Practice Questions

TLS Online TPP Program

#Question id: 4765

The recessive mutant allele that causes cystic fibrosis is much more frequent in Caucasians population than in other world populations. Some scientists believe heterozygotes must have had a survival advantage during plagues such as cholera that occasionally swept through this population. What concept does this illustrate?

#XL - R Botany

More Questions

#Question id: 2660

#XL - T Zoology

In the lactose operon, the molecule that causes the repressor to fall off the promoter is which of the following?

#Question id: 2661

#XL - T Zoology

In the histidine operon, if the codons coding for histidine were removed, which of the following would you predict would happen?

#Question id: 2662

#XL - T Zoology

In the tryptophan operon, tryptophan serves as ________________.

#Question id: 2663

#XL - T Zoology

A ______________ is a collection of clones that, among themselves, contain all the DNA sequences of the organism.

#Question id: 2664

#XL - T Zoology

Which of the following is an example of positive gene regulation?

#Question id: 2665

#XL - T Zoology

A transposon ____________.