Each member of a class sampled a piece of PTC testing paper. Thirty people sampled the chemical.

Twenty persons were tasters. How many had heterozygous genes?

10

20

0-20

indeterminate

Which of the following is a result of rotation of earth? A. Air temperature b. winds blow in to the beach off the water during the day c. The jet stream moves from west to East in North America d. Winds speed up when they move through the valley?

Characteristice of nestling flower plants

Do plants such as ferns need to break down glucose to obtain usable energy A. No, they absorb the sun's energy directly. B. No, they absorb energy from the soil. C. Yes, they make glucose and break it down to produce ATP. D.

Why is the discovery of multipotent cells valuable? A. because multipotent cells have the ability to specialize and heal greatly damaged tissue B. because multipotent cells can be harnessed to produce hormones for commercial production C.

Altering protein structure a. can alter its function. b. can be caused by heating the protein. c. can have serious medical consequences. d. all of the answers are true.

What are some examples and non examples of chemical bonding?

Match the staining techniques with their purpose. A Negative stain such as India ink or Congo red. B The Gram stain C The Ziehl-Neelsen Acid-fast stain D Simple stain with a basic dye E The Schaeffer-Fulton Endospore stain Stain microbes a bright

Sandy puts a paper clip on the table and puts a magnet near the paper clip. The paper clip begins to move. What type of forces are acting on the paper clip?

Which statement is an example of absolute age? 1) Dinosaurs lived a long time ago 2) Trilobites lives before dinosaurs 3) Teachers are old 4) Dinosaurs went extinct 65.5 million years ago

Identify the structure in the cell that will produce atp from the starch building blocks