What is the major differences between the cell walls of gram-positive and gram-negative bacteria?
A. the peptidoglycan layer in gram-positive bacteria is substantially thicker
B. the cell wall of gram-postive bacteria contains mycolic acids
C. gram-positive bacteria contain a cytoplasmic membrane
D. gram-positive bacteria may have a polysaccharide capsule as a covering
Ans: A. the peptidoglycan layer in gram-positive bacteria is substantially thicker
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Compound B is a ____________________.
Assume that you are taking an organic chemistry class. Your teacher has given you four organic compounds to analyze. She tells you that one is a carbohydrate, one is a hydrocarbon, one is a nucleic acid, and one is a protein. You discover that Compound B contains only carbon, hydrogen, and oxygen. Of the four types of compounds which were given to you to analyze, which one best describes Compound B?
A motor neuron and the muscle cells it synapses with form a(n)
a. active site. b. action potential. c. motor unit. d. cross bridge. e. motor network.
Mechanoreceptors are not evenly spaced on your body. What is an advantage of having mechanoreceptors located farther apart?
A) allows often used parts of the human body to feel pressure more severely than areas where mechanoreceptors are closer together B) allows often used parts of the human body to feel pressure less severely than areas where mechanoreceptors are closer together C) allows for greater dendrite regeneration after the body has experienced excessive pressure D) allows for a thicker epidermis than in areas where mechanoreceptors are closer together
Which of the following statements concerning conjugation pili is FALSE?
A) Pili are longer than fimbriae and flagella. B) Pili facilitate the transfer of DNA among bacterial cells. C) Pili are long, hollow tubules. D) Not all bacteria have pili. E) A bacterial cell will usually have only one or two pili.