Correct question:
Which of the following definitions is INCORRECT?
A. pandemic: a disease that affects a large number of people in the world in a short time
B. epidemic: a disease that is endemic across the world
C. endemic: a disease that is constantly present in a population
D. incidence: number of new cases of a disease
Answer:
B. epidemic: a disease that is endemic across the world
Explanation:
A disease or infection is categorized as an epidemic when it affects a relatively large number of members of a population or locality. The spread of epidemic diseases is usually associated with specific conditions such as entry of a new pathogen in the population, contaminated food or water supply, etc. For example, the supply of contaminated water may affect a large number of individuals present in that locality with cholera. In this case, cholera will be an epidemic.
Answer:
2H₂O₂ → 2H₂O + O₂
Explanation:
Chemical equation:
H₂O₂ → H₂O + O₂
Balanced chemical equation:
2H₂O₂ → 2H₂O + O₂
Two mole of hydrogen peroxide split to gives two mole of water and one mole of oxygen.
Steps to balance:
H₂O₂ → H₂O + O₂
H = 2 H = 2
O = 2 O = 3
Second step:
2H₂O₂ → H₂O + O₂
H = 4 H = 2
O = 4 O = 3
3rd step:
2H₂O₂ → 2H₂O + O₂
H = 4 H = 2
O = 4 O = 4
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Answer:
d
Explanation:
During prophase, the chromosomes condense and centrosomes move to opposite sides of the nucleus, initiating formation of the mitotic spindle.
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