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
A_________is a linear sequence in which energy is transferred from
loris [4]

Answer:

the answer is biosystems

Explanation:

that is what Google said lol

6 0
3 years ago
Two male deer will fight each other for the opportunity to mate with a female.
Paha777 [63]
If you’re trying to find what type of relationship these situations describe then the first one is “competition” and the second one is “predation”
4 0
3 years ago
Can changing diet reduce high blood pressure? Vegetarian diets and low-salt diets are both promising. Men with high blood pressu
valina [46]

Answer:

The correct answer is - 2 variable or factors,

1. normal or vegetarian diet, and

2. restricted or unrestricted diet.

Explanation:

The presented experiment is designed to see if the diet has a role in reducing high blood pressure. In this experiment two factors, a low salt diet and a vegetarian diet believed to have a promising effect.

Men with high blood pressure are assigned to random diets but these randoms diet has two common factors which are normal or vegetarian diet and restricted or unrestricted salt diet to check their individual effect on reducing high blood pressure.

Thus, the correct answer is -  2 variable or factors,

1. normal or vegetarian diet, and

2. restricted or unrestricted diet.

6 0
3 years ago
Why does the reporter have a tube up his nose?
Fittoniya [83]

Answer:

"To accurately measure core temperature" the reporter have a tube up his nose

Explanation:

The tube seen entering the reporter's nose is a thermistor which is used to measure the core temperature of the body with very high levels of accuracy. The tube reaches the esophagus, which is one of the most preferred locations for measuring the core temperature. The core body temperature is the operating temperature of the human body and it refers to the temperature of the deeper structures of the body instead of the peripheral tissues.  The esophagus is close to the left ventricle of the heart, it has a deep body location and a quick response to any changes in the body temperature. 

7 0
3 years ago
Give a reasonable explanation as to why the energy is represented by a pyramid shape
Kisachek [45]

Answer:

Describe why the pyramid shape is used to represent energy, biomass, and numbers pyramids. The pyramid is used because it can represent energy available at every trophic level, and at each level everything gets smaller as you go up the pyramid. ... Autotrophs obtain energy from nonliving sources and are producers.

Explanation:

8 0
3 years ago
Other questions:
  • HEEEEEEEEEEEEEELLLLLLLLLLLLLLLLLPPPPPPPP
    11·2 answers
  • Select all the apply proteins__.
    14·1 answer
  • What is the probability that their first child will also be homozygous dominant for curly hair?
    6·1 answer
  • Can someone please help me with biology on chromosomes?
    6·2 answers
  • Sediments derived primarily from the products of weathering on the continents are called _____.
    8·1 answer
  • Protists are often grouped according to whether they are plant-like, fungus-like, or________.
    8·2 answers
  • Your service club is offering a prize for the best community educational plan. Not only would you love to win the prize, but you
    5·1 answer
  • Can someone please help me answer this please?
    14·1 answer
  • Which determines the reactivity of an alkali metal?
    12·1 answer
  • Incomplete expansion of the lung or a portion of lung is termed _____, which may be produced by _____
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!