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#Question id: 6961

Do HOX genes play a role in the development of C. elegans?

#XL - T Zoology
  1. No, C. elegans does not have HOX genes
  2. No, C. elegans has HOX genes but none of them are used during development
  3. Yes, C. elegans has 4 clusters of HOX genes, just like mammals, that are required for specification of the identity of structures during embryogenesis
  4. Yes, but only one HOX gene is required in the embryo; the others provide positional identity in the larva
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TLS Online TPP Program

#Question id: 1560

#XL - S Microbiology

An invertebrate, such as an insect, has innate immunity that can be nonspecific about which pathogens are prevented from harming its metabolism. Which of the following is most likely to function this way in the insectʹs intestine?
TLS Online TPP Program

#Question id: 674

#XL - Q Biochemistry

Proline is not often found in a-helices of proteins because it
TLS Online TPP Program

#Question id: 27312

#XL - T Zoology

RNA contains uracil in place of thymine. Uracil has the same single-ringed structure as thymine, except that it lacks the_______
TLS Online TPP Program

#Question id: 11147

#XL - T Zoology

The concentrations of ions are very different inside and outside a nerve cell due to ________.
TLS Online TPP Program

#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?