Jews are a "race"

Jews belong to a unique race. They remained pure and never accepted converts.

Unlike Palestinians, Jews descend from the people who used to lived in the land of Israel +2000 years ago.

Response 1
...Jews, those few who are indigenous to Palestine and the Levant, are Semites......Arabs. Semites are the tribes that use the Semitic language group, which includes Arabic and Hebrew (a dead language, spoken only in Israel). In the World today, there are several hundred million speakers of Arabic and  under 10 million who speak Hebrew.

As of the Ottoman census of 1878, there were approximately 15,000 indigenous Jews in Palestine. All other Jews are foreign and the vast majority of those carry very little Semitic genetic material, some Jews have no trace of Semite.

The "Arab" genetic pattern has been in Palestine for at least 12,000 years and is believed to have been there for more than 23,000 years. Today, among indigenous Semitic tribes/ethnic groups, there are at least 200 Muslims for every Jew and even Christian Semites outnumber the Jews. After several generations of intermarriage with Caucasian, African and Asian Jewish colonists, there may well not be an indigenous Semitic Jew left in the world.

Jews
Many DNA studies have been done on Ashkenazi Jews who make up more than 75% of Jews world wide today.
 * Study #1:


 * "'Many of the maternal ancestors of modern Ashkenazi Jews were European converts, according to new research. Analysis of DNA samples has shown that on the female line, the Ashkenazim are descended not from the Near East but from southern and western Europe.'"
 * DNA research sheds light on ancestry of Ashkenazi Jews


 * Study #2
 * "Therefore, whereas on the male side there may have been a significant Near Eastern (and possibly east European/Caucasian) component in Ashkenazi ancestry, the maternal lineages mainly trace back to prehistoric Western Europe. These results emphasize the importance of recruitment of local women and conversion in the formation of Ashkenazi communities, and represent a significant step in the detailed reconstruction of Ashkenazi genealogical history."
 * A substantial prehistoric European ancestry amongst Ashkenazi maternal lineages



Palestinians
Genetic studies show that the Palestinians had been living on the land for thousands of years, and are direct descendents of the Jews who lived there in ancient times, along with the other indigenous inhabitants who mixed in with the Jews at the time. After the Arab invasion in the 7th century, they interbred with the Arabs.

Here is evidence from studies: http://www.rense.com/general48/palestinians.pdf

http://epiphenom.fieldofscience.com/2009/01/shared-genetic-heritage-of-jews-and.html

http://www.sciencedaily.com/releases/2000/05/000509003653.htm

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC18733/

Response #3
Photos source: http://ziomania.com/ashkenazi/ashkenazi.htm