TLS Online TPP Program

#Question id: 5250


A researcher would like to map the location of galE and trpA genes in a new species of bacterium that appears to be closely related to E. coli. He decides to use cotransduction, and generatesnappropriate donor and recipient strains. He is disappointed when cotransduction is not seen in his experiement. What is the most reasonable explanation for this situation?

#Unit 8. Inheritance Biology
  1. His new bacterial species does not have galE or trpA genes.

  2. His new bacterial species cannot survive galE or trpA mutation.

  3. These two genes are too far apart to be mapped by cotransduction.

  4. These two genes are too close together to be mapped by cotransduction

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TLS Online TPP Program

#Question id: 7760

#Unit 5. Developmental Biology

In general, the hormones that regulate senescence can be divided into two basic categories based on their most commonly observed effects:
I) positive (promoting) senescence regulators and
II) negative (repressing) senescence regulators
a) Hormones involved-Ethylene, Abscisic acid (ABA)
b) Hormones involved-Brassinosteroids (BRs), Salicylic acid (SA), Jasmonic acid (JA)
c) Hormones involved-Cytokinin, Auxin, Gibberellin (GAs)
Select correct combinations from given hormones which are involved in regulators?

TLS Online TPP Program

#Question id: 2437

#Unit 2. Cellular Organization

Membrane extension involves

a. bending actin filaments.                   

b. myosin II.

c. the Arp2/3 nucleation of new filaments.

d. actin depolymerization.     

e. actin polymerization.

TLS Online TPP Program

#Question id: 3825

#Unit 3. Fundamental Processes

Telomeres are the repetitive sequence of T's and G's that are present in the eukaryotes to protect the random cleavage from nucleases. These telomeres are synthesized by the enzyme telomerase. Which of the following are the properties of enzyme telomerase?

TLS Online TPP Program

#Question id: 10920

#Unit 6. System Physiology – Plant

The pressure-flow model, first proposed by Ernst Münch, Phloem loading at the source and phloem unloading at the sink establish the pressure gradient.

a.) In source tissues, an accumulation of sugars in the sieve elements generates a lower or negative solute potential (ψs).

 b.) source tissue, causes a steep drop in the water potential (ψ), due to water potential gradient, water enters the sieve elements and causes turgor pressure (ψp ) decrease.

c.) In sink tissues, phloem unloading leads to a lower sugar concentration in the sieve elements, generating a higher or less negative solute potential.

d.) As the water potential of the phloem rises above that of the xylem, water tends to leave the phloem in response to the water potential gradient, causing a decrease in turgor pressure in the sieve elements of the sink.

Which of the following statements of sink and source tissue is FALSE?

TLS Online TPP Program

#Question id: 1314

#Unit 4. Cell Communication and Cell Signaling

In desmosomes, cadherins link to an adjacent cell via: