Water has unique properties which include its strength as a solvent; its three environmental stages of solid, liquid, and gas; and its temperature regulation. These properties are due to polar covalent bonds between oxygen and hydrogen. The polar covalent bonds are a result of
A. there being a greater number of electrons in oxygen outermost shell than in hydrogen.
B. oxygen being more electronegative and therefore attracting more electrons than hydrogen.
C. hydrogen being an electron donor and oxygen being an electron acceptor.
D. hydrogen and oxygen having equal electronegative strength and therefore have equal sharing of electrons.
E. hydrogen being more electronegative and therefore attracting more electrons than oxygen.
B. oxygen being more electronegative and therefore attracting more electrons than hydrogen.
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A molecule or anything else that transports new genes into a cell is called a
a. vector. b. plasmid. c. restriction enzyme. d. bacterium.
Which of the following statements describes the correct flow of energy conversions through living systems?
A. Chloroplasts produce carbon dioxide and water during photosynthesis, which in turn is used by mitochondria to generate ATP molecules. B. Mitochondria convert solar energy into the chemical energy of nutrient molecules such as glucose. Chloroplasts then burn glucose into ATP molecules during cellular respiration. C. Chloroplasts generate chemical energy in the form of ATP molecules and mitochondria convert ATP molecules into glucose to be used for work. D. Chloroplasts convert solar energy to the chemical energy of nutrient molecules and mitochondria convert this chemical energy into ATP molecules used for work. E. Mitochondria capture solar energy and convert it to oxygen. Oxygen is used by chloroplasts to generate ATP molecules.
The removal of all life forms from inanimate objects is termed ________.
A. sterilization B. disinfection C. degerming D. decontamination E. antisepsis
A scientist wants to magnify a pollen grain 8,000 times and examine the ridges and pores on its surface. Which of the following instruments would be best?
A) a transmission electron microscope B) a scanning electron microscope C) a fluorescence microscope D) a light microscope