Suppose you have a way to measure the amount of DNA in one cell during the cell cycle. You first measure the amount at the G1 phase. At what points in the rest of the cycle will you see a change in the amount of DNA per cell?
What will be an ideal response?
One way to measure the amount of DNA in the cell is to keep account of the number of DNA molecules at each point in the cell cycle. It would look like this for a human somatic cell: G1 (46); S (92); G2 (92); prophase (92); metaphase (92); anaphase (46 moving to each pole); telophase (46 each cell).
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Which of the following statements about behavior shaped by experience is not correct?
A. It typically involves a change in strength of neuronal connections. B. The central nervous system of even simple animals is capable of information processing. C. Animal nervous and endocrine systems and input of experience are integrated to generate adaptive behaviors. D. Experience shapes behaviors that include moving, navigating, and time keeping. E. Behaviors shaped by experience are primarily genetic and are inherited.
Viruses are composed of only
a. proteins. b. carbohydrates and proteins. c. proteins and nucleic acids. d. nucleic acids. e. carbohydrates, proteins, lipids, and nucleic acids.
Which of the following statements regarding leaf structure and function is not true?
a. Most photosynthesis takes place in the palisade mesophyll. b. Most stomata are usually found on the upper epidermis rather than the lower. c. The palisade mesophyll is more densely packed than the spongy mesophyll. d. A waxy cuticle covers the epidermis of many leaves. e. The epidermis of many leaves has associated trichomes.
Agriculture, industrial use, and domestic use are the largest uses of fresh water supplies, in that order.
a. true b. false