Which of the following may be a component of bacterial cell walls?
A) carrageenan
B) lipoteichoic acids
C) mycolic acid
D) tubulin
E) both lipoteichoic and mycolic acids
E
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Which organisms would be part of a grazing food chain but not a detrital food chain?
a. herbivores b. detritivores c. bacteria d. worms e. producers
Humans have ___ symmetry and are ___
a. radial--protostomes b. radial-deuterostomes c. bilateral--deuterostomes d. bilateral-protostomes e. biradial-deuterostomes
Because a direct count of all individuals within a population is often impossible, population density is usually estimated by one or more methods of ________
Fill in the blank(s) with correct word
A woman's doctor tells her to gargle with salt water. She stirs a tablespoon of salt into a cup of warm water, and watches it dissolve. Why does the salt dissolve in water?
a. The positive hydrogen atoms in water molecules are attracted to chlorine ions, and the negative oxygen atoms in water molecules are attracted to sodium ions. b. The negative oxygen atoms in water molecules are attracted to sodium ions. c. The positive hydrogen atoms in water molecules are attracted to chlorine ions. d. The positive hydrogen atoms in water molecules are attracted to sodium ions. e. The negative oxygen atoms in water molecules are attracted to chlorine ions.