Question
Asked Sep 10, 2019
23 views

What are the most common shapes and arrangements of bacteria and provide a specific example for each.

check_circle

Expert Answer

Step 1

Bacteria are single-celled prokaryotic organisms. They lack the nucleus and membrane-bound organelles and hence are categorized as simple organisms. Their genetic material is circular in shape. Bacteria can be classified based on their shapes and colonial arrangements after examining them under the microscopes. Another property of bacteria is that they grow in colonies, that is, from one mother bacterium all the other bacteria are produced by simple cell division.

Step 2

The three important shapes of bacteria are:

  1. Cocci- They are the round or spherical shaped bacteria.
  2. Bacilli- They are rod-shaped bacteria.
  3. Spirilla- They are curved or spiral-shaped bacteria. Most of these bacteria are rigid and motile.

Arrangements of these different types of bacteria-

  1. Arrangement of Cocci bacteria: Cocci can be found single, in pairs, in groups of four cocci, in chains, and in clusters. They can be elongated, flattened, or oval.
  2. Diplococci- Such bacteria are round and are found in pairs. Example of this is Streptococcus pneumoniae.
  3. Streptococci- Streptococcus bacteria arrange themselves in chains. Example of this is Streptococcus pyogenes.
  4. Tetrads- In this, the cocci are arranged in a group of four cells. These four cells are arranged in such a manner, that two cells lie in one plane and other two cells lie in another cells. Hence, such arrangement divides these four cells into two planes. Example of this is Aerococcus.
  5. Sarcinae- In this, the cocci are arranged in cuboidal shape. So, it is the three-dimensional shape of the cocci cluster. Example of this is Sarcina ventriculi.
  6. Staphylococci- Here, cocci are arranged in an irregular pattern making the cells look like the grape-like clusters. Example of this is Staphylococcus aureus.

 

Arrangements of Bacilli:

  1. Diplobacilli – Such type of bacillus is found in pairs after they had ...

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in

Science

Biology

Microbiology

Related Biology Q&A

Find answers to questions asked by student like you

Show more Q&A add
question_answer

Q: vivax is one of several malaria-causing Plasmodium species that form hypnozoites in the liver, which...

A: When P. vivax is injected into the bloodstream by mosquitoes, they are in the sporozoite form. This ...

question_answer

Q: What characteristic is shared by fats, oils, phospholipids and sterols?

A: Lipids, as a class of compounds, are insoluble in water but are soluble in other organic solvents. E...

question_answer

Q: How do I work pH equations on my calculator? -log(H+)=pH pH=7.6, how do i find the concentration of ...

A: pH is a measure of how acidic or basic a solutuion is. It is the negative base 10 logarithm of the h...

question_answer

Q: What are the major functions of cilia and microvilli?

A: A cilia is an organelle which is found in eukaryotic cells. They are basically projections from the ...

question_answer

Q: Jlans 29 Name Date Section REVIEW Check Your Recall a neutral solution has a pH Fill in the blanks: ...

A: Hello there! As you have posted multiple questions and not specified which question needs to be solv...

question_answer

Q: What are the factors that influence the productivity of tropical forests?

A: The questions ask about the factors affecting the productivity of tropical forests.

question_answer

Q: Black fur is a dominant trait. Two black cats mate and produce 6 black kittens 4. and 2 white kitten...

A: It is required to determine the genotype and phenotype of the parent cats, the genotype of the kitte...

question_answer

Q: 2. A red snapdragon is crossed with a white snapdragon plant. Red pigment is incompletely dominant a...

A: Sometimes, a cross between organisms with two different phenotypes produces offspring with a third p...

question_answer

Q: Please explain the difference between Adult Stem Cell and Embryonic Stem Cells.

A: The differences between embryonic stem cells and adult stem cells.