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
monitta
3 years ago
10

What is the most difficult part of a controlled experiment?

Biology
2 answers:
siniylev [52]3 years ago
8 0

Answer:

The correct answer is option 1.) "testing only one variable".

Explanation:

One of the basis of scientific experimentation is to test one variable at the time in order to make sure that the obtained results are a direct consequence of the variable of study. However, testing only one variable at the time is not an easy task. It is necessary to establish a negative control which only difference is the absence of the variable, and a positive control using a variable that the scientist know is going to produce a response.

Anna71 [15]3 years ago
4 0
1. Testing only one variable
A controlled variable means its the one that stays the same. In a controlled experiment, it means there is only one manipulated, (changed) variable. 
You might be interested in
Examples of different ways that observations can be used in scientific inquiry
stira [4]
<span>observations are used in scientific study when conducting experiments to see</span>
5 0
3 years ago
Two tomato plants are cross pollinated to produce tomato plants that produce more tomatoes.
garri49 [273]

Answer:

Genetic Engineering

Explanation:

Image result for Two tomato plants are cross pollinated to produce tomato plants that produce more tomatoes.

When tomatoes cross pollinate, the genetic material of the two tomato varieties will combine and the seeds will be hybridized. Cross pollination will not affect the fruit, only the seeds inside.

8 0
2 years ago
Read 2 more answers
Which type of clouds can you always expect to bring precipitation?
yawa3891 [41]
<span>Low Level Clouds: CUMULUS: Fair weather cumulus clouds form when a parcel of air rises and water vapor condenses into water droplets. ...Middle Level Clouds: ALTOSTRATUS: ...High Level Clouds: CIRRUS: ...<span>Nimbus Clouds: NIMBOSTRATUS:</span></span>
5 0
3 years ago
6. Adolescent females often require additional amounts of iron in their diet. Explain why.
Oxana [17]
Our blood contains a large proportion of the iron in our bodies. Because women lose blood during a period, they also lose iron. This means that they need more iron in their diet to counteract this.
6 0
2 years ago
Let's suppose you were interested in developing drugs to prevent epigenetic changes that may contribute to cancer. What cellular
Vaselesa [24]

Answer:

Potential targets:

1- DNA methyltransferases

2- Chromatin modifiers such as histone acetyltransferases, histone deacetylases, histone methyltransferases, etc.

3- Components of the RNA interference (RNAi) machinery such as Dicer, Argonaute, etc.

Explanation:

Epigenetics can be defined as the study of any heritable change in the phenotype that does not involve modifications in the DNA sequence. Epigenetic mechanisms can be classified into three major types: 1-DNA methylation, 2-histone modifications (e.g., acetylation, methylation, phosphorylation, etc), and 3-regulatory non-coding RNAs (e.g., miRNAs, lncRNAs, siRNAs, etc) that modulate target gene expression via the RNA interference pathway. There are different types of proteins that are involved in these complex epigenetic mechanisms, and those cited above represent only some examples that can be used as therapeutic targets.

5 0
3 years ago
Other questions:
  • About 1.2 billion years ago, eukaryotic and multicelled organisms evolved because _____. oxygen became available from cyanobacte
    11·1 answer
  • Compare and contrast type 1 and type 2 diabetes
    9·2 answers
  • Classification of living things takes into consideration all of the following except
    12·1 answer
  • what is the difference between single and a relationship? why people do like to be in a relationships?
    10·2 answers
  • Which of the following is true about radio waves?
    10·1 answer
  • Vaccinations were first used in what time period?
    11·2 answers
  • 5. Which of the following professionals has the authority to prescribe medication and treatment?
    15·2 answers
  • 3. Differentiate between variation and heritability
    10·1 answer
  • If a truck has a mass of 4,250Kg and has a velocity of 20m/s, and a car has a mass of 2,350Kg and a velocity of 24m/s, what is t
    11·1 answer
  • What is technology?
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!