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Chapter 22: Q 21. (page 571)

A disease that is constantly present in a population is called _____.

a. pandemic
b. epidemic
c. endemic
d. re-emerging

Short Answer

Expert verified

The correct answer is an option (c) endemic.

Step by step solution

01

Introduction

Disease

A disease is a disorder that causes cells, tissues, and organs to stop working normally.

Epidemiological Classification of disease

This classification pertains to the disease's frequency, distribution, and control in a population. For example - Covid 19 is a pandemic disease.

02

Explanation

The correct option is (c).

The explanation for the correct option

In a population, the endemic disease is one that is constantly present, but at a low rate.

The explanation for incorrect options

Option a - A pandemic is a worldwide epidemic that affects multiple countries and continents. Example - Influenza

Option b -An epidemic is a disease that affects an exceptionally large number of people at the same time in a population.Example - Smallpox

Option d - Diseases that resurface after a long period of decrease are known as re-emerging diseases. Example - Malaria

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Most popular questions from this chapter

Which of the following statements about the nitrogen cycle is false?

a. Nitrogen fixing bacteria exist on the root nodules of legumes and in the soil. b. Denitrifying bacteria convert nitrates (NO3 - ) into nitrogen gas (N2 ).

c. Ammonification is the process by which ammonium ion (NH4 + ) is released from decomposing organic compounds.

d. Nitrification is the process by which nitrites (NO2 - ) are converted to ammonium ion (NH4 + ).

Synthetic compounds found in an organism but not normally produced or expected to be present in that organism are called _____.

a. pesticides
b. bioremediators
c. recalcitrant compounds

d. xenobiotics

Cyanobacteria harness energy from the sun through photosynthesis, and oxidize water to provide electrons for energy generation. Thus, we classify cyanobacteria as _________.

a. photolithotrophs

b. photoautotrophs

c. chemolithoautotrophs

d. chemo-organotrophs

A new bacterial species is discovered and classified as an endolith, an extremophile that lives inside rock. If the bacteria were discovered in the permafrost of Antarctica, describe two extremophile features the bacteria must possess.

Imagine a region of soil became contaminated, killing bacteria that decompose dead plants and animals. How would this effect the carbon cycle in the area? Be specific in stating where carbon would accumulate in the cycle.
See all solutions

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