Which of the following is not a protein or group of proteins required for conjugation to occur?

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#Question id: 5295

#Unit 8. Inheritance Biology

A cross is made between an Hfr that is met+ thi+ pur+ and an F-that is met- thi- pur-. Interrupted mating studies show that met+ enters the recipient last, so met+ recombinants are selected on a medium containing supplements that satisfy only the pur and thi requirements.  These recombinants are tested for the presence of the thi+ and pur+ alleles. The following numbers of individuals are found for each genotype:

A) Gene Order	I	Thi Pur  Met
	II	Pur  Met  Thi
	III	Pur   Thi  Met
B) Distance between Pur and Thi	IV	15.4 map unit
	V	1.8 map unit

What is the following correct combination?

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#Question id: 23839

#Unit 2. Cellular Organization

Which of the following myosin molecule have 2 heads, but does not assemble into filaments?

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#Question id: 6992

#Unit 5. Developmental Biology

Epimorphosis is regeneration through:

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#Question id: 4322

#Unit 3. Fundamental Processes

If a particular operon encodes enzymes for making an essential amino acid and is regulated like the trp operon, then

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#Question id: 9052

#Unit 9. Diversity of Life Forms

Which of the following causes seasons on Earth?