You have isolated and purified a new species of cells from the rain forest and you want to place this new species in the appropriate branch of the tree of life
You sequence the ribosomal RNA genes from these cells and discover that for one particular region of the ribosomal gene (the rRNA) the RNA sequence is AAUGAAGG.
You have sequences from the same region of the ribosomal genes (the rRNA) from each of these species: bacteria, eukaryote and archaea, which are listed below.
bacteria AUAGAUGG
eukaryote AAAGAAGG
archaea AAUGGAGU
Based on these sequence results to which branch of the tree of life should you assign this new species?
A) archaea
B) bacteria
C) eukaryote
D) bacteria and archaea
E) there is not enough information
Answer: C
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The terminating step of moving electrons onto oxygen releases additional ATP during aerobic metabolism not made during anaerobic growth
Indicate whether the statement is true or false.
If no introns remain in the final transcript but all exons do, what will be the final length of this mRNA shown in the illustration?
a. 485bp
b. 200bp
c. 280bp
d. 20bp
The extra-embryonic membrane that forms the
majority of the placenta is the a. amnion. b. allantois. c. chorion. d. yolk sac. e. umbilical cord.
What is the role of van der Waals interactions in biological molecules?
1. Van der Waals interactions are strong bonds that play a major structural role in holding proteins together.
2. Although they are weak bonds, van der Waals interactions involve the sharing of electrons.
3. Van der Waals interactions are important only in water.
4. Although they are weak bonds, van der Waals interactions help to reinforce the three-dimensional shapes of large molecules.
5. Van der Waals interactions are too weak to be significant.