Answer the following questions true (T) or false (F)
1. Binary fission is more complicated than mitosis.
2. Gram-positive bacteria stain purple when the Gram stain is complete.
3. Prokaryotic cells that move in response to oxygen levels are said to display chemotaxis.
1. FALSE
2. TRUE
3. FALSE
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Recent advances in molecular techniques allowed paleobiologists to sequence DNA that was preserved in a woolly
mammoth that died ____ years ago.
a. 27,000 b. 4,000 c. 2,700 d. 1,000 e. 500
What is the atomic mass number of an atom with 7 electrons, 7 neutrons, and 7 protons?
a. 7 daltons b. 10 daltons c. 14 daltons d. 21 daltons e. 28 daltons
A degenerative brain disorder transmitted by cannibalism is called ________
A) kuru B) scrapie C) Creutzfeldt-Jakob disease D) herpes
Which of the following are accurate descriptions of the properties of water? (select all that apply)
A. Water molecules are polar, and thus dissolve other polar or ionic substances. B. Water molecules are nonadhesive, tending to repel each other forcefully, resulting in a low surface tension. Water molecules are nonadhesive, tending to repel each other forcefully, resulting in a low surface tension. C. Water shrinks when it crystallizes, and ice is more dense than liquid water. D. Water's high heat of vaporization makes evaporation an effective way for many organisms to shed excess heat.