1. cattle breeders routinely use cryo-preserved bull sperm to impregnate cows. a typical sample contains about 1 x 108 sperm and the size of the haploid cattle genome is 3.2 x 109 base pairs. if the chromosomal dna extracted from the sperm were arranged end-to-end, about how many football fields would it cover (1 football field = 100 yards, 1 meter = 1.1 yards)? one more fact is required to solve this problem and it can be found in the textbook or online.2. parvovirus causes a deadly intestinal disease in dogs. the canine virus likely evolved from a closely related virus that infects cats, and initiated a worldwide pandemic of susceptible dogs in 1978. parvovirus dna isolated from infectious viral particles contains 25% a, 33% t, 22% c, and 20% g residues. a. do these results seem peculiar? why or why not? b. how might you explain these values?

the answer is d. exposing corruption in the church

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.

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.