1. Why would archaea have ether-linked lipids rather than ester-linked lipids in their membranes?
2. What is a perfect flower?
3. Which of the lineages of life does AUG code for formyl methionine?
4. What feature of the rhyniophyte fossils indicated that they were the remains of a sporophyte?
5. Give three traits that separate angiosperms from gymnosperms.
2007-02-06 12:52:11 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Biology
1. Ether-linked lipids are more heat resistant than ester-linked lipids. This allows archea to survive in extremely hot environments.
2. A flower with both male and female reproductive organs.
3. AUG is the start codon in eucaryotes.
4. Rhyniophytes had a columella, a small column of tissue, running up through the center of the "stem", as do modern sporophytes.
5. Flowers, endosperm (nutrative tissue in seed) and a closed carpel enclosing the ovum.
2007-02-06 13:52:43 · answer #1 · answered by dtbrantner 4 · 1⤊ 0⤋
The previous answerer is 4 for 5.
3. AUG is the start codon. In prokaryotes, it codes for formyl methionine in the start position and methionine after the start codon. In eukaryotes, it only codes for methionine.
2007-02-06 16:47:24 · answer #2 · answered by novangelis 7 · 0⤊ 0⤋
2. Perfect flowers have both male and female parts in the same flower -- stamens and pistil.
2007-02-06 12:54:46 · answer #3 · answered by ecolink 7 · 0⤊ 0⤋