A Model Of A Dna Molecule Is Shown Below

Question: double helix structure of dna
Answer: In 1952 Rosalind Franklin took the x-ray photograph shown below, which gave the world its first look at DNA. By studying this photograph, scientists gained knowledge about the —
==================================================
Question: the hydrogen bond between complementary nucleotides
Answer: A model of a DNA molecule is shown below. The arrow indicates ? —
==================================================
Question: The DNA must be replicated
Answer: Which of these must occur during S phase of the cell cycle so that two daughter cells can be produced during M phase?
==================================================
Question: So that healthy daughter cells are produced, allowing the organism to continue growing
Answer: Cells pass through a G2 checkpoint before entering mitosis. Ideally, if DNA damage is detected, the cells do not enter mitosis until the damage is repaired. Why is DNA damage repaired before cells enter mitosis?
==================================================
Question: assimilation of external DNA into a cell
Answer: How is transformation in bacteria most accurately described?
==================================================
Question: mitosis
Answer: In which phase of the cell cycle does the nucleus divide through a series of steps?
==================================================

Answer: Each strand of a DNA molecule contains nitrogenous bases that pair with other nitrogenous bases in very specific ways. A diagram of a section of DNA is shown. 3'-TGTAGCTGCGCGT-5' Which strand shown below is complementary?
==================================================
Question: 8%
Answer: Cytosine makes up 42% of the nucleotides in a sample of DNA from an organism. Approximately what percentage of the nucleotides in this sample will be thymine?
==================================================
Question: cytokinesis
Answer: Division of the cytoplasm of cells is called ____________.
==================================================
Question: Watson, Crick & Franklin
Answer: The scientists who are credited with constructing the first 3D model of DNA is/are ___.
==================================================
Question: Cell division is unregulated
Answer: Oncogenes are mutated forms of genes. Oncogenes can transform a cell into a tumor cell. Some tumor cells are benign, while others are malignant. How does the presence of an oncogene lead to the formation of a tumor?
==================================================
Question: carcinogens
Answer: Agents that cause cancer are called ___.
==================================================
Question: nucleotides
Answer: DNA is a polymer found primarily in the nucleus of eukaryotic cells and the cytoplasm of prokarotyes. What are the monomers of DNA?
==================================================
Question: It helps separate the chromosomes
Answer: What is the role of the spindle during mitosis?
==================================================
Question: prophase, metaphase, anaphase, telophase
Answer: Which of the following represents the phases of mitosis in their proper sequence?
==================================================
Question: nitrogenous base
Answer: The weakest bonds in a double-stranded molecule of deoxyribonucleic acid exist between the
==================================================
Question: Mixing a heat-killed pathogenic strain of bacteria with a living nonpathogenic strain can convert some of the living cells into the pathogenic form.
Answer: In his transformation experiments, what did Griffith observe?
==================================================
Question: To unwind the DNA from the histones
Answer: What was the purpose of adding NaCl in the strawberry DNA extraction lab
==================================================
Question: A nitrogenous base
Answer: Four different nucleoties are used as building blocks of DNA. Which of the following can be used to distinguish one nucleotide from another?
==================================================
Question: centromeres
Answer: The sister chromatids are held together by _____.
==================================================
Question: Repeat the cell cycle continuously
Answer: When cells leave the cell cycle they exit during G1 phase and then enter G0 phase, a resting period. Most normal cells can leave G0 phase and reenter the cell cycle at G1 phase before entering S phase. Cancer cells are different because they cannot enter G0 phase and are likely to do which of the following.
==================================================
Question: somatic cells
Answer: non reproductive cells; have 2 sets of chromosomes
==================================================
Question: gametes
Answer: reproductive cells; have 1 set of chromosomes
==================================================
Question: centromere
Answer: pinched in region on a chromosome where spindle fibers attach that will pull the sister chromatids apart
==================================================
Question: mitosis
Answer: the division of the genetic material (nucleus) in the nucleus; 4 phases
==================================================
Question: pmat
Answer: prophase, metaphase, anaphase, telophase
==================================================
Question: prophase
Answer: - chromosomes start to appear
- nuclear membrane disappears
- centrioles migrate to opp. poles; as they migrate to the opp. sides, they spin a "web" called spindle fibers
==================================================
Question: metaphase
Answer: chromosomes line up in the middle of the cell
==================================================
Question: anaphase
Answer: sister chomatids are pulled apart
==================================================
Question: telophase
Answer: tell the chromosomes to stop moving; opp. of prophase
==================================================
Question: cleavage furrow
Answer: when the cell membrane starts to pinch in and get 2 distinct cells
==================================================