1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Dima020 [189]
3 years ago
12

Residents of three villages with three different types of water supply were asked to participate in a study to identify individu

als who were cholera carriers. Because there had been several recent deaths due to cholera, almost everyone participated in the study and underwent examination and testing. The proportion of residents in each village who were carriers was computed and compared. What is the proper classification for this study?
a. Cross-sectional studyb. Case-control studyc. Prospective cohort studyd. Retrospective cohort studye. Experimental study
Biology
1 answer:
Alexus [3.1K]3 years ago
5 0

Answer:

The correct answer is option a. "Cross-sectional study".

Explanation:

A cross-sectional study is a type of observational study used in medical and social researches. Cross-sectional studies are characterized by the analysis of data that comes from a population at a specific point of time. A research that involves studying the incidence of cholera carriers at three different villages with three different types of water supply, is an example of a cross-sectional study.

You might be interested in
Ou determine that a victim is unresponsive but breathing. while waiting with the victim for ems personnel, you would position th
nadezda [96]
You place them face up
7 0
3 years ago
Boris Magasanik collected data on the proportion of each base in RNA from different species. To compare the relative amount of e
just olya [345]

Answer:

The nucleic acid is a macromolecule present in living systems in the form of either DNA or RNA, whose molecule consists of many nucleotides which are linked with each other to form long chains. The presence of DNA or RNA in an individual promotes continuity of life. The variability and complexity of nucleic acid are dependent on its constituent molecules as, sugar, a phosphate group, and a nitrogenous base. However, two monocyclic nitrogenous bases were classified purines (adenine:A, guanine:G) and pyrimidines (thymine:T, cytosine:C, and uracil:U).

In addition, RNA is a single-stranded structure which differs from DNA in two aspects, the sugar content of RNA is ribose, and pyrimidine base uracil replaces the thymine base of DNA. A ratio between two strands of DNA can be calculated by using Chargrff's rule which states that "DNA from any cell of all organisms possess a 1:1 ratio (base Pair Rule) of pyrimidine and purine bases'.

The purine to pyrimidine ratio in RNA with different bases is given below in the following table:

Presence of single strand in RNA does not follow chargaff's rule and alters the purine: pyrimidine ratio. The above ratio of each base in the given information is not equal, due to which the ratio of purines to pyrimidines is different. The ratio of DNA and RNA is not equal because DNA has its complementary DNA strand. However, bases in RNA might vary due to its single-strandedness property, but its ratio is dependent on the species.

Therefore, it can be concluded that the ratio of purines to pyrimidines is dependent on the species due to its genetic makeup. Hence, option (c) is correct.

7 0
3 years ago
Explain two ways natural hazards can decrease the
Rzqust [24]

Answer:

When the natural resources Exhausted

6 0
3 years ago
What conclusions can be drawn about the greater
svet-max [94.6K]

The number of sunflower sprouts will be higher than birch tree sprouts because sunflower sprouts have a higher growth rate than birch tree sprouts.

<h3>What is the growth rate?</h3>

Growth rate refers to the ratio of development of a given population and/or biological structure.

The growth rate may result very useful in ecology studies as above mentioned (ecological succession).

In conclusion, the number of sunflower sprouts will be higher than birch tree sprouts because sunflower sprouts have a higher growth rate than birch tree sprouts.

Learn more about the growth rate here:

brainly.com/question/1078756

#SPJ1

4 0
2 years ago
Natural selection would favor which of the these rabbits in Antarctica? A) brown rabbit B) white rabbit C) black rabbit D) white
krok68 [10]
B cause they all blend in with snow so they can survive
5 0
3 years ago
Read 2 more answers
Other questions:
  • Which of the following describes an object with elastic potential energy?
    8·2 answers
  • name the four ways that a neurotransmitter leaves the synapse after being release by a pre-synaptic cell?
    5·1 answer
  • Describe Arctic Tundra
    6·2 answers
  • True or false, heart muscle can depolarize spontaneously in the absence of any external stimulation
    9·2 answers
  • The first recorded history of them dates back to 1549 when the Spanish were exploring the area.
    6·1 answer
  • What does the cardiovascular system do?
    11·2 answers
  • Elastic fibers are important to muscle tissue since they resist excessive stretching and help muscle fibers spring back to its o
    11·1 answer
  • where do all cells come from and how do they reproduce? explain in an easy way please I have trouble understanding
    8·2 answers
  • 4. A paper mill clears an area of deciduous and coniferous trees. A small pond forms on the newly cleared land as
    9·1 answer
  • Five hundred cockroaches of one species were sprayed with a new insecticide. Twenty-four hours later nearly all the cockroaches
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!