Introduction To Biology University Of The People (Biol1301)
University of the People
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THE RESPIRATORY SYSTEM
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---295septiembre 20232022/2023
- Breathing is an involuntary event. How often a breath is taken and how much air is inhaled or exhaled are tightly regulated 
by the respiratory center in the brain. Humans, when they aren’t exerting themselves, breathe approximately 15 times per 
minute on average. Canines, like the dog in Figure 39.1, have a respiratory rate of about 15–30 breaths per minute. With 
every inhalation, air fills the lungs, and with every exhalation, air rushes back out. That air is doing more than just inflati...
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MEIOSIS AND SEXUAL REPRODUCTION
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---242septiembre 20232022/2023
- The ability to reproduce in kind is a basic characteristic of all living things. In kind means that the offspring of any organism 
closely resemble their parent or parents. Hippopotamuses give birth to hippopotamus calves, Joshua trees produce seeds 
from which Joshua tree seedlings emerge, and adult flamingos lay eggs that hatch into flamingo chicks. In kind does not 
generally mean exactly the same. Whereas many unicellular organisms and a few multicellular organisms can produce 
genetically i...
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VIRUSES
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---299septiembre 20232022/2023
- No one knows exactly when viruses emerged or from where they came, since viruses do not leave historical footprints such 
as fossils. Modern viruses are thought to be a mosaic of bits and pieces of nucleic acids picked up from various sources 
along their respective evolutionary paths. Viruses are acellular, parasitic entities that are not classified within any kingdom. 
Unlike most living organisms, viruses are not cells and cannot divide. Instead, they infect a host cell and use the host’s 
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Written assignment
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---2septiembre 20232022/2023C
- Structure: according to National Library of Medicine (2022) Cimetidine is a histamine type 2 receptor antagonist (H2 blocker) which is widely used for treatment of acid peptic disease and heartburn. Cimetidine has been linked to rare instances of clinical apparent acute liver injury. It enhances anti-tumor cell-mediated responses, cimetidine blocks histamines ability to stimulate suppressor T lymphoccyt6e activity and to inhibit natural killer (NK) cell activity and interleukin-2 production. Acc...
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Discussion Assignments Unit 5
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---2septiembre 20232022/2023
- Eukaryotes: The cell of a eukaryote has several membrane-bound structures dispersed in the cytoplasm. They are called organelles. Organelles are different functioning part of cells that enables it survival, replication and energy storage. Prokaryotes: Prokaryotes are unicellular organisms that lack a well-defined nucleus (biology online, 2021). The nucleus of a cell we know have got the DNA that store genetic materials needed for reproduction and transfer of trait from generations to generations...
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Describe the hypothesized steps for the evolution of eukaryotic cells via endosymbiosis
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---2septiembre 20232022/2023
- first endosymbiosis is when one symbiotic species is taken inside the cytoplasm of another symbiotic species and both become endosymbiotic. What happens is that two different species of prokaryotes fused together or simply when one species enter into the cytoplasm of another species through genome fusion. This will result in a specie (genome) having or inheriting the genes from the Endosymbiont and the host, a system refers to as the Endosymbiont Theory.
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