All of the following structures contribute to the ability of pathogenic bacteria to cause disease, except
A. outer membrane of gram-negative cell walls.
B. capsule.
C. inclusions.
D. fimbriae.
E. slime layer.
Answer: C
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In many _____, an extensive dikaryotic mycelium is the most conspicuous phase of the life cycle
a. chytrids c. sac fungi b. zygote fungi d. club fungi
Heterozygotes for the sickle-cell allele show higher fitness than either homozygote genotype in malarial regions. This is an example of
A) epistasis. B) pleiotropy. C) founder effect. D) overdominance. E) codominance.
Microfilaments:
A) help cells move or capture prey. B) act as "monorails" along which organelles move. C) form the structure of cilia and flagella. D) stabilize the position of the nucleus.
Oxygen is transported in blood most efficiently
A. by combining with hemoglobin. B. by being dissolved in the plasma. C. by chemical conversion to water. D. by combining with carbon dioxide to form bicarbonate ions. E. as a free oxygen ion or radical.