#Question id: 11516
#Unit 10. Ecological Principles
What type of survivorship curve do humans have?
#Question id: 79
#Unit 1. Molecules and their Interaction Relevant to Biology
The structure of D-arabinose is shown below. How many stereoisomers are possible for this molecule?
#Question id: 4267
#Unit 3. Fundamental Processes
The 3D structure of the complete Escherichia coli ribosome with bound mRNA and tRNAs revealed that the very amino terminus of one protein (L27) does reach into the active site. This finding suggested a role for this protein in catalysis. To test this possibility, the nine amino acids at the L27 amino terminus that were in close proximity to the active site were eliminated by mutation. The following possible outcomes were found to be correct as
A. The resulting cells produced ribosomes with reduced but detectable peptidyl transferase activity
B. Region of the L27 protein contributes to peptidyl transferase activity
C. The mutant ribosomes, didn’t synthesised wildtype levels of cells
D. Vast majority of this increase in peptide bond formation is retained, even without the presence of L27 in the active site
E. The most likely role for L27 is to correctly position one or more of the RNA components of the active site
#Question id: 3555
#Unit 8. Inheritance Biology
In watermelons, bitter fruit (B) is dominant over sweet fruit (b), and yellow spots (S) are dominant over no spots (s). The genes for these two characteristics assort independently. A homozygous plant that has bitter fruit and yellow spots is crossed with a homozygous plant that has sweet fruit and no spots. If an F1 plant is cross with the heterozygous for bitter and no spots, what phenotypes ratio are expected in the offspring?
#Question id: 13145
#Unit 8. Inheritance Biology