Explanation:
Platelets are tiny blood cells that help your body form clots to stop bleeding. If one of your blood vessels gets damaged, it sends out signals to the platelets. The platelets then rush to the site of damage and form a plug (clot) to fix the damage.
Answer:
gain; presence
Explanation:
The Ames test is a lab methodology used to determine whether a particular chemical substance can trigger mutations in an organism, which can be used to indicate whether exposure to the target chemical compound is associated with a greater risk of developing cancer. The Ames test can use a strain of <em>Salmonella typhimurium</em> carrying mutations in a key gene that encodes a protein involved in histidine biosynthesis. In consequence, this <em>S. typhimurium</em> strain is considered to be a 'histidine auxotroph' which is unable to synthesize histidine residues. After exposure to the target chemical compound, bacteria are then cultured in a medium lacking histidine. Subsequently, bacteria that regain the ability to synthesize histidine proliferate to form colonies. Finally, the number of these colonies is then compared with the number of mutants in absence of the potential mutagen, enabling thus the determination of the mutagenic potential of the target chemical compound.
The correct answer is option D
The valid concern of biotechnology on biodiversity is that genetically modified fish could be accidentally released into the environment and those genetically engineered species will breed with the wild type population and the population of modified genes will increase. The concern is true, as if this happens there will be no wild type left in the environment.
Tissue culture is an important tool for the study of the biology of cells from multicellular organisms. It provides an in vitro model of the tissue in a well defined environment which can be easily manipulated and analysed
Advantages of Tissue Culture
The plantlets are obtained in a very short time with a small amount of plant tissue. The new plants produced are disease-free. The plants can be grown throughout the year, irrespective of the season. A large space is not required to grow plants by tissue culture technique
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The answer is -6 Fahrenheit