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TLS Online TPP Program

#Question id: 15817

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?

#Unit 8. Inheritance Biology
  1. Seven
  2. Two
  3. Four
  4. Five
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TLS Online TPP Program

#Question id: 10243

#Unit 10. Ecological Principles

A group of species that potentially compete with one other for a resource, such as insect- eating birds, is called a
TLS Online TPP Program

#Question id: 1241

#Unit 4. Cell Communication and Cell Signaling

Which of the following is a common step in the opening/closing of ion channels by acetylcholine and rhodopsin binding to their receptors?
TLS Online TPP Program

#Question id: 5789

#Unit 8. Inheritance Biology

Which of the following defects causes ataxia telangiectasis?
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#Question id: 23204

#Unit 13. Methods in Biology

Shadow casting is a technique in electron microscopy visualizing 
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#Question id: 24523

#Unit 11. Evolution and Behavior

Adaptation is the process in which animals has chances to increasing surviving ability such as in case of  warfarin the heterozygous allele have more surviving ability in compare to homozygous sensitive and homozygous recessive, what will be the reason behind that  homozygous  recessive will not be survive?