Unit 1
Which statement correctly defines the term scientific theory?
An explanation for observable phenomena.
Which option describes where the energy input required for photosynthesis comes from?
Sunlight
Which option correctly defines gene?
A section of DNA that affects traits
How are the ages of extinct organisms determined?
By studying the concentration of radioactive atoms in their fossils.
Which statement explains what happens when a plant cannot maintain homeostasis?
Its cells will decrease function, and it will eventually die.
Which option describes a similarity between scientific laws and scientific theories?
Both can change in light of new evidence.
Which option correctly explains why plants perform photosynthesis?
To transform solar energy into chemical energy.
Which statement about genes, DNA, and chromosomes is correct?
DNA is a molecule that makes up chromosomes; genes are sections of DNA.
Which statement about organisms in the fossil record is correct?
Life originated in the oceans.
Which statement is correct about a dead cell?
A dead cell cannot maintain its homeostasis. It decomposes over time.
Which practices add to scientific knowledge?
Inferring, Predicting, Drawing Conclusions.
Which option correctly identifies what happens when a cell runs out of energy?
All life activities slow down. The cell eventually dies.
Which statement defines alleles?
One of the two copies of genetic code that form a gene.
Which statement is an assumption used in the relative dating of rocks?
The sediment that the rock is taken from is not disturbed by a geological event.
Why do plants close the pores in their leaves in response to a water shortage in the soil?
Closing the pores reduces water loss.