Answer:
such as tissue paper, do not allow light to pass through as easily, and images cannot be seen clearly. Opaque materials, such as wood and metals, allow no light to pass through.
Explanation:
A gastric intestinal tract is a series of hollow organs joined in a long twisting tube from mouth to anus . The hollow organs that make up GI tract are mouth , oesophagus, stomach , small intestine , large intestine and anus.
<h3>What is the function of GI tract ? </h3>
The function of GI tract is to breakdown of food into Carbohydrates ,fats and proteins.
2) The physiological functions of digestive tract is to digest and absorb food then excrete the waste products with the help of the liver, gall bladder, pancreas,small intestine ,large intestine and rectum.
The topic of small intestine ,I found the most valuable because it performs absorption .
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Answer:
1) A, C and D
2) D
Explanation:
The normal hemoglobin is made up of heme and globin. The protein, globin is in turn made up of four polypeptide chains which include two alpha and two beta chains.
The gene gene responsible for the creation of the beta globin chain is located on the short arm of chromosome eleven. It is called the HBB gene. Many mutations occur on the HBB gene and a mutation on this gene produces abnormal hemoglobin like HBS, hbc, and hbe. HBs causes sickle cell anemia.
In sickle cell anemia, there is an alteration of the genetic code, leading to the substitution of a single amino acid where glutamic acid is replaced by valine in the sixth position of the beta chain.
In the mRNA, the change converts a glutamic acid codon(GAG or GAA) to a valine codon(GUA, GUC, GUU or GUG).
Sickle cell anemia is caused by a transversion that leads to a missense mutation.
