Radiometric dating, often called radioactive dating, is a technique used to determine the age of materials such as rocks. It is based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.
Answer:
secondary structure
Explanation:
Alpha helices and beta sheets are two main structural forms in secondary structure of proteins. This structures are formed spontaneously. The next step of protein structure formation is folding into tertiary three-dimensional form.
In diseases such as CJD and kuru, protein prion is changed in structure. It is not known how degeneration of priones protein structure occurs, but it can lead to neurodegenerative diseases which can even be fatal.
Priones are also known as proteinaceous infectious particles.
Change in gene frequency of ancient cockroaches led to the evolution of modern cockroaches.
Gymnosperms have cones, they’re sporophytes, so they’re capable of producing spores, they do reproduce by pollination and they’re vascular :)
