SSS 2009-12-30
时间：2018-12-02 作者：英语课 分类：Scientific American(十二)月
Before you pay big money for caviar, check with two New York City high school students. Brenda Tan and Matt Cost worked with DNA 1 barcoding experts at Rockefeller University and other researchers at the American Museum of Natural History to identify hundreds of food samples, assorted 2 hairs and animal bits in their neighborhood. The Trinity School seniors discovered 95 different species of animal and 11 cases of fraudulent food labeling. Their findings appear in the January issue of the journal BioScience.
The professional researchers provided DNA sequences for the samples the students collected. The kids then checked the sequences against the database at barcodinglife.org
The high schoolers found everything from pigeons and Pomeranians to an invasive latrine fly and what looks to be at least a new subspecies of cockroach 3. A supposed sheep’s milk cheese was actually from cows. And alleged 4 sturgeon caviar was just cheap Mississippi paddlefish eggs. But there was good news: all eight classmates who provided hair for the study turned out to be human.
- DNA is stored in the nucleus of a cell.脱氧核糖核酸储存于细胞的细胞核里。
- Gene mutations are alterations in the DNA code.基因突变是指DNA密码的改变。
- There's a bag of assorted sweets on the table.桌子上有一袋什锦糖果。
- He has always assorted with men of his age.他总是与和他年令相仿的人交往。