DNA Structure and Function Assessment

The video provides a comprehensive overview of the double helix structure of DNA, covering its introduction, historical discovery, detailed structure, and chemical nature. It explains Chargaff's rules on base pairing and discusses the characteristics and functions of DNA, including replication, gene expression, and mutation. The video also highlights the forensic significance of DNA, emphasizing its role in identifying individuals and solving crimes.

What is the primary role of DNA in living organisms?

• To provide energy

• To carry genetic information

• To transport oxygen

• To digest food

Who first isolated DNA from cells?

• Erwin Chargaff

• Frederick Miescher

• Francis Crick

• James Watson

What did Watson and Crick contribute to the understanding of DNA?

• They isolated DNA from the nucleus

• They proposed the double helix model

• They discovered the X-ray diffraction pattern

• They identified DNA as the transforming principle

What are the four nitrogenous bases found in DNA?

• Adenine, Guanine, Uracil, Thymine

• Guanine, Uracil, Cytosine, Thymine

• Adenine, Uracil, Cytosine, Thymine

• Adenine, Guanine, Cytosine, Thymine

What type of bond holds the two strands of DNA together?

• Hydrogen bonds

• Covalent bonds

• Metallic bonds

• Ionic bonds

What is the chemical nature of DNA?

• Positively charged macromolecule

• Positively charged micromolecule

• Negatively charged macromolecule

• Neutral macromolecule

Which characteristic is essential for DNA to function as genetic material?

• It must be able to replicate faithfully

• It must be able to conduct electricity

• It must be soluble in water

• It must be visible under a microscope

Which process is NOT a function of DNA?

• Translation

• Transcription

• Photosynthesis

• Replication

How does DNA assist in forensic science?

• By transporting nutrients

• By providing energy to cells

• By aiding in digestion

• By identifying individuals through genetic material

What type of biological evidence can be used to identify DNA at a crime scene?

• Plastic bags

• Metal objects

• Plant leaves

• Hair samples