Which of the following is normal oral and nasopharyngeal flora but is involved in infective endocarditis in adults who have underlying congenital or rheumatic heart disease?
What will be an ideal response?
Haemophilus aphrophilus.
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An enzyme that cleaves internal phosphodiester bonds of a DNA molecule is a (n)
A. ligase. B. exonuclease. C. methylase. D. endonuclease.
Describe the colonial theory of animal origins
What will be an ideal response?
What is the advantage of a closed circulatory system over an open one?
A) A closed system carries more blood. B) In a closed system, the blood comes nearer to each cell. C) Blood flows more slowly in a closed system. D) There are more blood cells in a closed system. E) A closed system moves blood more efficiently.
Which of the following are characteristics of biomes? Check all that apply.
A. The climate and geography of a region determines what type of biome can exist in that region. B. Each biome consists of only one type of ecosystem. C. Biomes are only located at certain longitudes and latitudes. D. Temperate evergreen forest is one of the major biomes. E. A biome is a large geographical area with distinctive plant and animal groups.