TEAS DNA, RNA & Protein Synthesis Practice Questions

5 free DNA, RNA & Protein Synthesis practice questions

Pick an answer and check it to see the full step-by-step explanation.

1. Question 1
   A nurse is reviewing a diagram of DNA packaging in a human cell nucleus. Which structure is the basic repeating unit of chromatin that helps compact DNA while still allowing regulated gene expression?

   A codon sequence on mRNA that determines an amino acidA phospholipid bilayer that forms the nuclear envelopeA nucleosome made of DNA wrapped around histone proteinsA centriole pair that organizes the mitotic spindle

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2. Question 2
   A lab technician compares nuclei from cells in different conditions. In which situation is DNA most likely organized as distinct, visible chromosomes rather than as diffuse chromatin?

   A cell in prophase of mitosis preparing to separate genetic materialA cell actively synthesizing proteins with high levels of gene transcriptionA cell in G1 phase carrying out routine metabolic functionsA cell using DNA as a template for RNA during interphase

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3. Question 3
   A student examines a dividing human cell under a microscope and notes that the DNA appears as distinct rod-like structures rather than a diffuse material. Which statement best explains the functional advantage of this change in DNA organization?

   It allows ribosomes to attach directly to DNA to begin protein synthesisIt converts RNA into DNA so the genome can be duplicated more quicklyIt prevents tangling and helps ensure accurate separation of genetic material into daughter cellsIt increases transcription by loosening DNA so RNA polymerase can bind more easily

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4. Question 4
   A nursing student is reviewing why DNA must be packaged inside the nucleus. Which statement best explains how chromatin organization supports normal cell function?

   It prevents any genes from being expressed until the cell enters mitosisIt converts DNA into RNA so proteins can be produced in the cytoplasmIt allows long DNA molecules to fit in the nucleus while still permitting regulated access for transcription and replicationIt ensures each chromosome contains only one copy of DNA at all times

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5. Question 5
   A student is learning how DNA is packaged in the nucleus. Which interaction most directly stabilizes DNA as it wraps around histone proteins in chromatin?

   Hydrogen bonding between complementary nitrogenous basesCovalent bonding between DNA and histone proteins to form a continuous backboneIonic attraction between negatively charged DNA phosphate groups and positively charged histone tailsHydrophobic interactions between DNA and histones that exclude water

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