Which of the following is a major distinction between a transposon and a retrotransposon?
a) A retrotransposon always uses the copy-paste mechanism, while a transposon uses cut and paste mechanism.
b) A transposon is related to a virus and a retrotransposon is not.
c) A transposon moves via a DNA intermediate and a retrotransposon via an RNA intermediate.
d) A transposon always leaves a copy of itself at its original position and a retrotransposon does not.
e) The positioning of a transposon copy is transient while that of a retrotransposon is permanent.
Answer: c) A transposon moves via a DNA intermediate and a retrotransposon via an RNA intermediate.
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Choose the true statements about the human and mouse genomes.
_____ The human genome shares 99% of its genes with the mouse genome. _____ A comparison of genomes confirms that mice and humans shared a common ancestory more recently than humans and pufferfish. _____ Very few genes are conserved in the two genomes. _____ Little rearrangement of genes has occurred in the two genomes.
According to Wilhelm Stern's method of measurement, a ten-year-old child who is able to perform the mental tasks of a ten-year-old (but not of an eleven-year old) has an IQ of ____
a. 80 b. 90 c. 100 d. 110 e. 120
Follow a particle of an indigestible food molecule from entrance to exit of the body
What will be an ideal response?
How do cells in the human body release energy stored in an adenosine triphosphate molecule (ATP)?
A by releasing adenosine in ATP B by trapping ATP from carbohydrates C by breaking a phosphate bond in ATP D by combining ATP molecules in chlorophyll