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
marin [14]
2 years ago
7

. A researcher studies the evolutionary relationships between influenza viruses by comparing the genomic sequences of the viruse

s found in pigs, ducks, and humans in a given year. When evaluating the viruses that had infected these hosts the previous year, she identifies a cross-species transfer from humans to pigs. This information supports the hypothesis that cross-species transfer leads to more severe disease if during the previous year _______ suffered a severe influenza pandemic.
Biology
1 answer:
Rainbow [258]2 years ago
8 0

Answer:

pigs

Explanation:

Influenza is an infectious disease caused by influenza viruses, which can be divided into four types A, B, C and D. In humans, influenza A and B viruses are known to cause epidemics, while A viruses are known to cause pandemics. Influenza viruses are also found in birds and mammals (e.g., dogs, cats,  cattle pigs and horses). Cross-species virus transmission refers to the transmission process of infectious viruses between hosts from different species. Several viruses that may cause severe diseases in humans have originated from animal species, e.g., avian influenza A virus that can be transmitted to humans through an intermediate host (e.g., pigs). Other examples of cross-species virus transmission include the Ebola virus and Hantaviruses. It has been suggested that cross-species transmission is a common phenomenon in rapidly evolving viruses.

You might be interested in
Acetylcholine receptors on skeletal muscles are described as being ionotropic receptors because
DerKrebs [107]

Answer:

they are Na+, K+ and Ca2+ ion channels.

Explanation:

Ionotropic acetylcholine receptors are also called nicotinic acetylcholine receptors because beside acetylcholine (Ch) they respond to nicotine. These receptors are  primary receptors in muscle for motor nerve-muscle communication that controls muscle contraction.

Two molecules of ACh are required for receptor to open. Since the receptors are  linked to ion channels, the channels open. Opening of the channel allows positively charged ions to move across it: sodium enters the cell and potassium exits.

3 0
3 years ago
Some genes are important enough to be called "molecular switch" or "master" genes. What is the purpose of these genes?
trapecia [35]

Answer:

Genes called "molecular switch" or master genes have the purpose of control when other genes are expressed (option A).

Explanation:

Master gene is so named because it has the function of controlling the behavior of other genes, organizing their functions and regulating when they can be expressed.

The name of molecular switch is synonymous with the master gene, since its activation determines the genetic regulation necessary to establish cell differentiation and even the determination of the sex of some species.

The other options are not correct because:

<em>     B. Master genes do not </em><u><em>determine the organization of the genome</em></u><em> .</em>

<em>     C. </em><u><em>Regulation of cell metabolism</em></u><em> depends of substances as hormones and enzymes. </em>

<em>     D. </em><u><em>The rate of translation</em></u><em> does not depend on the activity of master genes.</em>

4 0
2 years ago
Which one is it ?!?
xeze [42]
White blood cell is the answer
6 0
3 years ago
Read 2 more answers
The innermost serous membrane covering the heart is the: Group of answer choices synovial layer peritoneum visceral pleura visce
stepan [7]

<u>Answer:</u>

<em>There are innermost serious membranes that cover the heart is Parietal Pericardium.</em>

<u>Explanation:</u>

Heart is <em>covered by pericardium</em> in two sides, inner and outer sides. The inner membrane is parietal pericardium and the outer one is visceral pericardium. Pericardium is made up of <em>fiber tissues</em> that strongly protect the heart from all around.

The<em> main function of pericardium</em> is to protect the heart from any injuries and prevent the infections. The serious pericardium helps in<em> lubricating the heart. </em>

3 0
2 years ago
At the end of meiosis 1 how many cells are there
GarryVolchara [31]
Meiosis produces four genetically different haploid cells.

7 0
3 years ago
Other questions:
  • Dna is comprised of smaller segments of genes that code for the production of a specific protein. the role of rna polymerase in
    13·1 answer
  • The purpose of the Human Genome Project was to
    9·1 answer
  • The best scientific theories not only explain and organize known facts but also __ __.
    8·2 answers
  • There are many differences among humans. However, all humans belong to the same species because they A. can communicate with one
    10·2 answers
  • Which of the following describes the muscles?
    11·1 answer
  • Help please! much appreciated
    10·1 answer
  • Environmental factors can influence natural selection because they can increase or decrease
    14·2 answers
  • Differences of sound waves and light waves GIVE ATLEAST TWO EXAMPLE ON EACH WAVES
    9·2 answers
  • You are trying to program E. coli bacteria to generate N-acylethanolamide, lipids that have been found to help suppress appetite
    8·1 answer
  • How does fertilization produce new offspring?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!