Mitosis is the step during which the cell’s nucleus divides into two new nuclei. During mitosis, one copy of the DNA is distributed into each of the two daughter cells. Scientists divide mitosis into four parts (phases): prophase, metaphase, anaphase, and telophase. During prophase, the thread-like chromatin in the nucleus condenses to form double-rod structures called chromosomes. During metaphase, the chromosomes line up across the center of the cell.
Which of the following planets is NOT a gas giant? a. Earth b. Jupiter c. Saturn d. Uranus 16. The sun gets its energy from a. burning fuel b. nuclear fusion c. shrinking due to gravity d. convection 17. The number of on any planet can be used to estimate how old the surface is.
Process of Protein Synthesis How does DNA, through the process of protein synthesis responsible for the ultimate expression of the characteristics in the organism. An embryonic cell divides again and again. Where there is one cell, there are two, then four, then eight. Each holds all the genetic information needed to create a human being. Then how, exactly, do these cells make copies of themselves?
How old is the earth compared to the universe itself? | 5. The earth is the 3rd planet from the Sun. 6. The closest star to the Sun was thought to be Alpha Centauri but Alpha Centauri is a system of three stars Centauri A, Centauri B, and Proxima Centauri.
Which of the following is not a fundamental idea of cell theory? | | | A) | All organisms contain prokaryotic cells. | | | B) | Cells arise only from previously existing cells. | | | C) | Cells are the basic unit of structure for all living organisms. | | | D) | All living organisms are composed of one or more cells.
The process involves meiosis – having the exact number of chromosomes from both parents (23 from each). It also includes fertilization which fuses two of the gametes and the restoration of the original number. When meiosis occurs the chromosomes of each pair crosses over to create homologous pairs. Most animals (including humans) and plants reproduce sexually. Sexually reproducing organisms have two sets of genes for every trait (called alleles).