Organisms evolve over generations to become adapted to the environmental conditions to which they are exposed. The diversity of organisms that

occurs in any particular area thus may be largely determined by the abiotic factors limiting survivorship and reproduction of organisms in a region. Which of the following limit the range of Saguaro cactus in North America?

I) pollinators

II) sunlight

III) precipitation

IV) temperature

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#Question id: 12234

#Unit 10. Ecological Principles

All of the following have been used by plants to avoid being eaten except

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#Question id: 3850

#Unit 3. Fundamental Processes

The RNA molecule produced in RNA synthesis is:

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#Question id: 751

#Unit 1. Molecules and their Interaction Relevant to Biology

The effect of alkali is to change the ___________________ of the DNA structure:

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#Question id: 10249

#Unit 10. Ecological Principles

A niche is

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#Question id: 15147

#Unit 8. Inheritance Biology

You have isolated a set of five yeast mutants that form dark red colonies instead of the usual white colonies of wild-type yeast. You cross each of the mutants to a wild-type haploid strain and obtain the results shown below;

you cross each haploid mutant strain to a different haploid mutant of the opposite mating type. From the results shown below deduce as much as you can about which mutations lie in the same gene. Clearly state any remaining ambiguities and suggest some general ways that the ambiguities might be resolved

a) That mutants 1 and 3 form one complementation group and are mutations in the same gene (gene A) 

b) That mutations 2 and 5 form a second complementation group and are mutations in a second gene (gene B).

c) That mutations 3 and 5 form a second complementation group and are mutations in a second gene (gene B).

d) The first ambiguity is whether mutant 4 has a mutation in gene A or B, or whether it represents a unique gene.

Which of the following is the correct prediction about mutants?