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
Paraphin [41]
3 years ago
8

In addition to identifying the genetic material, the experiments of Avery, MacLeod, and McCarty with different strains of Strept

ococcus pneumoniae demonstrated that
Biology
1 answer:
guajiro [1.7K]3 years ago
8 0

Answer:

DNA may be taken up by bacterial cells and be active.

Explanation:

To understand Avery, MacLeod, and McCarty's experiment, it is important to know Frederick Griffith's precursor experiment. The microbiologist worked at the British Ministry of Health's Pathology Laboratory with pneumococci (commonly known as the bacterium Streptococcus pneumoniae, then known as Pneumococcus, which causes pneumonia), which were previously classified into several types. When cultured in petri dishes in the laboratory, the pneumococci that synthesize their capsules generate 'smooth' colonies. Subcutaneous injection of liquid culture of these pneumococci into mice causes their death.  However, in vitro culture also allows the emergence of rough colonies', whose bacteria have lost the ability to synthesize mucopolysaccharide (and therefore have no capsules). Rough mutants could no longer be classified with sera and, moreover, lost their virulence: mice inoculated with them remained alive, unlike inoculated with smooth pneumococci.

The nature of Griffith's transforming principle remained unclear until the work of Avery, MacLeod, and McCarty. They repeated the in vitro transformation of pneumococci at the Rockfeller Institute for Medical Research, but replaced heat-dead cells with a purified fraction of smooth bacterial extract (unable to cause disease alone) and treated the material with different enzymes, each capable of destroying a specific type of macromolecule.  Experience has shown that this fraction retained its transforming capacity when treated with protein or RNA degrading enzymes, but lost that ability when treated with DNA degrading enzymes. These results indicated that the chemical nature of the 'transforming principle' was DNA.

Thus, we can conclude that in addition to identifying genetic material, Avery, MacLeod and McCarty experiments with different strains of Streptococcus pneumoniae demonstrated that DNA can be absorbed by bacterial cells and be active.

You might be interested in
Answer please!!!
mezya [45]
Dogs, no matter what breed they are, they are all of the same species and therefore can breed with each other and create fertile offspring
 
I pray this helps you :)
6 0
3 years ago
Read 2 more answers
I'll give you a brainliest if is right or at least shows some effort
insens350 [35]

Answer:

Celestial microwave radiation found a strange microwave signal causing background noise in the radio telescope. The signal came from every direction. The young universe would have been very hot. The microwave background radiation is the remaining heat from the Big bang.

I tried my hardest and this is what I put on MY test so good luck

4 0
3 years ago
(50 points)
Yuri [45]
Good luck honey! you got this :) and if you fail i’m still proud of you
7 0
3 years ago
Assume that for a given gene a mutation creates an allele that functions as a dominant negative. The gene codes for a protein th
OlgaM077 [116]

Answer: 100%

Explanation:

if the mutation presents autosomal dominant inheritance, each affected individual will show 100% alteration in the protein, thus , being dominant, it is considered that the disease pattern will predominate even if it has genes that do not express it since these will be recessive and canceled by the dominant ones.

3 0
3 years ago
How do the terms enzyme, substrate, and active site relate to each other? ​
USPshnik [31]

Can you put the terms as well, please

5 0
3 years ago
Read 2 more answers
Other questions:
  • Egardless of the selection methods used, it is essential that the selection procedure be:
    13·1 answer
  • Describe a structural adaptation that wolves have for getting energy.
    5·1 answer
  • Hey everyone!! Please help me in science please. I will give brainliest 30 points
    6·2 answers
  • Gene flow is the movement of genes across barriers such as mountains, oceans, or deserts. These barriers are usually natural. Ho
    14·2 answers
  • Earlobes can be either attached or detached. The allele for attached earlobes is recessive (e), and the allele for detached earl
    11·2 answers
  • Which type of cell has a large, central vacuole that controls water pressure?
    6·2 answers
  • Please hurry I’m being TIMED
    7·2 answers
  • Describe the role of an enzyme. Describe how an enzyme interacts with its substrate.​
    8·1 answer
  • Describe what happens as a plant's turgor pressure increases and decrease AS MUCH POINTS AS I CAN GIVE​
    5·1 answer
  • Please help. Please be 100% sure of your answer. Thank you. ​
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!