Which of the following statements describes each new molecule of DNA
produced when DNA replicates?

A. Each new molecule is half the length of the original molecule.

B. Each new molecule has only the coding portions of the original molecule in its
sequence.

C. Each new molecule contains one strand from the original molecule and one newly
synthesized strand.

D. Each new molecule retains the A, C, and G bases in the DNA sequence but replaces
the T base with U.

C. Each new molecule contains one strand from the original molecule and one newly synthesized strand.

C). Each new molecule contains one strand from the original molecule and one newly

synthesized strand.

Explanation: DNA replication is semiconservative. This means that each strand of the double-stranded DNA molecule serves as a template for the synthesis of a new strand. Each of the two double-stranded DNA molecules during replication contains one old strand and one new strand.

Before DNA polymerase begins replication, an enzyme known as helicase unwinds the double-stranded helical DNA molecule to create access to each strand so that each strand will serve as a template for the synthesis of a new strand.

question#1

ans:

cell is the basic unit of organization of all living things. cells are often called the building block of life and it is the smallest unit of life. the study of cell is called cell biology. cell consists of cytoplasm enclosed within membrane, which contain bio-molecules such as proteins and nucleic acid.

two third of cell is water, which means that two-third of your whole body is water. the rest is the mixture of molecules, mainly proteins, lipids and carbohydrates.

question#2

ans:

organ:

an organ is a group of tissues specialized to form a functional unit. an example is the heart in animals.

organ system:

an organ system is a group of several organs whose functions are synchronized to release an effective action in a living organism. an example is digestive system.

question#3

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#4

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system—working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#5

our body works because of the interactions that happen between organs and organ systems.  

for example:  

the heart to regulate blood flow throughout the body. the blood carries oxygen and nutrients to the cells and carries carbon dioxide and waste away from the cells. body systems work together in maintaining a constant internal environment. when this balance is disrupted, the body systems may not function properly, and human health can suffer.   you start to feel bad.