CHROMOSOMES, GENES & DNA

1. What is the relationship among DNA, a gene, and a chromosome? A chromosome contains hundreds of genes, which are composed of DNA. A gene contains hundreds of chromosomes, which are composed of protein. A gene is composed of DNA, but there is no relationship to a chromosome. A gene contains hundreds of chromosomes, which are composed of DNA. 2. How many pairs of chromosomes do humans have? 12 23 24 46 3. In what part of the cell are chromosomes found? cell wall cel membrane cytoplasm nucleus 4. What are the thread-like structures present in a tangled form in a regular active cell? chromatins chromatids chromosomes centromeres 5. Condensation of the tangled threads produce rod-shaped structures called _. chromatins chromatids chromosomes centromeres 6. Chromosomes are seen only during _. cell division cell death cell regeneration cell repair 7. What are the macromolecules that make up genes? proteins DNA chromosomes ribosomes 8. What scientist is best known for her role in the discovery of the structure of DNA, and for her pioneering use of X-ray diffraction? Maurice Wilkins James Watson Francis Crick Rosalind Franklin 9. What three scientists shared the Nobel Prize for their discovery of the DNA's double helix structure? Francis Crick, James Watson, and Rosalind Franklin James Watson, Maurice Wilkins, and Rosalind Franklin Francis Crick, James Watson and Maurice Wilkins Francis Crick, Rosalind Franklin, and James Watson 10. What are the three major components of DNA? deoxyribose, phosphate group, nitrogenous bases nitrates, amines, phosphates ribose, phosphate, nitrates oxygen, phosphorous, nitrogen 11.What are the four nitrogenous bases? thymine, riboflavin, cytosine, adenine guanine, adenine, cytosine, thymine valine, leucie, glycine, proline cysteine, methionine, isoleucine, threonine 12. Which of the following statements is correct? Guanine binds only with cytosine and adenine with thymine. Guanine binds only with thymine and adenine with cytosine. Threonine binds only with methionine and leucine with valine. Threonine binds only with valine and methionine with leucine. 13. What is a nucleotide? deoxyribose sugar + nitrogenous base deoxyribose sugar + nitrogenous base + phosphate molecule deoxyribose sugar + phosphate molecule nitrogenous base + phosphate molecule 14. What is the diameter of the double helix? 2 mm 2 cm 2 pm 2 nm 15. How many nitrogeneous bases are there in one turn of the double helix? 4 6 8 10 16. The double helix is naturally _. neutral acidic basic salty 17. What is approximnately the length of a DNA molecule? 2 cm 2 m 2 dam 2 hm 18. What name is given to special proteins that help the long strand of DNA coil inside the nucleus? prestone histone cystone none of these 19. What is a nucleosome? a section of DNA wrapped around a core of proteins a compound consisting of a nucleoside linked to a phosphate group a compound commonly found in DNA consisting of nitrogenous base linked to a sugar a strip of DNA wrapped around deoxyribose sugar 20. What are chromatins made up of? sugar + histones DNA + histones genes + histones chromosmes + histones