Zero population growth is achieved when ____.
A. a population starts to decline
B. emigration and immigration are balanced, and the number of births equals the number of deaths
C. births exceed deaths
D. deaths exceed births
E. emigration and immigration are prevented
Answer: B
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While oncogenes are responsible for cancer cells, tumor-suppressing genes are responsible for
tumorous tissues. Indicate whether the statement is true or false.
An advantage to studying linkage disequilibrium is that ________
A) it provides another tool enabling the reconstruction of the history of genes and populations B) it provides clear evidence of speciation events C) it can be used to identify alleles that have been recently selected by natural selection D) Both A and C.
A young scientist has discovered a new species of grub worm in the Amazon. He would like to explore the possibility that in this grub worm the codon CUC is the start codon and codes for methionine, not leucine as it does in other worms. To date, he has been unable to get his research funded, most likely because
A) worms have been extensively studied and their genomes are simple. B) worms do not contain homologous genes to humans. C) codons are generally the same in all worms. D) the genetic code is universal to all species. E) worms are difficult to maintain in the laboratory.
Which of the following methods do fungi use in order to penetrate the initial layer of a plant's defenses?
A. entry through stomates B. mechanical bridging C. sharp mouthparts D. secretion of phospholipids to dissolve the cuticle