When a plant reaches sexual maturity, the genes that control the production of __________
are inactivated and the genes that control __________ are activated.
a. flowers; leaves
b. flowers; roots
c. leaves; flowers
d. leaves; roots
C
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Eukaryotic cilia and flagella arise from which of the following cellular components?
a. nucleus b. Golgi complex c. centrioles d. chromosomes e. nucleolus
Scientists disagree about how many species are currently on earth for all of the following reasons EXCEPT:
a) there is controversy over whether natural selection is the only mode of speciation. b) there is not one true definition of species. c) at any one time, there are few populations in the process of speciation. d) there are many organisms on Earth that have yet to be discovered. e) different scientists use different techniques to estimate the actual number of species from the known number of species.
TRAIT SPECIESABCDE111011211010311100410000511100611011The table shows the distribution of traits (A-E) in six extant species (1-6). A "0" indicates the ancestral condition, while "1" indicates the derived condition. Which trait is least informative of phylogenetic relationships within the group?
A. A B. B C. C D. D E. E
To seal the cut fragments of DNA together, an enzyme called ________ is used.
A. trypsin B. amylase C. peptidase D. ligase