You discover a rare new bird species, but you are unable to observe its mating behavior. You see that the male is large and ornamental compared with the female. On this basis, you can probably conclude that the species is

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#Question id: 18079

#XL - S Microbiology

Within a gymnosperm megasporangium, what is the correct sequence in which the following should appear during development, assuming that fertilization occurs? 

1. Sporophyte embryo 2. female gametophyte 

3. egg cell                 4. megaspore 

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#Question id: 1724

#XL - Q Biochemistry

Which of the following statements is the single best defining characteristic of a follicular dendritic cell (FDC)?

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#Question id: 11502

#XL - S Microbiology

Which of these statements is false and therefore does not support the hypothesis that certain eukaryotic organelles originated as bacterial endosymbionts? Such organelles

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#Question id: 5295

#XL - S Microbiology

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: 12790

#XL - R Botany

Which of the following are responsible for the conversion of most organic material into CO  , which can be utilized2 in primary production?