We evaluated the associations between serum omega-3 and omega-6 poly-unsaturated fatty acid levels and colon cancer risk in a study conducted between 1997 and 2002. We included 363 cases of colon cancer and 498 disease-free controls. Serum omega-3 poly-unsaturated fatty acid levels were inversely associated with colon cancer risk. Subjects in the upper 33% of serum omega-3 poly-unsaturated fatty acids had a 33% lower risk of colon cancer as compared with subjects in the lower 33% of serum omega-3 poly-unsaturated fatty acids. In contrast, the risk of colon cancer was increased by omega-6 poly-unsaturated fatty acids by 68%. This is the first study that simultaneously finds an inverse association of serum omega-3 poly-unsaturated fatty acids and a positive association of omega-6 poly-unsaturated fatty acids with colon cancer. The study design is a:

大部分真核细胞mRNA3'末端都具有( )。 A: poly A B: poly C C: poly U D: poly G

中国大学MOOC: Unsaturated fats are typically at room temperature.

The unsaturated zone (vadose zone) is the area above the zone of saturation.

求多项式[img=258x27]17de9124b2c58e4.png[/img]中变量[img=11x14]17de5fbe7011053.png[/img]的最高次幂系数应输入 A: poly=(x^2*y+2y)^3+5x^6*y^2+2x^2Coefficient[poly,x^[Exponent[poly,x]]] B: poly=(x^2*y+2y)^3+5x^6*y^2+2x^2Coefficient[poly,x^(Exponent[poly,x])] C: poly=(x^2y+2y)^3+5x^6y^2+2x^2Coefficient[poly,x^[Exponent[poly,x]]] D: poly=(x^2*y+2y)^3+5x^6*y^2+2x^2Exponent[poly,x];Coefficient[poly,%]

大部分真核细胞的mRNA的3'－末端都具有 A: Poly T B: Poly G C: Poly A D: Poly C

中国大学MOOC: Phospholipids with short or unsaturated fatty acyl chains

真核细胞mRNA前体加工过程中，加尾是指在3’端加入（ ）尾巴 A: poly U B: poly T C: poly A D: poly C

成熟的真核生物mRNA5’端具有 A: poly(A) B: poly(U) C: poly© D: 帽子结构

真核生物mRNA的3′-末端尾巴结构是（） A: 约200个核苷酸的poly约200个核苷酸的poly约100个核苷酸的poly（G） B: 约200个核苷酸的poly（U） C: 约300个核苷酸的poly（U）