Answer:
the time taken for the radioactivity of a specified isotope to fall to half its original value.
The half-life of an isotope is used to describe the rate at which the isotope will decay and give off radiation. Using the half-life, it is possible to predict the amount of radioactive material that will remain after a given amount of time.
Explanation:
Answer:
B
Explanation:
RNAi is a cellular mechanism for post-transcriptional gene silencing. After transcription of a gene into mRNA, small interfering RNA (siRNA) and microRNA (miRNA) can target the mRNA to form dsRNA. This mRNA then becomes a target of ribonucleases such as the Dicer that break it apart. These mRNA, therefore, do not reach the cytoplasm for translation by ribosomes. This mechanism is hence harnessed and manipulated by scientists to study genes by silencing them.
Answer: Option C
Explanation:
Phenylketonuria is a rare genetic disorder in which an amino acid known as phenylalanine to build up inside the body.
PKU is a disorder in which the there is a defect in the gene which helps in create the enzyme needed to breakdown the phenylalanine.
The level of phenylalanine in the individuals before birth is normal but after birth the concentration of the amino acid phenylalanine is abnormally high because the enzyme is not synthesized in the body that is responsible for its breakdown.
Answer:
D
Explanation:
Normal wings, brown body, legs on head, and red eyes.
Snake is the correct answer, they are ectothermic