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
Schach [20]
3 years ago
6

A scientist isolates a microbe from a contaminated water source. She thinks that the organism might be a new bacteria that is ca

pable of surviving in the presence of lead, a heavy metal. She makes tubes of growth medium containing either no lead, 0.1 mg lead, 0.25 mg lead, 0.5 mg of lead or 1 mg of lead. She inoculates each tube with the 10 x 10e3 cells of the new organism and then incubates the inoculated medium at 37-degree Celsius. After 48 hours, she examines the tubes of medium and finds that there is no growth in any of them. However, she finds that the bacteria grew fine in a medium that did not contain any lead. She decides to repeat the experiment using lower concentrations of lead than those she used initially. what conclusion can the scientist in this scenario make from her result
1) all contaminated water contains high levels of lead and other heavy metals

2) the amount of lead used in the experiment killed the bacteria being tested

3) all experiment should be repeated three times or more

4) lead-contaminated water does not contain any bacteria at all

5) the test bacteria take more than 48 hours to grow in the laboratory when incubated at 37 degree Celsius
Biology
1 answer:
guajiro [1.7K]3 years ago
3 0

Answer:

2) the amount of lead used in the experiment killed the bacteria being tested

Explanation:

The bacterial colonies that women cultivate do not develop in media with these dimensions of lead.

It does not influence the number of hours or the temperature because if a group could proliferate and had the time necessary to develop the rest, it should also do so.

That is why the study should be repeated with lower lead identifications and be able to verify specifically if the hypothesis raised is correct: This group of bacteria does not grow in leaded media, either because lead has a bactericidal or bacteriostatic effect on these colonies.

You might be interested in
Which of the following forms of
Aleksandr [31]

Answer:

B. diffusion

Explanation:

Because diffusion is a passive process, it does not require energy expenditure by the cell.

7 0
3 years ago
Read 2 more answers
Red-green color blindness is an x-linked recessive trait in humans. Two people with normal color vision have a son with colorbli
irakobra [83]
Father: XY
Mother: XX’

The father is normal, while the mother is a carrier.
7 0
2 years ago
When animals feed off of land faster than the plants can regrow, the land is
e-lub [12.9K]

Answer:

Depleted

Explanation:

depleted- to decrease seriously or exhaust the abundance or supply of

6 0
3 years ago
Read 2 more answers
Why is a person with type AB blood able to receive a blood transfusion from a donor with any of the major blood types (A, B, AB,
Alisiya [41]

Answer:

ABO blood grouping system is based on presence or absence of three types of antigen on red blood cells. A and B blood group have A and B antigens respectively. AB blood group has both A and B antigens. O blood group does not have any antigen.

A body with particular blood type will consider other blood group foreign ( because it has different antigen ) and produce antibodies against it. A person with blood type A can not be given B type blood because the antibodies in his body will destroy RBCs with B antigen which may even prove fatal.

AB blood type person can receive blood from both A and B blood groups because he has antigens for both of them so it will produce antibodies for neither of them. He can also receive O type blood because O blood does not have any antigen so it can be given to any person without incompatibility reaction.  

However, AB individual can only donate blood to AB individual because his blood cells have both A and B antigens. So, he can only donate blood to an individual who does not produce antibodies for both A and B blood groups and that would only be another AB blood type individual.

3 0
3 years ago
If a chromosome comes apart because it is not well attached at the center, 1 point
UkoKoshka [18]

Answer: The most problem is likely with chromatin

Explanation:

6 0
3 years ago
Other questions:
  • Which of the following best describe the shape of a neuron?
    14·1 answer
  • If you place flaccid plant cells in pure water, water ________ into cell because it has ________.
    15·1 answer
  • How do viruses reproduce?
    12·2 answers
  • _____ better mirrors the mitosis process.<br> Meiosis I<br> Meiosis II
    6·2 answers
  • Which biome is characterized by permafrost
    14·2 answers
  • In "The Most Dangerous Game" by Richard Connell, General Zaroff says the following:
    14·2 answers
  • PLEASE HELP ME ON QUESTION 10 ASAP!!!!!! GIVING 20 POINTS!!!!!!!!!!!!!!!!!!
    8·1 answer
  • In humans blood type is determined by the A B, and O alleles. The A and B alleles are codominant to each other and dominant over
    15·1 answer
  • ( pls help lol ty ) { 30 points } [brainliest]
    15·2 answers
  • What are California's major mineral resources
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!