Sulfolobus grows in aquatic environments at temperatures up to ________ and a pH of ________
a. 80°C / 1–5
b. 90°C / 1–5
c. 70°C / 7–10
d. 100°C / 3–6
Answer: B
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The temperatures at the equator remain warm year round because
A) there are large oceans near the equator that absorb large amounts of heat. B) the sun shines longer over the equator than it does over other parts of Earth. C) Earth's rotation on a tilted axis creates more atmospheric friction at the equator. D) Earth's natural curvature places the equator nearer to the sun. E) sunlight strikes the equator relatively directly with little seasonal variation.
If a cell starts out with 86 chromosomes, how many chromosomes will there be in each cell formed at the end of meiosis II?
A. 86 B. 43 C. 172 D. 21
The DNA double helix is held together by (covalent/ionic/hydrogen) bonds
What will be an ideal response?
A scientist makes three artificial mRNA strands: (x) 5' AAAUUUAAAUUUAAAUUUAAAUUUAAA 3'(y) 5' UUUCCCUUUCCCUUUCCCUUUCCCUUU 3'(z) 5' AUAUAUAUAUAUAUAUAUAUAUAUAU 3'When he analyzes the polypeptides produced, he finds that:x produces a polypeptide that is 50% phenylalanine and 50% lysine.y produces a polypeptide that is 50% phenylalanine and 50% proline.z produces a polypeptide that is 50% isoleucine and 50% tyrosine.Based on these results only, the best conclusion to make is that
A. AAA codes for lysine. B. AAA codes for phenylalanine. C. AUA codes for isoleucine. D. AAA codes for lysine and AUA codes for isoleucine. E. AAA codes for phenylalanine and AUA codes for isoleucine.