HESI A2 BIOLOGY QUESTIONS AND ANSWERS.
In the hierarchic system of classification, which of the following is the least inclusive? Species
After ob... [Show More] serving an event, you develop an explanation. This statement is referred to as which of the following?
Hypothesis
A molecule of water is bonded with another molecule of water by what type of bond? Hydrogen
Which of the following is a benefit of the intermolecular hydrogn bonding of water?
Water has a relatively high specific heat value
Water has strong cohesive and adhesive properties
Polarity of water allows it to act as a versatile solvent
Of all the molecules that are significant to biology, which of the following are considered the most important?
Carbohydrates, lipids, protein, and nucleic acids
Lipids are better known as fats, but what are they specifically?
Fatty acids
Phospholipids
Steroids
What are the two categories of fatty acids?
Saturated fats and unsaturated fats
How do phospholipids function in cells?
They are integral components of the plasma membrane
Which of the biologic molecules are considered the most significant contributor to cellular function?
Proteins
Proteins are polymers of which of the following?
Amino acids
Which of the following proteins catalyze different reactions or processes?
Enzyme
Which of the biologic molecules are components of the molecules of inheritance? Nucleic acids
What is the sum of all chemical reactions that occur in an organism?
Metabolism
In a cell, reactions take place in a series of steps called:
Metabolic pathways
What is the fundamental unit of biology?
Cell
Which type of cell contains no defined nucleus?
Prokaryotic cell
What is the primary purpose of the flagella on the surface of cells?
Movement of the cell
Which cell organelle functions to transport materials from the endoplasmic reticulum throughout the cell?
Golgi apparatus
Which of the following are the distinct organelles that produce cell energy? Mitochondrion and chloroplast
Which component of the cell contributes to the protection, communication, and passage of substances into and out of the cell?
Cell membrane
The cell membrane consists of a bilayer of phospholipids with proteins, cholesterol, and glycoproteins. This bilayer creates a hydrophobic region between two layers of lipids, making it which of the following?
Selectively permeable
What are the two catabolic pathways that lead to cellular energy production? Fermentation and cellular respiration
What is the first step in the conversion of glucose to pyruvate?
Glycolysis
Which step in cellular respiration yields the greatest amount of ATP?
Electron Transport Chain
During cell respiration, the conversion of glucose results in an overall production of how many ATP molecules?
32-36
What is the function of water in photosynthesis?
Supply electrons in the light reactions
Cells reproduce by different processes, all of which fall into what two categories? Sexual reproduction and asexual reproduction
Which of the following describes how a bacterium reproduces?
Binary fission
Regarding mitosis and cytokinesis, one difference between higher plants and animals is that in plants:
A cell plate begins to form at telophase, whereas in animals a cleavage furrow is initiated at that stage
During which phase of cell reproduction does the cell divide forming two separate identical cells?
Cytokinesis
How does meiosis differ from mitosis?
In meiosis, each of the daughter cells contains half as many chromosomes as the parent
At which phase of meiosis does crossing over occur?
Prophase 1
A cell division occurs in a human. The resulting cells contain 23 chromosomes. This is a description of gametes formed by which process?
Meiosis [Show Less]
