Practice Questions

TLS Online TPP Program

#Question id: 1370

H. V. Wilson worked with sponges to gain some insight into exactly what was responsible for holding adjacent cells together. He exposed two species of differently pigmented sponges to a chemical that disrupted intercellular junctions, and the cells of the sponges dissociated. Wilson then mixed the cells of the two species and removed the chemical that caused the cells to dissociate. Wilson found that the sponges reassembled into two separate species. The cells from one species did not interact or form associations with the cells of the other species.

How do you explain the results of Wilson's experiments?

#Unit 4. Cell Communication and Cell Signaling

The two species of sponge had different enzymes that functioned in the reassembly process.
The molecules responsible for cell-cell adhesion (cell junctions) were irreversibly destroyed during the experiment.
The molecules responsible for cell-cell adhesion (cell junctions) differed between the two species of sponge.
One cell functioned as an organizer for each organism, thereby attracting only cells of the same species.

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TLS Online TPP Program

#Question id: 13002

#Unit 3. Fundamental Processes

Where in a eukaryotic cell do you think you would find each of the following proteins residing when it is actively performing its function. Be as specific as you can in terms of subcellular location.

Match the following with the correct subcellular location;

I) Polymerases

a) In the cytoplasm

II) Ribosomal proteins

b) Inside the plasma membrane.

III) DNA ligase

c) In the mitochondrial matrix

IV) protein that allows ions to pass in and out of the cell

d) In the nucleus of cells

V) Activator protein

e) Inside the nuclear membrane

VI) an enzyme in the Krebs/TCA cycle

VII) a protein that forms a channel through which mRNAs can be exported into the cytoplasm

TLS Online TPP Program

#Question id: 13003

#Unit 8. Inheritance Biology

If 200 meiocytes with AaBb and 80 meiocytes undergoes to single crossing over between gene A and B. What will be the chance of crossing over and what is the recombination frequency of the gametes?

TLS Online TPP Program

#Question id: 13004

#Unit 8. Inheritance Biology

If the 120 meiocytes undergoes to the single crossing over then what will be the correct prediction about this ;

TLS Online TPP Program

#Question id: 13005

#Unit 8. Inheritance Biology

50 meiocytes with the genotype AaBb has 5% recombinational frequency in their gametes A and B, then how many meiocytes undergoes to the single crossing over ?

TLS Online TPP Program

#Question id: 13006

#Unit 10. Ecological Principles

According to the logistic growth equation dN/dt = rmaxN(K - N)/K

TLS Online TPP Program

#Question id: 13007

#Unit 10. Ecological Principles

A population's carrying capacity