HESI Biology Practice Test

Proteins are polymers composed of

What type of bond links amino acids together within the primary structure of a protein?

Which nucleotide base is found within DNA but not in RNA?

Glucose is a common monomer of

What is the type of bond between the O atom and each H atom within a water molecule called?

What property allows refers to the ability of water molecules to stick to each other?

Which statement describes the relationship between the densities of ice and liquid water?

What type of bond forms between water molecules that allows them to stick to each other?

Which cellular structure is found in a typical eukaryote but not in a prokaryote?

Which step of the scientific method occurs before the development of a hypothesis?

Which of the following is an example of an anabolic pathway?

What type of molecule are hormones like testosterone and estrogen?

What organelle of a eukaryotic cell is important for modifying proteins and then packaging them into membrane-bound vesicles for transport and secretion?

Which eukaryotic organelle digests foreign materials like viruses by phagocytosis?

Which statement best describes the hydrophobic part of a cell membrane?

Which organelle likely arose as a result of the endosymbiosis of a bacterium inside of a primitive eukaryotic cell?

Which molecule passes through the cell membrane by simple diffusion?

During cellular respiration, which process results in the degradation of acetyl-CoA to CO2?

How many net ATP molecules are made per glucose molecule during glycolysis?

Where is the electron transport chain located in a eukaryotic cell?

Which of the following is a product of photosynthesis?

Which type of organism is a prokaryote?

Which level of biological organization is the smallest unit of structure that is considered to be alive?

Which level of biological organization is the smallest unit that can evolve?

Which list has the levels of biological organization correctly ordered from smallest to largest?

During which photosynthetic process is CO₂ fixed into organic carbon?

During which phase of the eukaryotic cell cycle does DNA replication occur?

Consider the cell cycle. If a cell has 10 picograms of DNA during G2 phase, how much DNA does it have during G1 phase?

During which stage of meiosis does crossing over occur?

During which stage of meiosis does the separation of homologous chromosome pairs occur?

Which process do prokaryotes use for cell division?

Consider a cell undergoing meiosis. Which best describes the cells resulting from meiosis I?

How many pairs of autosomes do humans have?

If an individual heterozygous for a gene mates with an individual who is homozygous recessive for the same gene, what is the probability that their offspring will be homozygous recessive?

If the A allele is completely dominant to the a allele, which groups of genotypes will result in an individual having the dominant phenotype?

Cystic fibrosis is an autosomal recessive disease. If two individuals who do not suffer from cystic fibrosis but each carry the allele associated with the disease have children, what is the probability that they will have a child having cystic fibrosis?

Which term refers to an individual’s observable characteristics resulting from what genes it has as well as environmental influences?

If two individuals both having the genotype AaBb are crossed, what proportion of their offspring do you expect to have the dominant A phenotype combined with the recessive b phenotype?

What term refers to 2 chromosomes that have the same genes in the same order but not necessarily the same alleles of each gene?

Within a double-stranded DNA molecule, what type of bond links nucleotides within a strand of DNA to each other?

Within a double-stranded molecule of DNA, if 20% of the nucleotides contain A, what percentage of nucleotides contain C?

Where does transcription occur in a eukaryotic cell?

Which of the following is the chemical formula for a carbohydrate composed of 12 carbons?

Which type of atom is found in both proteins and nucleic acids, but not in fats or carbohydrates?

Which of the following is a DNA sequence that signals the initiation of transcription?

Which of the following molecules is involved in transcription but not in translation?

Which level of protein structure refers to the association of the various subunits of a multi-subunited protein into a three-dimensional functional protein?

Which molecule contains 3-nucleotide groupings called codons which each code for a specific amino acid?

Transcribe the following DNA template: 3′-TACGGTACCATG-5′

Which structure or enzyme complex is responsible for linking together nucleotides during the process of replication?