Apparently I'm really bad at biology no matter how much I love it

The statement that correctly identifies the difference in the structure of proteins and polysaccharides is that only proteins are formed from amino acids joined by peptide bonds (option B)

Explanation:

Proteins are polymers whose monomeric units are amino acids. These monomers join together to form peptides —short chains of amino acids— and proteins, joined through peptide bonds.

Amino acids that form peptides and proteins follow a specific sequence, and the interaction between them gives rise to specific shapes and configurations of each molecule.

Unlike proteins, polysaccharides are polymers formed by monosaccharides — their monomers— which can form long repetitive monosaccharides chains that are joined by glycoside bonds.

The other options are not correct because:

    A. DNA is the polymer (nucleic acid) that is formed by sequences of cytosine, adenine guanine and thymine.

    C. Proteins are molecules that can be folded and twisted to very specific shapes.

    D. Not only proteins can be formed by long molecules.

advantage of using stem cells in medical research:

1.       it provides medical benefits in the fields of therapeutic cloning and regenerative medicine.

2. it provides great potential for discovering treatments and cures to a variety of diseases including parkinson disease, spinal cord injuries, diabetes, alzheimer’s disease and many more.

3. limbs and organ could be grown in lab from stem cells and then used in transplant or treat illness.

sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.