For the numbered steps below, select the option that places them in the correct order.
1) The ribosome binds to the mRNA and uses tRNAs to translate mRNA into the corresponding amino acid polypeptide sequence.
2) The spliceosome removes introns.
3) The primary structure of the polypeptide chain undergoes hierarchical foldings to form the tertiary structure.
4) RNA polymerase binds to the promoter region of a gene and initiates transcription.
A) 1 > 2 > 3 > 4
B) 4 > 2 > 1 > 3
C) 3 > 1 > 4 > 2
D) 2 > 1 > 4 > 3
Ans: B) 4 > 2 > 1 > 3
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Protista is an example of
A.) class B.) kingdom C.) species D.) genus
Hypothesis I: A flavin pigment absorbs blue light; this pigment then activates the proton pump.Hypothesis II: When CO2 concentration rises, a membrane receptor inactivates the proton pump.Air with varying amounts of CO2, within the ranges found in nature, is forced across leaf surfaces and into sub-stomatal cavities; this produces closure of the stomata.
A. Supports both hypothesis I and II. B. Supports only hypothesis I. C. Supports only hypothesis II. D. Supports neither hypothesis.
Earthworms show all of the following features except
A. containing distinct head regions and parapodia. B. containing touch-sensitive and light-sensitive organs in the segments. C. being hermaphroditic. D. containing fewer setae than in polychaetes. E. containing segments with a mouth on the first and the anus on the last.
Memory, emotions, and thinking about smells are all found in the ________
Fill in the blank(s) with correct word