What is the basic structural unit of DNA?
Master all 25 flashcards
Mastering this deck enables you to understand how genetic information is stored and transmitted at the molecular level, providing a foundation for fields like genetics, biotechnology, and medicine. This knowledge enhances your ability to interpret genetic data and comprehend mechanisms of heredity and mutation.
Showing 20 of 25 cardsSample view
| # | Front | Back | Hint |
|---|---|---|---|
| 1 | What is the basic structural unit of DNA? |
Master all 25 flashcards
Explore other decks you might find helpful
Learn the fundamental structure of DNA, nucleotide composition, and its role in storing genetic information.
The basic structural unit of DNA is a nucleotide, which consists of a sugar (deoxyribose), a phosphate group, and a nitrogenous base. |
| Think of DNA as a long chain of building blocks. |
| 2 | What are the four types of nitrogenous bases found in DNA? | The four nitrogenous bases are adenine (A), thymine (T), cytosine (C), and guanine (G). | Remember: A with T, and C with G, pairing rules. |
| 3 | How are the two strands of DNA oriented relative to each other? | DNA strands are antiparallel, meaning they run in opposite directions: one 5' to 3', the other 3' to 5'. | Think of two lanes running in opposite directions on a highway. |
| 4 | What type of bond holds the bases together in the interior of the DNA double helix? | Hydrogen bonds hold the complementary bases together: adenine pairs with thymine via two hydrogen bonds, and cytosine pairs with guanine via three hydrogen bonds. | Think of hydrogen bonds as the 'glue' between bases. |
| 5 | What is the overall shape of the DNA molecule? | DNA has a double helix structure, resembling a twisted ladder. | Imagine a spiraled ladder or a twisted staircase. |
| 6 | What is the significance of the sugar-phosphate backbone in DNA? | The sugar-phosphate backbone provides structural stability and forms the sides of the DNA double helix, supporting the nucleotide bases inside. | Think of the backbone as the framework of a building. |
| 7 | Which component of DNA determines the genetic information carried? | The sequence of nitrogenous bases (A, T, C, G) encodes genetic information. | Bases are the 'letters' of the genetic alphabet. |
| 8 | How does the sequence of bases in DNA relate to genes? | Genes are specific sequences of bases that encode instructions for making proteins. | Think of genes as sentences in a book made up of nucleotide 'letters.' |
| 9 | What is the complementary strand of the DNA sequence 5'-ATGCCG-3'? | The complementary strand is 3'-TACGGC-5'. | Remember base pairing: A with T, C with G. |
| 10 | What is the role of DNA in cells? | DNA stores genetic information and directs cellular activities by coding for proteins. | DNA is the cell's instruction manual. |
| 11 | What is the difference between purines and pyrimidines in DNA? | Purines are adenine and guanine, larger bases with two rings; pyrimidines are thymine and cytosine, smaller bases with one ring. | Think of purines as 'large' and pyrimidines as 'small' bases. |
| 12 | Why is the antiparallel orientation of DNA strands important? | Antiparallel orientation allows proper base pairing and enables enzymes like DNA polymerase to synthesize DNA efficiently. | Think of two lanes of a highway running in opposite directions for proper traffic flow. |
| 13 | What structural feature allows DNA to be tightly packed in chromosomes? | DNA wraps around histone proteins forming nucleosomes, which further fold into higher-order chromatin structures. | Think of DNA as thread wound around spools. |
| 14 | What is the significance of hydrogen bonds in DNA stability? | Hydrogen bonds stabilize the double helix by holding complementary bases together without making the structure too rigid, allowing for replication and transcription. | Hydrogen bonds are like flexible glue holding the bases. |
| 15 | What is meant by the term 'genetic code' in DNA? | The genetic code refers to the sequence of bases in DNA that determines the amino acid sequence in proteins. | Think of it as the 'language' of genes. |
| 16 | How does the structure of DNA facilitate its replication? | The complementary, antiparallel strands allow each strand to serve as a template for copying during replication. | DNA's structure acts like a zipper that can be unzipped for copying. |
| 17 | What is the role of the enzyme DNA polymerase? | DNA polymerase synthesizes a new DNA strand by adding nucleotides complementary to the template strand during replication. | Think of DNA polymerase as the 'copying machine' of DNA. |
| 18 | Which part of the nucleotide is variable and determines genetic diversity? | The nitrogenous base (A, T, C, G) varies and encodes genetic information, contributing to genetic diversity. | Bases are the 'letters' that differ in each gene. |
| 19 | What is the significance of the 5' and 3' ends in DNA? | The 5' and 3' ends denote the directionality of the DNA strand, essential for DNA replication and transcription processes. | Think of '5 prime' and '3 prime' as the 'start' and 'end' markers of a strand. |
| 20 | In which cellular organelle is DNA primarily located in eukaryotic cells? | DNA is primarily located in the nucleus, packaged into chromosomes. | Think of the nucleus as the 'library' of genetic information. |
Note: This preview shows only the first 20 cards. The complete deck contains 25 total cards. Start studying to access all flashcards.