The taste known as sour is caused by
A. the presence of hydrogen ions.
B. hot materials.
C. sugars.
D. any kind of ions.
A. the presence of hydrogen ions.
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How does the simple primary and secondary structure of DNA hold the information needed to code for the many features of multicellular organisms?
A) The hydrogen bonding among backbone constituents carries coded information. B) The base sequence of DNA carries the information needed to code for proteins. C) The width of the double helix changes at each gene due to differences in hydrogen bonds. D) The amino acids that make up the DNA molecule contain the information needed to make cellular proteins.
According to the __________, the universe formed about 13 to 15 billion years ago and is still expanding. Fill in the blank(s) with the appropriate word(s)
A mammal is and has a body temperature .
A. ectothermic; that changes with fluctuation in environmental temperature B. endothermic; that changes with fluctuation in environmental temperature C. ectothermic; maintained by its own metabolism D. endothermic; maintained by its own metabolism E. None of the answer choices is correct.
Transcription in eukaryotes requires which of the following in addition to RNA polymerase?
A) start and stop codons B) ribosomes and tRNA C) several transcription factors D) aminoacyl-tRNA synthetase