Which of the following components is NOT part of the modern cell theory?
A) All living organisms are made up of one or more cells.
B) Cells are the functional units of multicellular organisms.
C) The smallest living organisms are single cells.
D) All cells arise from preexisting cells.
E) Bacteria are examples of eukaryotic cells.
E
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Which of the following correctly indicates the complementary base pairing of adenine in DNA and RNA?
A. adenine with thymine in both DNA and RNA B. adenine with uracil in DNA and with thymine in DNA C. adenine with thymine in DNA and with uracil in RNA D. adenine with cytosine in DNA and with guanine in RNA E. adenine with guanine in DNA and with cytosine in RNA
placement of the phylum Platyhelminthes in the phylogenetic tree differs between a morphologically based phylogeny and a molecular based phylogeny. Which of the following statements best describes the interpretation based on molecular phylogeny?
A. Modern Platyhelminthes do not have a coelom but did originate from an ancestor that had one. B. The Platyhelminthes clade separated from other clades before coeloms evolved and consequently Platyhelminthes have never had a coelom. C. Platyhelminthes originated from ancestors with a coelom and have retained it to the present time. D. Platyhelminthes evolved from an ancestor without a coelom but developed one during the course of their evolution. E. Some Platyhelminthes have a coelom but others do not and it is difficult to conclude anything about its evolution within the clade.
The structure labeled "E" is formed
a. under favorable conditions. b. under unfavorable conditions. c. by mitosis. d. by meiosis. e. by fusion of individual cells.
The final electron acceptor in light reaction is
A) ATP B) Glucose C) NADP+ D) H2O