Johannes wants to know whether soil, water, or both are needed for plant growth. He chooses to conduct experiments on a willow tree for five years to answer his question. How can his experimental methods be changed to improve his experiment?

Identify the properties of heat as it relates to the molecules within a body

Select all answers that apply. To develop a molecular clock, you need to find which of the following? a sequence of molecules the rate at which changes occur in a type of molecule how much total change has occurred in a type of molecule from two

For DNA to be passed on to a later generation an organism must

What would happen if human sperm and eggs were produced by mitosis?

Define homologous structures and explain how these structures support evidence of common ancestry

True or False All algae have roots, stems, and leaves.

How would a houseplant respond to sunlight that comes from one direction? A. by curling its stem around its leaves B. by closing its leaves at night C. by growing roots downward through the soil D. by bending its stem toward the sun

Hershey and chase used a dna-based virus for their work. How might the results have been different if they had used an rna virus?

State the function of DNA

How are proteins involved in DNA replication?