Which of the following is a serious concern when performing PCR?
A. Restriction enzymes are difficult to obtain in adequate quantities.
B. The high temperature needed may denature the DNA.
C. Lab personnel may be exposed to radiation.
D. PCR is a very time-consuming process.
E. Contaminating DNA may be introduced and amplified.
Answer: E
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In Drosophila melanogaster, the allele for red eyes is dominant over the allele for purple eyes, and the allele for a gray
body is dominant over the allele for a black body. A testcross was done to check for genetic linkage between the genes for these traits. The results for the offspring are listed below:478 flies with red eyes and a gray body 27 flies with red eyes and a black body 462 flies with purple eyes and a black body 33 flies with purple eyes and a gray body Which of the choices below best represents the map distance between the genes for these two traits?
a. 50.0 map units b. 30.0 map units c. 47.0 map units d. 27.0 map units e. 6.0 map units
What caused the ‘Dust bowl' region in the United States in the 1930s?
a. deforestation b. acid rain c. overgrazing on grasslands d. plowing of grasslands exposed topsoil to wind e. drought in undisturbed grasslands
After replication, chromosomes consist of how many molecules of DNA (assuming one chromatid is equal to one molecule of DNA)?
What will be an ideal response?
In all food chains, the flow of energy is unidirectional from the bottom to the top
Indicate whether the statement is true or false