Lactose operon genes are examples of: a) housekeeping genes
b) genes that are transcribed at a constant rate
c) genes with a GC-rich promoter
d) none of the above

Ais a landform that is formed at the mouth of a river from the deposition of sediment carried by the river as the water flows.

Anurse is caring for a 42-year-old client who is scheduled for an amniocentesis during the fifteenth week of gestation because of concerns regarding down syndrome. what other fetal problem does an examination of the amniotic fluid reveal at this time?

Crossing over is a method of (blank)?