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After one year (one half-life), half of the radioactive atoms have decayed to form stable daughter products, and 50% of the radioactive atoms remain. After another year (two half-lives), half of the remaining radioactive atoms have decayed, and 25% of the radioactive atoms remain.
The given question is incomplete. The complete question is:
Albinism is a genetic mutation that results in some animals being born without the enzyme that produces the pigment for skin and eye color. All BUT one statement is a possible explanation for this mutation. Which is NOT an explanation?
A) A DNA base in the gene for the enzyme was removed. B) A DNA base in the gene for the enzyme was substituted. C) The wrong mRNA code caused the wrong protein to form. D) The organism gained an extra chromosome because of a non-disjunction.
Answer:
D) The organism gained an extra chromosome because of a non-disjunction.
Explanation:
Albinism is a genetic disorder and is caused by a genetic mutation. A mutation that changes one or more bases in the gene is called substitution mutation. A substitution mutation in the gene for pigment production may result in the synthesis of non-functional or less functional pigments and thereby causing albinism.
Similarly, the deletion of one or more bases from the gene for pigment production would also result in the synthesis of a faulty protein. Incorporation of wrong amino acids in the protein by misreading the mRNA codon would result in the production of faulty pigment molecules.
However, a mutation that adds one extra chromosome to the genome of the organism due to non-disjunction of chromosomes during anaphase would not affect the gene for the pigment and thereby cannot cause albinism.
Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement.
Answer:
The correct answer will be option- A
Explanation:
Red drop effect is the effect observed by the light present in the spectrum of the wavelength of red light. The effect is observed with the decrease in the quantum yield of the oxygen formed per quantum of light when the wavelength of light exceeds 680 nm.
The decrease of quantum yield is observed due to the fact that the oxygen is formed by the breakdown of the water molecule during light-dependent reaction which is initiated by the PS II which begins the chain at 680nm.
If light exceeds the 680 nm then, PS II will remain inactive and thus will abrupt the dissociation of the water molecule and thus the formation of oxygen during the light-dependent phase.
Thus, option-A is the correct answer.
