Question 1

A patient is lying on an examination table with their palms facing forward and feet slightly apart. Which term best describes this position, and why is it important in anatomical terminology?

Accepted Answer

Anatomical position; it provides a standard reference for describing body parts and directions.

Question 2

Which of the following best illustrates a negative feedback mechanism in the human body?

Accepted Answer

Regulation of blood glucose: insulin lowers blood sugar when it rises above normal.

Question 3

Which statement correctly describes the subatomic particles of an atom?

Accepted Answer

Protons and neutrons are found in the nucleus, while electrons orbit the nucleus.

Question 4

Which four elements make up approximately 96% of the human body’s mass?

Accepted Answer

Oxygen, carbon, hydrogen, and nitrogen

Question 5

A sodium atom ($$\mathrm{Na}) $$donates an electron to a chlorine atom ($$\mathrm{Cl}$$), resulting in the formation of $$\mathrm{Na^+}$$ and $$\mathrm{Cl^-}. $$What type of bond is formed between these two ions?

Accepted Answer

Ionic bond

Question 6

Which of the following best describes a hydrogen bond?

Accepted Answer

A weak attraction between a hydrogen atom covalently bonded to an electronegative atom and another electronegative atom.

Question 7

Which of the following is an example of an organic compound, and why?

Accepted Answer

Glucose ($$\mathrm{C_6H_{12}O_6$}$$); it contains carbon and is typically found in living organisms.

Question 8

A laboratory experiment involves mixing oil and water. The oil forms a separate layer on top of the water. Which property of oil explains this behavior?

Accepted Answer

Oil is hydrophobic and does not interact with water.

Question 9

Which of the following best describes the building blocks and primary function of carbohydrates in the human body?

Accepted Answer

Monosaccharides; serve as a major source of energy.

Question 10

A patient is diagnosed with a disorder affecting the structure of their cell membranes. Which class of biomolecules is most likely involved, and what is their general structure?

Accepted Answer

Lipids; composed of glycerol and fatty acids.

Question 11

Which of the following statements about proteins is correct?

Accepted Answer

Proteins are made of amino acids and perform a wide variety of functions, including catalysis and transport.

Question 12

A protein loses its three-dimensional structure after being exposed to high heat. What is this process called, and what is its main consequence?

Accepted Answer

Denaturation; the protein loses its function.

Question 13

Which of the following best compares DNA and RNA?

Accepted Answer

DNA is double-stranded and contains thymine; RNA is single-stranded and contains uracil.

Question 14

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP provides energy for cellular processes by releasing a phosphate group.

Question 15

A scientist is studying a molecule with the following structure: a central carbon atom bonded to an amino group ($$\mathrm{-NH_2$}$$), a carboxyl group ($$\mathrm{-COOH}$$), a hydrogen atom, and a variable R group. What type of molecule is this, and what is its biological significance?

Accepted Answer

Amino acid; serves as the building block of proteins.

Question 16

Which of the following scenarios best demonstrates the application of positive feedback in the human body?

Accepted Answer

Amplification of uterine contractions during labor.

Question 17

A patient is found to have a mutation that disrupts the secondary structure of a protein. Which type of bond is most likely affected, and what is the consequence?

Accepted Answer

Hydrogen bonds; the protein will lose its alpha-helix and beta-sheet formations.

Question 18

Which of the following best explains why water is considered a polar molecule?

Accepted Answer

The oxygen atom is more electronegative, creating a partial negative charge, while the hydrogen atoms have a partial positive charge.

Question 19

A student mixes table salt ($$\mathrm{NaCl}) in $$water and observes that it dissolves completely. Which property of water allows it to dissolve ionic compounds so effectively?

Accepted Answer

Water forms hydrogen bonds with ions, surrounding and separating them.

Question 20

A marathon runner relies on stored glycogen during a race. Which type of biomolecule is glycogen, and what is its primary function?

Accepted Answer

Carbohydrate; stores energy for rapid release.

Study Notes: Human Body Orientation & Basic Chemistry for ANP

Study Guide - Practice Questions

Study Guide - Flashcards