Blood with 90+ answers. The amount of blood in a human body varies, of course, with the size of that body. Over the range of sizes we usually encounter for average people, this is approximately 7% of body weight. And the density of whole blood, again on average, is about 1.06 grams/ml. So, for example, if a person weighs 185 lbs, in kilograms this converts to about 84 kg body size. Taking 7% of this gives 5.87 kg of blood. Since blood has a density 6% greater than water, this gives a total of 5.54 liters of blood, or 11.7 pints.
DNA replication occurs in the nucleus of almost every cell in the body, and replication takes place when hair or nails grow. Learn about DNA replication, which creates two identical cells, with information from a biology teacher in this free video on science. Part of the Video Series: DNA Structure & Testing.
B. DNA Replication in Bacteria. DNA Replication in Bacteria. In general, DNA is replicated by uncoiling of the helix, strand separation by breaking of the hydrogen bonds between the complementary strands, and synthesis of two new strands by complementary base pairing. Replication begins at a specific site in the DNA called the origin of replication (oriC). DNA replication is bidirectional from the origin of replication. To begin DNA replication, unwinding enzymes called DNA helicases cause short segments of the two parent DNA strands to unwind and separate from one another at the origin of replication to form two Y-shaped replication forks. These replication forks are the actual site of DNA copying (see Fig. 4).