Practice Questions

TLS Online TPP Program

#Question id: 12252

In a study of interactions between plants, ants and caterpillars, the following experimental treatments were imposed: i) Control (both ants and caterpillars are present); ii) Ant removal; iii) Caterpillar removal; iv) Ant and caterpillar removal. Plus (+) indicates presence and minus (-) indicates absence on plants. The results for plant performance (growth) from this experiment are shown in the figure below. Plant performance in all treatments were significantly different from each other. Based on these results, which of the following inferences is correct?

#Unit 10. Ecological Principles

In the absence of caterpillars, ants negatively affected plant performance
In the absence of ants, caterpillars positively affected plant performance
In the presence of caterpillars, ants negatively affected plant performance
In the presence of ants, caterpillars positively affected plant performance

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TLS Online TPP Program

#Question id: 16482

#Unit 12. Applied Biology

In vitro culture and growth of organs or parts thereof in which their various tissue components, functions are preserved both in terms of their structure and function is called as

TLS Online TPP Program

#Question id: 6987

#Unit 5. Developmental Biology

Which of the following statements about axon-guidance is TRUE?

TLS Online TPP Program

#Question id: 14983

#Unit 2. Cellular Organization

A network of intermediate filaments, called the nuclear lamina, lies against the inner surface of the envelope and supports it. Which structure usually is associated with the inner membrane

TLS Online TPP Program

#Question id: 10700

#Unit 10. Ecological Principles

Which of the following most important conclusion from the graph?

TLS Online TPP Program

#Question id: 15817

#Unit 8. Inheritance Biology

You and your lab partner have isolated 20 new mutant yeast strains that are defective in synthesis of threonine, an amino acid. These Thr- mutants do not grow on minimal medium, but they do grow on minimal medium supplemented with threonine. Ten of your Thr- mutants (numbered 1 through 10) were isolated in a strain of mating type a (MAT a). The other 10 Thrmutants (numbered 11 through 20) were isolated in a strain of mating type α (MAT α). You and your lab partner cross each of the MAT a strains to each of the MAT α strains, and you include crosses to the appropriate wild-type strains. Your experimental observations are shown in the table below, where (-) indicates diploids that did not grow on minimal medium and (+) indicates diploids that did grow on minimal medium

Based on these experiments, what is the minimum number of genes required for threonine synthesis?