#Question id: 5658
#Unit 5. Developmental Biology
Following events occur during fertilization in mammals.
A. sperm penetrates cumulus layer
B. sperm nucleus delivered into cytoplasm
C. sperm plasma membrane fuses with egg plasma membrane
D. calcium waves
E. enzymes released from acrosome on sperm head enable sperm to penetrate zona pellucida
F. transit through the cumulus or binding to zona pellucida elicits acrosomal reaction in sperm
G. egg completes meiosis and development is initiated
which of the following sequence is correct?
#Question id: 4114
#Unit 3. Fundamental Processes
Splice-site recognition is prone to two kinds of errors. First, splice sites can be skipped, with components bound at, for example, a given 5’ splice site pairing with those at a 3’ site beyond the correct one. Ways in which the accuracy of splice-site selection can be enhanced are as
A. The factors that recognize that site are transferred from the polymerase carboxy-terminal “tail” onto the RNA. Once in place, the 5’ splice site components are poised to interact with those other factors that bind to the next 3’ splice site to be synthesized.
B. SR (serine–arginine-rich) proteins bind to sequences called exonic splicing enhancers (ESEs) within the exons. SR proteins bound to these sites recruit the splicing machinery to the nearby splice sites to ensure correct splicing
C. By recruiting splicing factors to each side of a given exon, this process encourages the so-called “exon definition, contribute to correct splicing
D. Alternative splicing is intentional missplicing mechanism
Which of the following is INCORRECT?
#Question id: 15001
#Unit 8. Inheritance Biology
#Question id: 10579
#Unit 10. Ecological Principles
#Question id: 10277
#Unit 6. System Physiology – Plant
Each of the nine glycolytic intermediates between glucose and pyruvate is phosphorylated. The phosphoryl groups seem to have many functions such as,
a) The plasma membrane generally lacks transporters for phosphorylated sugars, the phosphorylated glycolytic intermediates cannot leave the cell
b) After the initial phosphorylation, further energy is necessary to retain phosphorylated intermediates in the cell, despite the large difference in their intracellular and extracellular concentrations
c) Phosphoryl groups are essential components in the enzymatic conservation of metabolic energy, Energy released in the breakage of phosphoanhydride bonds is partially conserved in the formation of phosphate esters such as glucose 6-phosphate
d) Binding energy resulting from the binding of phosphate groups to the active sites of enzymes lowers the activation energy and increases the specificity of the enzymatic reactions
which of the following functions shows Importance of Phosphorylated Intermediates?