Which element is least useful for dating fossils greater than 10 million years old?
a. Carbon-14
b. Uranium-238
c. Uranium-235
d. Thorium-232
e. Rubidium-87
ANSWER: a
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The protists are a diverse group of organisms that have traditionally been grouped together because they all ____
a. have the same type of nutrition b. live in the same environments c. have very similar DNA sequences d. have very similar shapes e. are not prokaryotes, fungi, plants, or animals
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, with the following results for the offspring:478 flies with red eyes and a black body 27 flies with red eyes and a gray body 462 flies with purple eyes and a gray body 33 flies with purple eyes and a black 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
The human has __________ sets of autosomal chromosomes. What will be an ideal response?
What type of fatty acids include omega-3 and omega-6?
What will be an ideal response?