Indentify what category (protein, carbohydrate, or lipid) each of the following is:

hemoglobin, ligaments, RNA, DNA, muscle fibers, cholesterol

I thought RNA and DNA were nuecleotides.. but who knows? Thanks in advance.

If those are the only 3 possible answers, then your instructor should return to university. Please click the follownig links for references.

http://www.google.com/search?as_q=&num=10&hl=en&btnG=Google+Search&as_epq=dna+is+not+a+protein&as_oq=&as_eq=&lr=&as_ft=i&as_filetype=&as_qdr=all&as_nlo=&as_nhi=&as_occt=any&as_dt=i&as_sitesearch=&as_rights=&safe=images

http://en.wikipedia.org/wiki/Muscle_fiber

To identify the category of each item, let's take a closer look at the properties of hemoglobin, ligaments, RNA, DNA, muscle fibers, and cholesterol.

1. Hemoglobin: Hemoglobin is a protein. It is responsible for carrying oxygen in the blood. It is made up of amino acids linked together in a specific sequence.

2. Ligaments: Ligaments are tough, fibrous tissues that connect bones to other bones. They are mainly composed of collagen, which is a protein.

3. RNA: RNA stands for Ribonucleic Acid. It is a molecule involved in the synthesis of proteins. RNA is not classified as a protein or carbohydrate, but rather as a nucleic acid.

4. DNA: DNA stands for Deoxyribonucleic Acid. It is also a nucleic acid, not a protein or carbohydrate. DNA contains genetic information and serves as a blueprint for the production of proteins.

5. Muscle fibers: Muscle fibers are long, cylindrical cells that make up muscles. They are mainly composed of proteins, primarily actin and myosin, which are responsible for muscle contraction.

6. Cholesterol: Cholesterol is a lipid. It is a type of fat that is essential for building cell membranes and producing hormones in the body.

In summary, the identified categories are:
- Hemoglobin and ligaments: Protein
- RNA and DNA: Nucleic Acid
- Muscle fibers: Protein
- Cholesterol: Lipid

Regarding your comment about RNA and DNA being nucleotides, you are partially correct. Nucleotides are the building blocks of nucleic acids, including RNA and DNA. Both RNA and DNA are polymers of nucleotides, but they are not classified as nucleotides themselves.

If you want to learn more about any of these categories or confirm the information provided, you can refer to the links provided. The first link is a Google search query for "DNA is not a protein" to find references related to that topic. The second link leads to the Wikipedia page on muscle fibers for more detailed information.