Alternative exons can arise through the duplication and divergence of existing exons. What type of mutation below would be least tolerated during the evolution of a new exon?
(a) a nucleotide change of A to G
(b) a deletion of three consecutive bases
(c) mutation of the first nucleotide in the intron
(d) a nucleotide change that alters a TT dinucleotide to AA
(c) The first two nucleotides in the intron are critical for signaling the exon–intron boundary; changing them would make the exon unable to be properly spliced.
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The homeostatic interaction between the endocrine system and which other system is demonstrated by
the hypothalamus regulating the release of sex hormones? a. circulatory system b. reproductive system c. digestive system d. muscular system e. urinary system
There is a general inverse relationship between DNA content and organismic complexity
Indicate whether the statement is true or false
Which of the following is a function of a tRNA molecule?
A) recognizing the appropriate anticodons in mRNA B) transferring nucleotides to rRNA C) helping to translate codons into nucleic acids D) joining to only one specific type of amino acid
Overall, the membrane-associated electron transport system pumps ________ protons across the membrane for every molecule of NADH that is oxidized.
A) 2 B) 5 C) 6 D) 10