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How is DNA different from chromosomes and genes?
chromosomes are thread like structures which contain the hereditary material i.e; genes on it.
Are genes a length of DNA?
Yes, a gene is a complex length of DNA that is in our body. A gene is a length of DNA that codes for a living life form. Genes are found on chromosomes which are in the body nucleus.
Which of the following statements regarding cDNA libraries is false?
a. They are usually double stranded DNA. b. They are composed of DNA synthesized with the use of reverse transcriptase. c. They are composed of DNA synthesized from an mRNA template. d. They contain introns and exons. e. They contain DNA that is complementary to the mRNA from which it was synthesized.
How is a cell's DNA like books in a library?
Supposes a small town has a library with a few thousand book. If more people move into town, the town will get larger. There will be more people borrowing books, amd sometimes people may have to wait to borrow popular titles. Similarly, a larger cell would have to make greater demands on its available genetic "library." In time, the cell's DNA would no longer be able to serve its increasing needs of the growing cell.
Is it true that the Nazi Germany scientists pioneered DNA research?
No, this is completely false. Scientists all over the world, including a German scientist (but not a Nazi), have made notable contributions to DNA research; here are the most cited milestones.The history of genetics begins in 1857, in the former country of Moravia, historically part of Czechoslovakia, and part of the Czech Republic today. Gregor Mendel, a Roman Catholic monk, mathematician, and biologist, is called the "Father of Genetics" for his experiments with plants.Twelve years later, in 1869, Swiss biochemist Friedrich Miescher, identified DNA as a substance and called it, "nuclein." He eventually isolated a pure sample from salmon sperm. In 1879, German biologist Walther Flemming observed cell division and the thread-like chromosomes in cell nuclei that house DNA. In 1889, Dr. Miescher's Swiss student, Richard Altmann, renamed nuclein "nucleic acid."In 1928, British bacteriologist Frederick Griffith's experiments with mice and pneumonia viruses led him to postulate that this molecule could pass on characteristics. And the following year, Lithuanian-American biochemist Phoebus Levene, working at the Rockefeller Institute in the United States, showed in what order DNA parts link, and coined the term, "nucleotide." Levene had studied with the Russian chemist and composer, Alexander Borodin, building on their joint scientific work. And in 1944 the Rockefeller Institute reported the results of the Avery-MacLeod-McCarty experiment. Oswald Avery, Colin MacLeod, and Maclyn McCarty had shown that DNA is the substance causing bacterial transformation, and not protein as was widely believed at the time.But scientists didn't know much about the molecular structure of any substance, DNA included, until the 1950's.Linus Pauling of the United States, who was the world's leading structural biochemist in 1950, also believed genes were made of protein. In 1951 Dr. Pauling became known as the founder of molecular biology when he published his discoveries that proteins are spiral (helix) structures (Taton, 1964). Pauling's work made it possible for geneticists to crack the DNA code of all organisms and begin to develop techniques to help prevent the inheritance of genetic disorders.In 1953, building on Pauling's work, two teams of scientists, US zoologist James Watson working with British molecular biologist Francis Crick at Cambridge, and New Zealand biophysicist Maurice Wilkins, working at King's College London with British chemist Rosalind Franklin, concurrently figured out that the DNA molecule is a double helix structure, or two chains twisted around each other. The four scientists announced the structure of DNA in articles that appeared together in the same issue of Nature.DNA (deoxyribonucleic acid), carries genetic information. It is dubbed the blueprint for life as it holds the recipe for making all living things. It is a self-replicating material and the main constituent of chromosomes.
Is genes are larger than chromosomes true or false?
False. Chromosomes are larger than genes. Chromosomes are structures within cells that contain many genes, which are segments of DNA that code for specific traits or functions. In essence, chromosomes are made up of DNA, which includes multiple genes along their length.
Crossing-over is the exchange of reciprocal segments of DNA between homologous chromosomes true or false?
It's true that crossing over is the exchange of reciprocal DNA parts between homologous chromosomes.
True or false In eukaryotic chromosomes DNA replication begins at a single point in the chromosome and proceeds in two direction?
It's true, it's in the book
Is iit true or false that our sex cells have the same amount of dna in as your heart cells?
That is false. All body cells, including heart muscle cells have 46 chromosomes. Sex cells have 23 chromosomes.
Genes on chromosomes are the units of inheritance. true or false?
True. Genes are specific sequences of DNA located on chromosomes that contain the instructions for building proteins, which ultimately determine an organism's traits. These genes are passed down from one generation to the next, making them the units of inheritance.
Is it True or false that chromosomes which carry genes are found in the nucleus of the cell?
True. Mitochondria contain their own DNA - and the chromosomes present in mitochondria are much smaller than those found in the nucleus (they are much more similar to Prokaryotic chromosomes). Mitochondrial DNA is not involved in the central processes of the cell.
If the DNA duplicates do the chromosomes duplicate?
True
Genes are arranged on twisted strands called what?
Genes are arranged on twisted strands called DNA. DNA is housed in the nucleus and controls the cells functions and systems.
How is DNA arranged in the human genome and why 24?
DNA in the human genome is arranged into 24 distinct chromosomes. It is because of DNA's natural structure. DNA is composed of nucleic acids and it looks like a twisted ladder or a double helix.
If DNA duplicates the chromosomes do not necessarily duplicate.?
True
True or false all DNA codes for protein?
true
True or False The nucleus contains very little of the cells DNA?
No - quite the opposite. The nucleus is where almost all of the DNA in a cell is found. Small amounts are also found in some organelles, such as mitochondria - and this is the only form of DNA found outside the nucleus.
