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Why are cells from a blastula ideal to examine mitosis?
Unlike most cells in an adult body, an embryonic mass of cells is always dividing. Most cells in the adult body is quiscent and will not divide unless signals have been given to them to divide, and many cells such as muscle and nerve cells have even lost the ability to divide.
What is the advantage of 60 Hertzs over 50 Hertz?
The higher frequency allows for the use of less iron in transformers and motors, but at the cost of more losses in the distribution system. To add to the above, the 60 Hertz frequency was used for many years as a simple means to keep clocks, timers, synchronous motors and other frequency dependent devices at multiples or divisions of 60 cycles per second. Thus dividing by 60 gives seconds, and dividing that result by another 60 gives minutes, and again, another 60 gives hours.
Does GPS satellite have the same frequency with AIS?
GPS Satellites use two frequencies 1.57542 GHz and 1.2276 GHz. AIS operates in the Marine VHF band using channels 87B, 161.975 MHz and channel 88B, 162.025 MHz
Why would the cells need to go through exocytosis?
Many cells in the body use exocytosis to release enzymes or other proteins that act on other parts of the body or to release molecules that helps cells to communicate with each other.
What is a system of membrane channels called?
In the nervous system the system of membrane channels is called the neuroreceptors. Neurotransmitters use the neuroreceptors as binding sites.
Why do biologists use dividing cells to determine the number of chromosomes in an organism?
Biologists use dividing cells to determine the number of chromosomes in an organism because when cells go through mitosis (the process of dividing) the chromosomes become much more visible.
What does VDSL use to divide its upstream and downstream channels into subchannels?
Frequency division multiplexing (FDM)
What were frequency division multiplexers used for?
Their primary use was to connect multiple, slow-speed data terminals over voice channels
What is a use of radioactivity materials in medicine?
Mainly twofold: kills dividing cells, used to visualize internal body.
Why do plants use cotransporters instead of ion channels to transfer anions into cells?
because contransporters can transfer anions against the membrane potential gradient where as ion channels can only transfer from high consentrations to low consentrations
What is channels to be non-overlapping?
Broadcast media AND OTHER RF COMMUNICATION use electromagnetic waves to send information across distance. An AM radio can use a very narrow frequency to send the information, but FM communications, such as television, your FM radio receiver and most digital signals, use what is called "frequency modulation" to send a signal. In a frequency modulated signal, the base sigal will start at a single frequency. To send information, the signal changes (modulates) the frequency up and/or down from that base frequency. The FCC and other regulating agencies have reserved certain frequencies for specific commercial broadcast use only. A radio signal may not "overlap" or attempt to use the frequency or any part of the frequency that has been assigned to another commercial broadcaster.
What is the Concept of frequency reuse?
Frequency reuse is a technique of reusing frequencies and channels within a communications system to improve capacity and spectral　efficiency. Frequency reuse is one of the fundamental concepts on which commercial wireless systems are based that involves the partitioning of an RF radiating area (cell) into segments of a cell. One segment of the cell uses a frequency that is far enough away from the frequency in the bordering segment that it does not provide interference problems. Frequency re-use in mobile cellular systems means that each cell has a frequency that is far enough away from the frequency in the bordering cell that it does not provide interference problems. The same frequency is used at least two cells apart from each other. This practice enables cellular providers to have many times more customers for a given site license.
Why are cells from a blastula ideal to examine mitosis?
Unlike most cells in an adult body, an embryonic mass of cells is always dividing. Most cells in the adult body is quiscent and will not divide unless signals have been given to them to divide, and many cells such as muscle and nerve cells have even lost the ability to divide.
How do you use division?
by dividing
The cell junctions in plant cells that provide channels between adjacent cells are generally?
Plasmodesmata are the channels that traverse plant cell walls, which enables molecular exchange between the cells. They are analogous to gap junctions in animal cells. There are two forms of plasmodesmata: primary ones are formed during cell division and secondary ones can form between mature cells.Plasmodesmata provide a simple route for the movement of ions and macromolecules. Larger molecules use actin filaments to traverse the cells.
Why do uhf and vhf relate to television broadcasts?
Early television broadcasts were transmitted on VHF (very high frequency) radio channels. They moved to UHF (ultra high frequency) and have remained on that band since. These bands are used for terrestrial broadcasts. Satellite broadcasts use even higher frequencies.
How is interference avoided by using FDM?
Interference is avoided under frequency division multiplexing by the use of guard bands, which are unused portions of the frequency spectrum between subchannels. by abdullahi yusuf gedi
