Praxis 5025 Human Biology Questions With Answers
gene
is a unit of genetic information
DNA
makes up genes, which in turn make up the chromosomes. It is wound tightly around proteins in order to conserve space. It is capable of making copies of itself
chromosome
is made up of DNA/protein com...
gene
is a unit of genetic information
DNA
makes up genes, which in turn make up the chromosomes. It is wound tightly around
proteins in order to conserve space. It is capable of making copies of itself
chromosome
is made up of DNA/protein combination
DNA replication
enzymes control each step of the replication of DNA. The molecule untwists. The
hydrogen bonds between the bases break and serve as a pattern for reprication. Free
nucleotides found inside the nucleus join on to form a new strand. Two new pieces of
DNA are formed which are identical. This is a very accurate process. There is only one
mistake for every billion clucleotides added. This is because there are enzymes present
that proofread the molecule. In eukaryotes, replication occurs in many places along the
DNA at once. the circular plasmids, replication begins at a point on the plasmid and
goes in both directions until it meets itself.
Human organ systems
all of the major body systems work in a complementary way to promote well being.
There is a continuation within the body, with each system being interconnected. The
function of the cardiovascular system is to carry oxygenated blood and nutrients to all
cells of the body and return carbon dioxide waste to be expelled from the lungs.
Through beathing, the lungs function to bind oxygen to hemoglobin. Oxygen is then
carried via the circulatory system and is delivered to muscles, which rely on oxygen to
contract. The circulatory system also functins by removing carbon dioxide waste. The
digestive and excretory systems are also linked. The function of the digestive system is
to break food down into nutrients and absorb it into the blood stream where it can be
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