Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 5085
TLS Online TPP Program

#Question id: 5298

Four E. coli strains of genotype a+ b− are labeled 1, 2, 3, and 4. Four strains of genotype a− b+ are labeled 5, 6, 7, and 8. The two genotypes are mixed in all possible combinations and (after incubation) are plated to determine the frequency of a+ b+ recombinants. The following results are obtained, where M = many recombinants, L = low numbers of recombinants, and 0 = no recombinants. On the basis of these results, assign a sex type (either Hfr, F+, or F−) to each strain

#Unit 8. Inheritance Biology

  1. Thus strains 2, 3, 4 and 7 are F−. Strains 1 and 8 are F+, and strains 5, and 6 are Hfr.

  2. Thus strains  3, and 7 are F−. Strains 1, 2 and 8 are F+, and strains 4, 5, and 6 are Hfr.

  3. Thus strains 2, 3, and 7 are F−. Strains 1, 6 and 8 are F+, and strains 4 and 5 are Hfr.

  4. Thus strains 2, 3, and 7 are F−. Strains 1 and 8 are F+, and strains 4, 5, and 6 are Hfr.

More Questions
TLS Online TPP Program

#Question id: 1790

#Unit 4. Cell Communication and Cell Signaling

Which of the following is an example of an anti-apoptotic molecule?
TLS Online TPP Program

#Question id: 1082

#Unit 4. Cell Communication and Cell Signaling

Which of the following is a type of signaling in which a cells respond to substrate that they themselves release ?
TLS Online TPP Program

#Question id: 10220

#Unit 6. System Physiology – Plant

Thylakoid membranes contain a protein kinase that can phosphorylate a specific threonine residue on the surface of LHCII. How the kinase is activated?
TLS Online TPP Program

#Question id: 24664

#Unit 2. Cellular Organization

Which of the following membrane protein do not bind with lipid and, once purified, behave like water-soluble proteins?
TLS Online TPP Program

#Question id: 7143

#Unit 5. Developmental Biology

The development of drugs to block the activity of vascular endothelial growth factor (VEGF) has been applied to the control of the growth of cancers. What is the rationale for such a strategy?