Why are there fewer tRNA anticodons than the 61 needed to match each mRNA codon that codes for an amino acid?
A. There is some flexibility in pairing between the 5' base of the codon and the 3' base of the anticodon.
B. There is some flexibility in pairing between the middle base of the codon and the middle base of the anticodon.
C. There is some flexibility in pairing between the 3' base of the codon and the 5' base of the anticodon.
D. There is some flexibility in pairing between all 3 bases of the codon and all 3 bases of the anticodon.
C. There is some flexibility in pairing between the 3' base of the codon and the 5' base of the anticodon.
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Mechanisms that evolved in plants to regulate the rate of water loss do not include
A. becoming dormant during dry times of the year. B. losing leaves. C. producing leaves that are thick and hard. D. containing stomata in crypts or pits. E. increasing the number of water vacuoles in the cells.
Rainfall in the Northern Hemisphere is greater than rainfall in the Southern Hemisphere
Indicate whether the statement is true or false
Which nutrients often limit the distribution and abundance of photosynthetic organisms?
A) water and oxygen B) nitrogen and phosphorus C) carbon dioxide and nitrogen D) water and carbon dioxide
The expressed (coding) regions of eukaryotic genes are called ________
A) caps B) promoters C) exons D) introns