Answer:
After C14, Uranium238 is most widely used mineral in geological or archaeological dating.
Explanation:
U238 is generally used to date the rock materials, to know the age. As we know the half-life of U238, it is easy to identify the age of the materials containing uranium 238. It can be called as absolute dating method as it determines the exact age of the uranium contained material. It is a type of radiometric dating.
Answer:
A.) transcription factors
Explanation:
Transcription factors are often very important in initiating patterns of gene expression that result in major developmental changes.
Answer:
B. Metamorphic
Explanation:
Metamorphic rock is combination of different rocks and builds off pre-existing rocks. This creates layers.
Danish scientist Hans Christian Gram devised a method to differentiate two types of bacteria based on the structural differences in their cell walls. In his test, bacteria that retain the crystal violet dye do so because of a thick layer of peptidoglycan and are called Gram-positive bacteria. In contrast, Gram-negative bacteria do not retain the violet dye and are colored red or pink. Compared with Gram-positive bacteria, Gram-negative bacteria are more resistant against antibodies because of their impenetrable cell wall. These bacteria have a wide variety of applications ranging from medical treatment to industrial use and Swiss cheese production.
