It is important to note that such animals living in desert conditions do not waste water by sweating to control body temperature. They mostly try burrowing during the day time to avoid getting dehydrated. Their urine is highly concentrated and it is mostly in the form of uric acid. These means help the desert animals to survive in such harsh conditions.
Gigantism
and acromegaly are the two diseases resulting from hyper function of the
pituitary gland.
Gigantism
and acromegaly are conditions that are nearly always due to a pituitary adenoma
that is because of excessive secretion of a growth hormone called hypersomatotropism.
<span>If GH
hypersecretion begins in childhood, before closure of the epiphyses pituitary
gigantism occurs. It is a rare condition where skeletal growth velocity and
ultimate stature are increased, but little bony deformity occurs. However,
soft-tissue swelling occurs, and the peripheral nerves are enlarged. Hypogonadotropic
hypogonadism and deferred puberty is also normally present, resulting in a
eunuchoid habitus. While Acromegaly
occurs after the growth plate cartilage fuses in adulthood, it is the same
disorder of IGF-I excess but in acromegaly, an unadorned disease that morbidity
and mortality rates are high because its often diagnosed late, where the
disease is associated with cardiovascular, cerebrovascular, and respiratory
disorders and malignancies. </span>
The answer is 'Cambrian' explosion. This took place approximately 541 million years ago. 'Explosion' refers to the evolution of a large range of new major animal phyla. Scientists know this by the large number of diverse fossils from this period. Prior to this period, organisms were single-celled, but over the Cambrian Explosion, lasting about 80 million years, life forms diversified rapidly to resemble the life forms existing today.
Answer:
A mutation in <u>DNA </u>results in a change in <u>RNA </u>that sometimes produces a <u>protein </u>with altered structure and function.
Explanation:
DNA is the hereditary material which causes gene expression in our body by producing protein. The type of protein which is produced by DNA totally depends upon the sequence of nucleotides in the DNA. But, DNA molecule does not produce protein directly. Initially it produces RNA (mRNA, tRNA, rRNA) by the process of transcription, the nucleotides in the RNA are complimentary to those in DNA. In short, the message regarding the structure and composition of the type protein to be produced by DNA is first decoded from DNA in the form of RNA. These RNA molecules then synthesize the protein as per the instructions from DNA by the process of translation.
But, in case a mutation occurs in the DNA which causes a change in it's nucleotide/nucleotides, the protein which will be produced will be different in the structure and function than the protein which was supposed to be synthesized. It happens because, a triplet of nucletiodes in the DNA and hence RNA specifies a particular type of amino acid and several amino acids are joined in a long chain to form polypeptide which ultimately forms protein. But, if any nucleotide in the triplet is changed due to mutation it may change the amino acid and if amino acid will change the protein will also get altered.
C. membrane bound organelles
Hope this helps!
