The answer is B. Geology has shown a thin layer of iridium (a rare mineral on earth but found on asteroids and meteors) in the rock layers between the Cretaceous and Paleogene periods. Below this layer are numerous fossils of pterosaurs and dinosaurs, but above the layer are drastically few. The aftermath of asteroid impact is believed to have smothered most vegetation from earth which dinosaurs depended on as a source of food.
RNAi is a mechanism involved in gene silencing, the process that turns on and off genes. To do that, it is triggered by double-stranded RNA (dsRNA).
The enzyme "dicer" cuts dsRNA into smaller fragments called (a) small interfering RNA. Once these fragments are cleaved, they bind to argonaut proteins and activate the RNA-induced silencing complex (RISC). This complex targets and degrades (a) specific messenger RNA (mRNA). By degrading the mRNA, this process interrupts the gene expression.
Answer:
- use of economical model organisms
- collaborating with other scientists with same interests
Explanation:
Using the field of biomedical research as a case study, scientists navigate through limited funding by:
1) trying their investigations on cheaply and readily available organisms such as yeast or worms like C. elegans rather than more complex and expensive higher organisms like wistar rats or Guinea pig
2) forming alliance with other notable scientists in nearby laboratories equipped with a resource or more that is unavailable insitu (at the main research lab)
Answer:
2.carbon nanotubes for stain resistant clothes
Explanation:
