A student is examining an onion root tip cell under a microscope. Based on her observations, the student proposes that the onion root tip cell has completed interphase and is now in the first phase of mitosis. Which of the following pieces of evidence would best support the student’s claim?
Choose 1
Choose 1

(Choice A)
A
The cell’s DNA is dispersed within the nucleus as chromatin.

(Choice B)
B
Separated sister chromatids are being pulled towards opposite ends of the cell.

(Choice C)
C
The cell’s chromosomes are aligned across the metaphase plate.

(Choice D)
D
Discrete chromosomes are scattered throughout the cell’s nucleus.

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Can you receive a shock severe enough to prevent you from releasing the wire from an ordinary outlet with dry hands?

Check all that occur during ventricular systole. a. the av valves open to allow blood to enter the ventricles from the atria. b. the av valves open to allow blood to enter the ventricles from the atria. c. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. d. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. e. the semilunar valves open to allow blood to flow into the large arteries. f. the semilunar valves open to allow blood to flow into the large arteries. g. the av valves close to prevent backflow of blood into the atria.