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
likoan [24]
3 years ago
15

In the 1920s, bacteriologist Fred Griffith demonstrated that a heat-killed, infectious pneumococcus produced a substance that co

uld convert a harmless form of the bacterium into a lethal one. Fifteen years later, researchers prepared an extract from the disease-causing S-strain pneumococci and showed that this material could transform the harmless R-strain cells into the infectious S-strain form. This change to the bacteria was both permanent and heritable, suggesting that this "transforming principle" represents the elusive genetic material of the cells. But what kind of molecule was it?The researchers subjected their extract to a variety of tests to determine the chemical identity of the "transforming principle." In one experiment, they treated the material with enzymes that destroy all proteins. This treatment did not affect the ability of the extract to transform harmless bacteria into an infectious form.From this result, the researchers can conclude that:
Biology
1 answer:
Juliette [100K]3 years ago
5 0

Answer:

Some substance in the infectious S strain could change the harmless R strain into the more lethal form.

Explanation:

These first type of experiments where crucial to advance in DNA knowledge.

In one experiment, they treated the material with enzymes that destroy all proteins. This is important because scientist notice that there was something else that was causing the strain to change into a lethal form and was heritable (DNA).  Know a days we know that plasmids are responsible for such transformation.

You might be interested in
HELP! Me!
OLEGan [10]

Answer:

They camouflage

Explanation:

The peppered moths adapt to their surroundings. They blend in with their surroundings to avoid being eaten by their predators. Blending in with their surrounding also helps them to sneak up on and catch their prey.

I'm not too sure why they lay 100 eggs at a time but i think it's because the parents want to increase the survival of their eggs. Eggs sometimes are eaten by other animals and the parents want at least a few to survive.

8 0
2 years ago
HELP DUE IN 10 MINS!
Lorico [155]

Answer

C. Electron transport chain

3 0
3 years ago
1. Which type of soil does Kenneth have?
Blababa [14]

Answer:

homie got dirt

Explanation:

7 0
3 years ago
Read 2 more answers
A 2006 genetic study of a large American family (Ikeda et al., 2006) identified a genetic linkage between DNA markers on chromos
nirvana33 [79]

Answer:

Yes

Explanation:

This is solely because a lod score for SCA5 and marker A is >3.0, so it indicates statistical significance.

3 0
3 years ago
Which human body system do you most resemble to ribosomes and why?
dusya [7]
Cell is a plant and organelle is a nucleus
5 0
3 years ago
Read 2 more answers
Other questions:
  • Which describes the missing step?
    10·1 answer
  • match the items the illustration with the number that represents the lowest to the level of organization in the illustration?
    7·1 answer
  • The major site or organ in the body for metabolic processing of carbohydrates is the
    9·1 answer
  • The most common danger related to the destruction of CD4 T cells is
    6·1 answer
  • Molecular biology of the cell​
    9·1 answer
  • How many oxygen atoms are in one unit of the compound Ba(0H)2
    11·1 answer
  • You are given a slide of a pathogen that is Gram-negative and whose subcellular structures can be observed with a light microsco
    10·1 answer
  • 17. Which of these processes is the result of the motion of particles in a gas or liquid?
    14·1 answer
  • Assume a seed eating finch population is currently at carrying capacity and the availability of food decreases dramatically. Wha
    12·1 answer
  • Which question is a nonscientific question?
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!