Which feature of Archaea is shared with Bacteria but not with Eukarya?
a. the sequestration of DNA into a nucleus
b. the common occurrence of introns
c. the chemical structure of the cell walls
d. the plasma membrane structure
e. a genome comprised of a single, circular molecule of DNA
ANSWER: e
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Which of the following characteristics separates primates from other mammals?
A. Primates are all placental animals, whereas other mammals are not. B. Primates all have opposable thumbs, whereas other mammals do not. C. Primates have nails instead of claws. D. Primates can regulate their body temperature. E. Primates are the only mammals that have eyes on the front of the face.
If you want to analyze this data for evidence of linkage between sn and car, what is the null hypothesis?
In Drosophila, singed bristles (sn) and carnation eyes (car) are both caused by recessive X-linked alleles. The wild-type alleles (sn+ and car+) are responsible for straight bristles and red eyes, respectively. A sn car female is mated to a sn+car+ male and the F1 progeny are interbred. The F2 are distributed as follows:
A) Genes sn and car are linked.
B) Genes sn and car are not linked.
C) Genes sn and car are located close together on the same chromosome.
D) Crossing-over sometimes occurs between sn and car.
All of the following are involved in PCR EXCEPT
a. free nucleotides. b DNA templates. c. high temperature. d. RNA polymerase. e. low temperature.
By organizing socially into a group, individual animals may benefit by
A) coexisting peacefully instead of fighting with group members for dominance. B) reducing intraspecific competition for food. C) increasing access to a common food supply. D) equalizing the number of offspring produced by each group member.