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
yaroslaw [1]
3 years ago
12

A scientist discovered a new antibiotic and wanted to know if it would be effective against group A Streptococcus bacteria. He d

esigned a test experiment in a lab with ten different cultures of the bacteria. He introduced the antibiotic into five of the cultures, leaving the other five to grow without it. He recorded observations every three hours for a week.
What is the independent variable in this experiment?
A.
the presence of the new antibiotic
B.
the presence of the Streptococcus bacteria
C.
the total number of bacteria cultures
D.
the reaction of the bacteria to the antibiotic
Biology
2 answers:
stepladder [879]3 years ago
4 0
An experiment is a process where the a scientist tests and draws their evidence and data from. Hence, this process is where the hypothesis be supported or negated.

Variables are traits, factors, or characteristics that either manipulated or measured being the subject to become the data.
The independent variable is B. 
<span>the presence of the new antibiotic</span>
hoa [83]3 years ago
4 0

Answer:

the presence of the new antibiotic

Explanation:

I took the test

You might be interested in
True or False:
Oduvanchick [21]
True. such as with pesticides, they are used to reduce harmful insects to crops but they often re harmful to the health of people consuming those crops
4 0
3 years ago
How does the stem help in meeting the basic needs of a plant
sertanlavr [38]
The stem supports the plant and because of the stem the plant is able to grow taller if needed
4 0
3 years ago
What passageway in the spinal cord is continuous with the ventricles?
BlackZzzverrR [31]
It is the central canal.
4 0
4 years ago
Explain why plants do not burst when immersed in distilled water
Lesechka [4]

Answer:

it becames turgid

Explanation:

Plant cells have plasma membrane and rigid cellulose cell wall. When the cell is placed or immersed in distilled water, the water is absorbed by osmosis. As the cell becomes turgid, the cell wall creates an inward force i.e wall pressure that prevents the cell from bursting.

3 0
3 years ago
Read 2 more answers
Which of the following can genetic engineering cause?
Valentin [98]

Answer:

I believe it's D

Explanation:

I think its d because genetic engineering can cure genetic diseases

5 0
3 years ago
Other questions:
  • What are the steps in the experiment? (list four steps) How do the scientists test the hypothesis?​
    6·1 answer
  • Carbon chains are principal features of both carbohydrates and lipids.what is the primary difference between these two types of
    8·1 answer
  • The population size that an environment can sustain is called the
    5·1 answer
  • What are physical characteristics that help an organism survive
    12·1 answer
  • What is the name of the condition in which tissue from the lining of the uterus grows outside the uterus?
    8·2 answers
  • Urine produced in the kidneys is carried to the bladder through a pair of tubes called _____.Select one of the options below as
    15·1 answer
  • Many plants have a waxy cuticle to prevent them from losing water. This is made of
    11·2 answers
  • Dr. Brantz wants to use neuroimaging to detect which part of the brain is active when a person is lying. He asks half his partic
    5·1 answer
  • Apa pengertian devisa?
    12·2 answers
  • Jane conducted a simple experiment to see which soil would make her tomato plants grow the tallest. She planted two groups of to
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!