Someone diagnosed with meningitis has inflamed membranes that cover and protect the brain and spinal cord. Meningitis is a result of pathogenic gram-negative bacteria that cause extreme infections when their bacterial cell wall dies and
lipopolysaccharide (a lipid and polysaccharide) is released. The lipopolysaccharide is an example of a(n)
A) endotoxin.
B) exotoxin.
C) stomach microbiota.
D) parasite.
Answer: A
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________ resist tensile forces and contain keratin to form the protective barrier of the skin.
A) Intermediate filaments B) Microtubules C) Microfilaments D) Actin filaments E) Keratin-associated filaments
What is a gene?
A. A section of DNA that codes for a portion of a protein B. A discrete sequence of DNA nucleotides C. A section of DNA that codes for one or more proteins D. All of these and more are part of the expanding definition of a gene.
How is it possible for living organisms to comply with the second law of thermodynamics?
A) Sunlight functions as an ultimate source of energy for most forms of life on Earth. B) Chemical reactions inside cells mostly cause an increase in high-level energy. C) Organisms are able to function efficiently on heat energy alone. D) Living organisms are unique in that they do not require energy for survival. E) Living organisms are totally isolated systems that are not subject to the laws of physics.
The organ that is responsible for secreting cocoons in the oligochaetes is known as the
A. radula. B. nephridia. C. clitellum. D. lophophore. E. setae.