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
Arisa [49]
3 years ago
13

In the 18th century, Carolus Linnaeus classified organisms based on their structural similarities. Modern classification determi

nes relationships more accurately because it is based on genetic and other biochemical similarities. This change in classification method best illustrates that____________.(1) multiple trials are required to increase thevalidity of a scientific explanation(2) scientific explanations are subject to theethical view of the scientist proposing them(3) peer review is required to validate the resultsof scientific investigations(4) all scientific explanations are tentative andsubject to change and improvement
Biology
1 answer:
Serggg [28]3 years ago
3 0

Answer:

(4) all scientific explanations are tentative and subject to change and improvement

Explanation:

<em>As new facts or findings emerge about a topic, previous explanations about the topic change or are improved on. That is why findings from researches do not become a theory overnight until they have been tested by several independent researchers.</em>

Even when findings become theories, emergence of overwhelming counterclaims concerning the findings often result in change of the theory. A good example is found in Dalton's atomic theory which claimed that atoms are the smallest indivisible particle of elements. The theory was later disproved by the emergence of the fact that atoms contain proton, neutrons and electrons.

Hence, it is concluded that all scientific explanations are tentative and subject to change and improvement as new facts emerge.

You might be interested in
reasoning from isolated observations to general principles is called _________. _________ means using general principles to make
scZoUnD [109]

Answer:

First Line: Induction

Second Line: Deduction

5 0
3 years ago
It is sometimes observed that offspring do not resemble their parents for a particular character, even though the character vari
Yuki888 [10]

Answer:

Explained below

Explanation:

Sometimes offspring do not resembles their parents because of variation, so these character varies in population. When Darwin went to Galapagos Islands, he observed an amazing diversity of characters. He realized that there were many varieties of finches in the same island. He collected two sets of parent offspring data in two different years. Most of the parents who captured before their beak depth were known then he captured offspring with fledged and measured their beak depth. He calculated average beak depth of two parents and then compared with offspring beak depth.

8 0
3 years ago
Explain the evolutionary relationship between the fin of a fish and the flipper of a whale.
Luda [366]

Answer:

The presence of fins in both species represents an adaptation to the same environment (i.e., sea), but in no way does this adaptation means close evolutionary homology between fishes and mammal cetaceans (whales)

6 0
3 years ago
Read 2 more answers
A DNA fragment is introduced into the lacZ gene of a plasmid, which also contains an ampicillin resistance gene. What is the app
zhenek [66]

Answer: The bacteria transformed with this particular plasmid will form white colonies on the plates containing ampicillin and Xgal.

Explanation: The lacZ gene produces an enzyme called β-galactosidase which is responsible for the breakdown of lactose into glucose and galactose. The lacZ gene is one of the three genes (the other two being lacA and lacY) of the lac operon which is responsible for the transport and mechanism of lactose in E. coli and many other bacteria.

In recombinant DNA technology, when a plasmid is to be used to transform a host cell, such markers are used to help screen the transformed cells from the ones that have not taken up the plasmid. Xgal present in the plates is an artificial substrate which is hydrolyzed by

β-galactosidase into 5-bromo-4-chloro-indoxyl which will dimerize and oxidise into 5,5'-dibromo-4,4'dichloro-indigo. This is a blue pigment which will give blue color to the bacterial cells. Introducing a DNA fragment in this lacZ gene will make it non-functional so it will not be able to produce the enzyme.

Therefore, when a bacterial cell is transformed with a plasmid containing ampicillin resistance gene and a DNA fragment introduced in the lacZ gene and then grown on plates containing ampicillin and Xgal, white colored colonies will appear. The white colonies will show the bacterial cells that have successfully taken up the plasmid with the DNA fragment incorporated in the lacZ gene as this will render the gene non-functional and will not produce β-galactosidase which will breakdown Xgal to give blue colonies. Since the plates contain ampicillin, only the bacterial cells that have been successfully transformed with the plasmid ( the ones that have the DNA fragment and the ones without it) will grow as the ampicillin resistance will give them resistance against ampicillin in the plates. The bacterial cells that have not taken up the plasmid will not be resistant to ampicillin and will not form colonies on the plate.

This is called blue-white screening which is used to identify successfully transformed host cells. A picture of this is given in the attachment, taken from the following website:

https://www.mun.ca/biology/scarr/Blue_&_White_Colonies.html

8 0
3 years ago
How does energy flow in a food chain or web? What happens as it moves up in trophic levels
dmitriy555 [2]

As energy moves through trophic levels in an ecosystem the amount that is available decreases. ... A: Energy flows in a food web by being transferred to and between organisms as they undergo photosynthesis, are consumed by another organism, or decompose.

7 0
3 years ago
Other questions:
  • What kingdom does this most likely belong in?
    6·1 answer
  • What are the Significance Of Helicase Enzymes During DNA replication?
    15·1 answer
  • Select all that apply. Which of the following were developed during World War II?
    9·2 answers
  • How is a tissue different from an organ? How are they similar?
    10·1 answer
  • When solving an equation using Boyle's law, which of the following steps do not apply? List your knowns and unknowns. Plug the k
    10·1 answer
  • Olfactory sensory neurons are short-lived and, therefore, replaced frequently. how does this turnover happen?
    7·1 answer
  • Theory of macroeconomics dominated the Reagan administration.
    7·2 answers
  • What term describes the form of a gene that produces a specific trait such as eye color?
    9·1 answer
  • Which parts of the flower will become the seeds and which part will become the fruit
    11·1 answer
  • Scientists use the scientific process to which mechanisms underlie observations; they do not if a particular finding is correct
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!