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When are drugs tested on humans?
After clinical animal trials at: Phase 1 - small group of healthy volunteers are tested
What phase of mitosis in animal cell is least amount of time?
t phase
What will humans need to do on earth to survive when the sun begins to enter the red ginat phase?
Humans will need to leave Earth in order to survive when the Sun begins to enter the giant phase.
Animal cells begin to pinch in what phase of mitosis?
prophase
How many chromosomes enter the G2 Phase?
Cells in G2 phase have a diploid set of chromosomes, which is twice the number found in gametes (haploid cells). In humans, this means that 46 chromosomes enter G2 phase.
Can humans make cars with there body?
Humans cannot physically turn their bodies into cars, but do utilize parts of their bodies during the construction phase of an automobile.
What happens to animal cytoplasm in the m-phase?
During the M phase (mitosis or meiosis), the animal cell's cytoplasm undergoes a process called cytokinesis where it divides into two daughter cells. This division ensures each daughter cell receives a complete set of organelles and cytoplasmic components.
Why do humans not go through alternation of generations?
Human beings do exhibit an alternation of generations, but the haploid phase is extremely deemphasized while the diploid phase is overwhelmingly dominant. The haploid phase in humans that results from meiosis is restricted to only one cell, either an egg in the female or a sperm in the male. There is never a multicellular haploid structure as there usually are in plants. If such a multicellular haploid structure is required for a true alternation of generations, then humans do not exhibit alternation of generations. The human organism grows by mitosis (the diploid phase) only after fertilization. A plant sporophyte is diploid and it produces spores by meiosis. Humans, like plant sporophytes, are diploid and make haploid gametes by meiosis.
What phase of evolution was the ozone created?
Ozone was created long ago. It was due to this fact humans were able to develop.
Occurs in the cytoplasm of animal cells during m-phase?
Mitosis occurs in the cytoplasm of animal cells during the M-phase of the cell cycle. This is when the cell divides its nucleus into two identical daughter nuclei. Mitosis is essential for growth, repair, and maintenance of multicellular organisms.
Why are new drugs tested before they can be used?
A new drug is tested on healthy volunteers first (in what are called Phase 1 clinical trials) to determine if the drug is safe to give to humans. The drug company has already done extensive testing in cell cultures, tissue cultures, computer modeling and animal testing and is relatively sure that the drug is not dangerous, but cannot be sure until humans have taken the drug. In Phase 2 clinical trials, people who are ill with the disease the drug is trying to cure or treat take it, again to test safety and also to get an idea of what the dosing should be, if there appears to be any benefit from the drug and what side effects there may be. Phase 3 clinical trials are when a large number of people take the drug to see if it actually works; safety and dosage have already been determined.
What is the difference between estrus and estrous cycle?
The estrous cycle is the cycle of a non-pregnant female mammal that goes through a luteal phase and a follicular phase. Estrus is the period in which an animal will stand to be bred, and is part of the follicular phase of the estrous cycle. An easy way to remember it is that estrous is an adjective and estrus is a noun. Thus, estrous refers to the entire cycle, whereas estrus just refers to the phase in which the animal can get pregnant. Usage: The female chimpanzee can get pregnant because she is in estrus. The female chimpanzee can get pregnant in this phase of her estrous cycle.
