Ok at the schematic diagram of a simple self-replicating system. Such a system demonstrates that:
a. natural selection is occurring.
b. replication is occurring given specific substrates.
c. replication can occur independent of substrates.
d. variation can be induced in a system.
B
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In sanitary landfills, the primary safeguard against groundwater contamination is to:
a. do nothing as groundwater contamination is not a problem with landfills. b. line the landfill with impermeable clay and plastic. c. design the landfill to use the natural slope of the land so water runs downhill without being contaminated. d. locate landfills on industrial sites where groundwater is not used for drinking.
Which of the following is not a characteristic of an X-linked recessive disorder pedigree?
A. If a woman has the characteristic, all of her sons will have it. B. If a female has the trait, her father must also have it. C. An affected son can have normal parents. D. More females than males are affected. E. The characteristic often skips a generation.
A cytologist is examining a tissue under an electron microscope. He notices that the endoplasmic reticulum of each cell is extremely rough in appearance and he knows that the rough appearance is because of the ribosomes embedded there. He asks why there are so many ribosomes. You respond,
A. "This tissue exports various nucleic acids, hence the large number of ribosomes present on the endoplasmic reticulum in each of those cells." B. "This tissue exports lipids and is very involved with mRNA production." C. "This tissue exports proteins to other areas of the body."
The effectiveness of sound for communication is limited because only simple messages can be transmitted
Indicate whether the statement is true or false