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Gnoma [55]
3 years ago
11

Stem cells are important because _____.

Biology
1 answer:
lianna [129]3 years ago
6 0
Stem cell are important because stem cells represent an exciting area in medicine because of their potential to regenerate and repair damage tissue .
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Levene made which contribution to our understanding of DNA structure? a. He determined that the nucleus contains DNA. b. He dete
Stels [109]

Answer:

The correct answer is  b. He determined that DNA contains four nitrogenous bases.

Explanation:

Levene was an American biochemist who studied the structure of DNA in the early 1900s and in 1920 he found that DNA consists of four nitrogenous bases that are Adenine, Guanine, Thymine, Cytosine.

He also found deoxyribose sugar and phosphate group and said that nucleotide is the basic unit of DNA which contains a ribose sugar with attached nitrogenous base and phosphate group.

He also concludes that an equal amount of adenine, guanine, thymine, and cytosine makes the DNA which is now known as tetranucleotide hypothesis. So the correct answer is b. He determined that DNA contains four nitrogenous bases.  

8 0
3 years ago
The appearance of a fertile, polyploid individual within a population of diploid organisms is a possible source of new species.
Leokris [45]

Answer:

Sympatric speciation.

Explanation:

Sympatric speciation is a type of speciation that occurs when 2 types of groups of the common species live in the common geographic location, but they grow differently until they can no longer interbreed and are known as different species.

This speciation can occur in different types of species such as bacteria, the apple maggot fly, and cichlid fish, but it is difficult to tell when this speciation is happening or has occurred in nature. There are four types of speciation occurs:

1) Symmetric

2) Allopathic

3) Parapatric

4) Peripatric.

6 0
2 years ago
HELP QUICK PLEASE!!<br> i think it is B but im not sure
zalisa [80]
YES your correct answer will be the letter B
3 0
2 years ago
Read 2 more answers
A scientist discovered a new antibiotic and wanted to know if it would be effective against group A Streptococcus bacteria. He d
Tom [10]
An experiment is a process where the a scientist tests and draws their evidence and data from. Hence, this process is where the hypothesis be supported or negated.

Variables are traits, factors, or characteristics that either manipulated or measured being the subject to become the data.
The independent variable is B. 
<span>the presence of the new antibiotic</span>
6 0
3 years ago
When the bicep contracts and gets shorter, what does the tricep do?
Tema [17]
The triceps extends -----------
5 0
3 years ago
Read 2 more answers
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