in a cell. Those structures and molecules form the traits of the cell.
Which option describes how the absolute age of a fossil is commonly determined?
The carbon-14 in a fossil breaks down over time. The remaining amount of carbon-14 in the fossil can be used to calculate its age.
Read the statements.
Some baby birds peck at a red dot under their parent’s beak. This triggers a gagging reflex in the parent.
Which option describes how this behavior increases fitness?
The parent regurgitates the partly digested food for the baby bird. The baby bird can eat this food.
ordan wants to know if temperature affect student test scores. Jordan will have a sample of 10 students. 5 students are places in a room where the temperature is 27 degrees Celsius. The other 5 students are placed in a room where the temperature is 15 degrees Celsius. Jordan gives chocolate to one group and not the other.
What is the dependent variable in Jordan's experiment?
Student test scores
Read the scenario.
A group of students is working on an experiment about cells. They heat some bacterial cells in an oven until all the cells die. The dead cells are then placed in a petri dish with nutrient molecules that are needed by cells to grow. The dish is kept at room temperature.
Which option correctly describes what will happen next?
No new bacterial cells will form.
Read the statements.
If Sally has earlobes that are attached to the side of her head. Sally has two _[blank 1]_ that cause her to have attached earlobes. Sally has obtained these from her _[blank 2]_.
Which option correctly completes these statements?
blank 1: alleles
blank 2: parents
Which statement describes Hutton and Lyell’s work?
Both Hutton and Lyell claimed that Earth was very old and changed very slowly over time.
Read the statements.
_[Blank 1]_ are known at birth. _[blank 2]_ are learned later in life.
Which option correctly completes these statements?
Match the word with the definition/example.
Amount of daylight
Independent Variable
Dependent Variable
Hypothesis
Independent Variable
Which options identify a key point of cell theory?
(Select all that apply.)
Living things are made of one or more cells.
Cells carry out functions that maintain life.
Read the statements.
In eukaryotic organisms, genes usually consist of two alleles. The two alleles are often on different parts of the same chromosome.
These sentences contain incorrect information. Which option describes the mistake?
In eukaryotic organisms, the two alleles of the gene are on different chromosomes.
Which statements are observations that Darwin made on his voyage?
Which option describes why some bird species migrate?
Some birds migrate to avoid harsh winter and summer conditions. By migrating, birds can be in regions that experience mild winters and mild summers.