Where is double negative selection is found during T-cell formation?

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#Question id: 17281

#XL - R Botany

Identify each of the following structures as haploid or diploid: 

A) sporophyte 

B) spore 

C) gametophyte 

D) zygote 

E) Sperm

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#Question id: 792

#XL - T Zoology

Which arm of the tRNA can act as a structural recognition feature?

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#Question id: 12800

#XL - R Botany

Tropical grasslands with scattered trees are also known as

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#Question id: 5256

#XL - S Microbiology

If the experimental population of E. coli lacks an F factor or F plasmid, and if bacteriophage are excluded from the bacterial cultures, then which of these is a means by which beneficial mutations might be transmitted horizontally to other E. coli cells?

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#Question id: 377

#XL - S Microbiology

The aqueous solution with the highest pH is: