Period marks the end of one menstual......
Answer:
Threonine has two chiral centers.
The correct options are c. carbon b and d. carbon c
Explanation:
Chiral centers are those that have four different groups of atoms bonded to it. Carbon a has three atoms of hydrogen attached to it so it can't be a chiral carbon. It isn't the carboxyl carbon either since it is double bonded to oxygen. And the amino nitrogen does not qualify anyway because it is bonded to three different groups of atoms, not four.
different chemical reactions can occur in isolation of each other.
Further explanation
cells can be divided into 2 types according to the presence or absence of the cell nucleus membrane. Cells that do not have a nuclear membrane are called prokaryotic cells. Whereas cells that have cell nuclei are called eukaryotic cells. There are theories of biological evolution and the origin of life that explain the origins of prokaryotic and eukaryotic cell formation.
there is a theory that believes that eukaryotic cells are formed from the prokaryotic cell revolution which continues to grow increasingly complex.
actually the origin of life began in the ocean through the formation of organic compunds from simple compounds, then these compounds will continue to develop into more complex compounds. Simple complex compounds that will form a complex called primordial soup or primordial soup.
The formation of genetic material and cell membranes is believed to be two important steps after the formation of primordial soup and before life. The first genetic material and the first enzyme may be RNA.
Protobion develops into complex forms that contain DNA and can use many raw materials from the environment. Protobion will be replaced with organisms that can make the molecules they need (autotrophs).
Learn More
eukaryotic cells : brainly.com/question/10816752
Details
Class: college
Subject: biology
Keywords : eukaryotic, prokaryotic, material
Answer:
the answer is E.
Many observable characters that vary in pea plants, in fact are controlled by multiple genes instead of single genes...
