TLS Online TPP Program

#Question id: 3553


Diploid cell genotype AaBb undergoes meiosis that generates new combinations of alleles by which mechanism when gene A and B located on the same chromosome?  

#Unit 8. Inheritance Biology
  1. It arises from independent assortment, the random segregation of chromosomes in anaphase I of meiosis.

  2. It arises from crossing over the exchange of genetic material in prophase I of meiosis.

  3. It arises from random arrangement of maternal and paternal chromosome

  4. It arise from splitting of hybrid

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TLS Online TPP Program

#Question id: 19201

#Unit 12. Applied Biology

Biocatalytic reactions that can be assayed by ion-selective electrode biosensors could be
1. Conversion of urea into ammonium ions
2. Lipid breakdown into fatty acids and hydrogen ions
3. Conversion of glucose into gluconic acid
4. Glucose breakdown into acetyl coA
Which of the above statements are incorrect?

TLS Online TPP Program

#Question id: 13136

#Unit 10. Ecological Principles

The figure below illustrates the relationship between population density in the present generation (Nt) and population equilibrium density of this population in the next generation (Nt+1). The dashed reference line has a slope of 1. Which of the following represents equilibrium density of this population?


TLS Online TPP Program

#Question id: 31039

#Unit 4. Cell Communication and Cell Signaling

Phosphorylation of tyrosine in activation loop leads to a conformational change in the activation loop that unblocks the kinase active site for either ATP or the substrate by:
Reducing the Kd 
Increasing the Kd
Reducing the affinity
Increasing the affinity

Which of the following combination is correct?

TLS Online TPP Program

#Question id: 15766

#Unit 5. Developmental Biology

 If a stem cell divides symmetrically, results

TLS Online TPP Program

#Question id: 10134

#Unit 6. System Physiology – Plant

Some herbicides such as dichlorophenyldimethylurea (DCMU, also known as diuron) and paraquat, block photosynthetic electron flow from where ?

a.) DCMU blocks electron flow at the quinone acceptors of PSII, by competing for the binding site of plastoquinone that is normally occupied by PQB

b.) Paraquat accepts electrons from the early acceptors of PSI and then reacts with oxygen to form superoxide, O2 – , a species that is very damaging to chloroplast components

c.) DCMU blocks electron flow at the pheophytin acceptors of PSII, by competing for the binding site of pheophytin

d.) Paraquat accepts electrons from the Iron-sulfur system of PSI and then reacts with oxygen to form superoxide, O2 – , a species that is very damaging to chloroplast components

Which of the following combination is true?