#Question id: 4748
#Unit 8. Inheritance Biology
Eye color in Drosophila present on X chromosome, Red eye color is dominant over white eye color. There is non disjunction in Meiosis I in female and normal meiosis in male. Female is white eye color was cross with red eye male. What will be expected phenotype in their progeny?
#Question id: 23878
#Unit 13. Methods in Biology
#Question id: 10968
#Unit 7. System Physiology – Animal
Which of the following is TRUE concerning erythroblastosis fetalis (hemolytic disease of the newborn, HDN)?
#Question id: 11507
#Unit 9. Diversity of Life Forms
Which two genera have members that can evade the human immune system by frequently changing their surface proteins?
1. Plasmodium
2. Trichomonas
3. Paramecium
4. Trypanosoma
5. Entamoeba
#Question id: 4459
#Unit 3. Fundamental Processes
Give correct explanation, why RNA polymerase can initiate a new RNA chain on a DNA template without any primer?
A. Because RNA polymerase starts most transcripts with an A, and that ribonucleotide binds the template nucleotide (T) with only two hydrogen bonds.
B. The enzyme has to make specific interactions with one or all of the DNA template strand, the initiating ribonucleotide, and the second ribonucleotide—holding one (or all) rigidly in the correct orientation to allow chemical attack on the incoming NTP.
C. The structure of the open complex shows that the s region 3/4 linker interacts with the template strand, organizing it in the correct conformation and location to allow initiation.
D. Consistent with this, in experiments using an RNA polymerase containing a s70 derivative lacking this part of s, initiation requires much lower than normal concentrations of one or both of the first two ribonucleotides.