Which muscle of the quadriceps femoris group lies on the side surface of the lower extremity?

 

The correct answer is choice C. DNA. DNA carries the genetic information in the cells of all living organisms. It contains codes for the assembly of amino acids into all the proteins required in the body. The sequence of bases in a DNA molecule can determine the order of amino acids in a protein molecule. Groups of three bases called codons represent different amino acids. This is the basis of the genetic code.

Choice A is wrong because mRNA is a type of RNA that carries the genetic information from DNA to the ribosomes, where protein synthesis takes place.

mRNA is not the original carrier of the genetic code, but a messenger that transfers it.

Choice B is wrong because tRNA is a type of RNA that brings amino acids to the ribosomes, where they are joined together to form proteins. tRNA has a complementary sequence to mRNA, called an anticodon, that allows it to pair with the correct codon on mRNA.

Choice D is wrong because chromosomes are structures made of DNA and proteins that contain many genes.

Chromosomes are not the carriers of the genetic code, but the structures that organize and store it.

Choice E is wrong because nucleotides are the building blocks of DNA and RNA. Nucleotides are composed of a nitrogenous base, a sugar, and a phosphate group.

Nucleotides are not the carriers of the genetic code, but the units that make up the code.

The correct answer is choice B. Ear wax.

Ceruminous glands are specialized sweat glands that are located in the external auditory canal.

They secrete a waxy substance called cerumen or ear wax by mixing their secretion with sebum and dead epidermal cells. Cerumen helps to protect the ear from physical damage and infection.

Choice A is wrong because sebum is secreted by sebaceous glands, not ceruminous glands. Sebum is an oily substance that lubricates and protects the hair and skin.

Choice C is wrong because mucus is secreted by mucous glands, not ceruminous glands. Mucus is a slippery substance that moistens and protects the inner lining of various organs.

Choice D is wrong because keratin is not a secretion, but a protein that forms the structure of hair, nails and skin.

This is because the anatomical position is a standard position that serves as a reference for the body. A person is said to be in anatomical position when they are standing erect with their feet together, their hands at their side, with the palms facing forward. Unless otherwise stated, most anatomical descriptions will refer to a person when in anatomical position.

Choice A is wrong because palms of the hand facing medially means that the palms are facing toward the midline of the body, which is not the case in anatomical position.

Choice B is wrong because palms of the hand facing laterally means that the palms are facing away from the midline of the body, which is also not the case in anatomical position.

Choice D is wrong because palms of the hands facing posteriorly means that the palms are facing toward the back of the body, which is opposite to the anatomical position.

The correct answer is choice D. Thrombocytes, also known as platelets, are tiny components of your blood that help with clotting. They are your body’s natural bandage to stop bleeding. When a blood vessel tears, thrombocytes stick together to form a clot, plugging the tear to stop bleeding.

Choice A is wrong because defending against infection is the function of white blood cells, not thrombocytes.

Choice B is wrong because transporting respiratory gases is the function of red blood cells, not thrombocytes.

Choice C is wrong because forming connective tissue is not the function of any blood cells, but of specialized cells called fibroblasts.

A normal platelet count for adults ranges from 150,000 to 450,000 platelets per microliter of blood. Any count above 450,000 or below 150,000 would be risk factors for platelet-related conditions.