unit 1
Which statement correctly defines the term scientific theory?
an explanation for observable phenomena
What are the basic structural units of all living organisms?
cells
Which set of statements about genes in eukaryotic cells is correct?
Genes usually consist of two alleles. Each allele is located on a different chromosome.
Which statement about life on Earth is correct?
Flowering plants appeared later than conifers.
Which statement explains what happens when a plant cannot maintain homeostasis?
Its cells will increase function, but 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 is a key point of cell theory?
Cells are the basic structural unit of all living organisms.
Which statement defines proteins?
machine-like molecules that can carry out specific functions in a cell
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.
Which practices add to scientific knowledge?
inferring, predicting, drawing conclusions
Which option identifies the theory that describes cells and how they operate?
cell theory
Which statement defines alleles?
One of the two copies of genetic code that form a gene.
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.