You have to pay a(n)premium for express delivery. A: extra charge B: extra price C: extra tip D: extra bonus

The earliest discovery of human beings and the most common chromosomal disease in clinic, is the following:

Several chromosomal loci _____ in tumorigenesis of pancreatic endocrine tumors (PET) have been identified.

Which words have different meaning as extranuclear inheritance: A: Mendelian inheretance B: extra-chromosomal inheritance C: cytoplasmic inheritance D: maternal inheritance

Which words have different meaning as extranuclear inheritance: ( ) A: Mendelian inheritance B: extra-chromosomal inheritance C: maternal inheritance D: cytoplasmic inheritance

If demand is price elastic and price decreases, then A: the extra revenue from the extra units sold is exactly offset by the loss in revenue due to the lower price B: more information is necessary to determine what happens to total revenue C: the extra revenue from the extra units sold is less than the loss in revenue from the lower price D: the extra revenue from the extra units sold exceeds the loss in revenue from the lower price

Providing extra information___________________________

Go The Extra Mile

中国大学MOOC: A bacterial cell transfers chromosomal genes to F-cells, but it rarely causes them to become F+. The bacterial cell is:

There is an extra charge of 100% for express service.