Hesi A2_BIOLOGY

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Free Hesi A2_BIOLOGY Questions

1.

On what part of a light microscope is the slide placed?

  • Base​

  • Arm​

  • Lens​

  • Stage

Explanation

The stage is the flat platform on a microscope where the slide is placed for viewing. It typically contains clips or a mechanical holder to secure the slide and may include stage controls for precise movement. The stage positions the specimen directly under the objective lenses for proper magnification and examination.

2.

What is the first step in the process of respiration?

  • Fermentation​

  • Electron transport chain​

  • Glycolysis​

  • Krebs cycle

Explanation

Glycolysis is the first step in cellular respiration. It occurs in the cytoplasm and breaks down glucose into two molecules of pyruvate, producing a small amount of ATP and NADH. This process does not require oxygen, making it essential for both aerobic and anaerobic respiration. The products of glycolysis then enter the mitochondria for further stages of respiration if oxygen is present.

3.

What is the purpose of cellular respiration?

  • Produce enzymes​

  • Obtain energy in the form of ATP​

  • Enable fermentation​

  • Produce oxygen molecules

Explanation

The primary purpose of cellular respiration is to extract energy from glucose and convert it into ATP (adenosine triphosphate), the usable energy currency for cells. This process occurs in the mitochondria and is essential for powering cellular activities such as muscle contraction, active transport, and biosynthesis. ATP production enables cells to function, grow, and maintain homeostasis.

4.

Which genetic descriptor refers to an organism's actual appearance?

  • Karyotype​

  • Phenotype​

  • Genotype​

  • Homozygote

Explanation

A phenotype refers to the observable traits or characteristics of an organism, such as eye color, height, or flower color. These physical or biochemical traits result from the interaction between the organism’s genes (genotype) and its environment. Phenotype reflects how genetic information is expressed in real life.

5.

What does the mitochondrion produce that causes it to often be called the powerhouse of the cell?

  • Proteins​

  • ATP​

  • Enzymes​

  • DNA

Explanation

The mitochondrion produces ATP (adenosine triphosphate), the primary energy molecule used by cells to power essential functions such as movement, growth, repair, and active transport. Because ATP production occurs mainly in mitochondria through aerobic respiration, they are commonly referred to as the “powerhouse of the cell.”

6.

Which cell organelle can be functionally compared to the door of a house?

  • Cytoplasm​

  • Cell membrane​

  • Endoplasmic reticulum​

  • Nucleus

Explanation

The cell membrane functions like a door because it regulates what enters and leaves the cell. It acts as a selective barrier, allowing essential nutrients to enter, waste products to exit, and maintaining internal balance. Its semi-permeable nature ensures the cell only allows necessary substances through, similar to how a door controls access to a house.

7.

Which term means alternate forms of a gene for the same trait?

  • Genotypes​

  • Phenotypes​

  • Gametes​

  • Alleles

Explanation

Alleles are alternate forms of the same gene that occupy the same position (locus) on homologous chromosomes. They encode different versions of a trait—for example, brown vs. blue eye color. An individual inherits one allele from each parent, and the combination determines expression of that trait.

8.

Aerobic respiration occurs in the presence of what necessary molecule?

  • Carbon dioxide​

  • Lactic acid​

  • Oxygen​

  • Water

Explanation

Oxygen is required for aerobic respiration, a process that occurs in the mitochondria and produces large amounts of ATP by fully breaking down glucose. Oxygen acts as the final electron acceptor in the electron transport chain, allowing efficient generation of energy. Without oxygen, cells must switch to anaerobic pathways, which yield far less ATP.

9.

If the zygomatic arch is broken, where is the fracture located?

  • Knee​

  • Shoulder​

  • Face​

  • Wrist

Explanation

The zygomatic arch is a bony arch in the face formed by the zygomatic bone (cheekbone) and a portion of the temporal bone. It provides structure to the cheek and forms part of the eye socket. A fracture here results in facial trauma and can affect appearance, jaw movement, and vision depending on severity.

10.

Each species has a characteristic chromosome number and most of their cells have a complete set of these chromosomes. However, in the life cycle of humans, only sperm and eggs have which number of chromosomes?

  • Polyploid​

  • Haploid​

  • Monoploid​

  • Diploid

Explanation

Human sperm and egg cells are haploid, meaning they contain half the normal number of chromosomes—23 instead of 46. During fertilization, the haploid sperm and haploid egg fuse to form a diploid zygote with 46 chromosomes, restoring the complete chromosome number for normal human development.

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