answer.
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
N76 [4]
1 year ago
14

1. Laura uses a cotton swab to collect microorganisms from a hand rail and streaks a plate. On the fourth day of incubation, she

does not observe visible microbial growth. Given that microorganisms are literally everywhere, give at least three reasons why Laura may not have observed microbial growth?
Biology
1 answer:
weeeeeb [17]1 year ago
3 0

Answer:

The Laura tried to grow micro-organisms in culture broth medium in Petri-plates but the microbial growth was not observed even on the fourth day of culture which could be due to:

1. Laura could have not provided the correct broth medium maintaining the with pH and salt concentrations.

2. Microorganisms did not get optimal growth conditions.

3. The bacterial source could have died after the collection which could have lysed after their death and thus no longer visible.

You might be interested in
Match the characteristics below to either monocots or dicots
Radda [10]
Monocots have <em>parallel veins in leaves </em>while dicots have <em>netted veins in leaves. </em>Usually, monocots only have <em>herbaceous</em> stems while dicot stems can either be <em>herbaceous or woody. </em>Examples of monocots are <em>corn, asparagus, and grasses</em>. Examples of dicots are <em>beans, peaches, and potatoes.</em>
4 0
2 years ago
Read 2 more answers
In theatrical productions, the health and safety of actors and crew often depend on what?
emmainna [20.7K]

The health and safety of actors and crew relies on lightweight set pieces in theatrical productions. Light weight materials were use so nobody will experience bumps or bruises especially on the heavy action part. 

Moreover, during the production, everyone is required to be healthy in the set for everybody have more than one job. All actors and crew must be ready with the different pace of the scenes so their minds are set on what to do and avoid unnecessary stress.

4 0
1 year ago
Iodine is a yellowish solution. A starch solution is white. A starch solution turns purplish-black in the presence of iodine. If
cupoosta [38]

Answer:

The correct answer will be- the color change will be observed and the solution will turn purplish-black.

Explanation:

Iodine test is performed to test the presence of the carbohydrates mainly starch.

The iodine solution is chemically called potassium iodide which forms a yellow solution. The potassium iodide solution forms a complex with a starch solution which appears a purplish-black color which shows the presence of the carbohydrates.

In the given question, if we add the iodine solution to the beaker after a certain point of time then it will still form a complex with the starch and thus beaker solution will appear darker in color.

6 0
1 year ago
Darwin hypothesized that new species could appear gradually through small changes in an ancestral species. What experiment did h
Marianna [84]
He watched animals in their natural habitat and started research on them. Each animal have a unique place to live and they have all different ways to survive in their habitat. That is evolution, small changes became a huge help for these animals for their struggle to survive. He saw how animals could evolve so quickly into a new habitat, using their mental and physical skills to do that.
3 0
2 years ago
Read 2 more answers
Finch species living on the islands exhibit a variety of beak types that favor different foods.Finches that eat seeds and plant
Neko [114]
The answer would be Finches because.... the eat plants those are easy to find .
hope this helps
3 0
2 years ago
Read 2 more answers
Other questions:
  • A fish that normally lives in salty water is placed in a tank containing fresh water. What do you think will happen to the cells
    14·2 answers
  • A researcher tests the hypothesis that large, daily doses of vitamin c help protect against catching the common cold. what would
    10·1 answer
  • A gazelle eats plants. A lion then eats the gazelle. What percentage of the energy fixed by the plants is available to the lion?
    9·1 answer
  • Bacteria may be killed during cooking, but may leave behind ______ that will later grow and produce more bacteria.
    15·1 answer
  • What does barry see when he leaves the hive for the first time
    5·1 answer
  • A row of 100 million atoms of a single type would be only about 1 centimeter (cm) long. What occupies most of this space?
    15·1 answer
  • Identify the bonds that connect the protein structures in a pleated sheet.
    9·1 answer
  • Chrysanthemums are short-day plants that normally flower in late fall. Suppose you were a chrysanthemum grower and you would lik
    15·1 answer
  • With the endosymbiotic hypothesis in mind, what structure within modern-day chloroplasts is likely derived from the cytoplasm of
    9·1 answer
  • Answer these questions based on what you learned from the lesson.
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!