Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 46205
TLS Online TPP Program

#Question id: 10708

Which of the following statements is a likely explanation for why invasive species take over communities into which they have been introduced?

#SCPH06 I Botany
  1. Invasive species are less efficient than native species in competing for the limited resources of the environment.
  2. Invasive species are not held in check by the predators and agents of disease that have always been in place for native species.
  3. Invasive species have a higher reproductive potential than native species.
  4. Invasive species come from geographically isolated regions, so when they are introduced to regions where there is more competition, they thrive
More Questions
TLS Online TPP Program

#Question id: 15757

#SCPH05 I Biotechnology

Which of the following growth hormones produces apical dominance?
TLS Online TPP Program

#Question id: 15758

#SCPH05 I Biotechnology

Adsorbants like activated charcoal or PVP (polyvinylpyrrolidon) may be used as adsorbant to prevent
TLS Online TPP Program

#Question id: 15759

#SCPH05 I Biotechnology

Somatic hybrids exhibit the full somatic complement of one parental species, while all or nearly all chromosomes of the other parental species are lost during the preceding mitotic divisions; such hybrids arc referred to as
TLS Online TPP Program

#Question id: 15817

#SCPH01 Biochemistry

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?
TLS Online TPP Program

#Question id: 15817

#SCPH12 I Genetics

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?
TLS Online TPP Program

#Question id: 15818

#SCPH01 Biochemistry

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.

What is the maximum number of genes that these 20 mutants could represent?