Answer:
A) repressors
Explanation:
A transcription factor is a protein that controls the rate of transcription of genetic information from DNA to messenger RNA, by binding to specific DNA sequence. The function of TFs is to regulate-turn on and off genes-In order to make sure that they are expressed in the right cell, at the right time and in the right amount throughout the life of the cell and the organism. Groups of TFs function in a coordinated fashion to direct cell division, cell growth and cell death throughout life.
Answer:
Meiosis results in gametes that are used in reproduction.
Explanation:
- <em>The sperm and egg have twice as many chromosomes as the parental cells</em>. INCORRECT. Sperm and eggs are the gametes, and they have only half the number of chromosomes that can be found in the germ cells or somatic cells. Gametes are haploid, n.
- <em>Geneticists use the terms "son" and "daughter" to distinguish between cells resulting from cell division</em>. INCORRECT. The term "daughter cells" is used to refer to the products of cell division. "son cells" is not used at all.
- <em>Meiosis results in gametes that are used in reproduction. </em>CORRECT. Germ cells are the reproductive, diploid cells produced by testes and ovaries. After meiosis, each germ cell produces four haploid cells that are the gametes. Gametes´ destiny is to merge during fecundation, creating a new diploid cell called the zygote. The zygote is a diploid cell that suffers successive mitosis to form the new organism.
- <em>Asexual reproduction requires the production of eggs and sperm. </em>INCORRECT. Only sexual reproduction needs gametes. Cells that reproduce asexually duplicate their genetic material and cytoplasmic content and then divide, producing a new cell identical to its parental. This is the case of binary fission, for example.
Chloroplast is the same as solar cell ! because it traps energy of the sun and helps in formation of food , made by plant !
Answer:
1. DNA
2. RNA
3. Nucleus
4. Nuclear membrane
5. Nuclear pore
6. Nucleolus
7. Chromatin
Explanation:
DNA is present in nearly all living organisms. It has the capacity to replicate itself and also the capacity to be transcribed into RNA. The latter contains the genetic codes that are usually translated during protein synthesis.
The nucleus is the most prominent, membrane-bound (nuclear membrane) organelle in the eukaryotic cell. The nuclear membrane has a special pore, the nuclear pore, through which molecules can be transported between the nucleus and the cytoplasm.
Within the nucleus is the nucleolus, a spherical structure whose primary function is to make ribosomal subunits. The genetic materials in the nucleus are in the form of chromatin, a decondensed protein-DNA complex.
