The half-life of cobalt 60 is 5.3 years. What fraction of a sample remains after 21.2 years?

A.

one half

B.

one quarter

C.

one eighth

D.

one sixteenth

Why can gel electrophoresis separate DNA fragments? O A. DNA fragments are positively charged. O B. DNA fragments are negatively charged. O C. DNA fragments are magnetic. O D. DNA fragments are all the same size.

Whats the name of a protein that speeds up chemical reaction

Plants also have a circulatory system to transport nutrients to and from cells. [phloem and xylem] True False

In the periodic table of elements, what do all of the elements in row 2 have in common? A. An atom of each element can hold up to eight electrons in its outer energy level. B.

A process in which chromosomal segments are exchanged between a pair of homologous chromosomes wordsearch

What do directional selection and disruptive selection have in common?

How does biotechnology can increase or decrease variation

Why is there very little methane in Earth's atmosphere compared to the amount of carbon dioxide

Which process makes it possible for the major organs of the body to be formed by week 10 of human development

How are gases distinguishable from a solid or liquid at the molecular level?