At the beginning of this century there was a general announcement regarding the sequencing of the human genome and the genomes of many other multicellular eukaryotes
Many people were surprised that the number of protein-coding sequences was much smaller than they had expected. Which of the following could account for much of the DNA that is not coding for proteins? A) DNA that consists of histone coding sequences
B) DNA that is translated directly without being transcribed
C) non-protein-coding DNA that is transcribed into several kinds of small RNAs with biological function
D) non-protein-coding DNA that serves as binding sites for reverse transcriptase
C
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The liverwort genus Marchantia can reproduce asexually by way of ____, small cell masses that form in cuplike
growths on a ____.
a. antheridia; gemmae b. gemmae; thallus c. archegonia; thallus d. thallus; gemmae
e. antheridia; thallusA patient has a stroke that leaves him unable to hear. Where is the most likely location of the brain damage?
a. limbic association cortex b. prefrontal association cortex c. Wernicke's area d. temporal lobe e. somatosensory cortex
What is false about decapods?
a. first walking legs are usually modified. b. eyes are compound. c. they have only one pair of antennae. d. mandibles are used to crush food. e. sexes are usually separate.
What argument do scientists who support the metabolism-first model use to dispute the replicator-first model?
A) RNA can only be used to make proteins, not other nucleic acids. B) The replicator nucleic acid molecule would be too large and complex. C) Replicators cannot exist without metabolism. D) DNA cannot replicate without the help of proteins.