Which of the following is NOT one of the factors
contributing to the high cost of sexual reproduction?
a. development and maintenance of specialized
reproductive structures
b. formation and nourishment of gametes
c. maintaining reproductive timing mechanisms
d. maintaining body cells
e. protection and nourishment of offspring
Answer: d
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The hyphae of basidiomycetes:
A. can contain one diploid nucleus B. can contain one haploid nucleus C. can be dikaryotic D. can be heterokaryotic E. can be any of the choices provided except "one diploid nucleus"
What is the role of cis-acting and trans-acting factors in transcription? Explain how these factors play a role in the lac operon, and discuss how complementation can be used to identify where the mutations have occurred (structural genes versus
regulatory regions). Which type of mutations can be complemented by a second gene with normal function? Are IS and OC mutants cis- or trans-acting?
The movement of molecules with/down a concentration gradient through transport proteins in the cell membrane is a type of
A.) selective transport. B.) osmosis. C.) energy expenditure. D.) facilitated diffusion.
Domestication of dogs has led to
A. a variety of homologous structures. B. a variety of different species. C. a variety of mutations. D. a variety of phenotypes. E. a variety of reproductively isolated breeds.