what are some examples of environmental stress?
What will be an ideal response?
fever, hypothermia, sunburn, lack of sleep, menses, or psychological
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A microbiologist would like to use a noncompetent genus of streptococcal bacteria, Enterococcus faecalis, as a cloning host to express genes from Streptococcus pneumoniae, which is naturally competent. Is this possible?
A. Yes; electroporation or chemical transformation can be used to make non-competent Streptococcus mutants, from which genes can be inserted into a cloning vector and introduced into Enterococcus. B. Yes; since the cloning host and the DNA to be introduced are both from bacteria that are streptococci, natural competence in this case is not necessary as long as the appropriate vector is used. C. Yes; electroporation or chemical transformation can be used to make Enterococcus competent, and then genes from Streptococcus can be introduced via a cloning vector. D. No; competence factor is an essential protein that enables the uptake of foreign DNA, therefore a cloning host such as Enterococcus that lacks competence factor protein is unable to be transformed by electroporation or chemical transformation.
__________ prevent fish sperm from fertilizing frog eggs
a. Energetic barriers b. Biological barriers c. Postzygotic barriers d. Ecological barriers e. Prezygotic barriers
"She is a carrier of the cystic fibrosis trait." This statement acknowledges that this person is
A. homozygous for the trait. B. heterozygous for the trait. C. trisomic. D. carrying two recessive alleles.
During protein synthesis in eukaryotes, what happens during RNA splicing?
A. The product of transcription, called the primary transcript, is cut and some pieces are joined back together to form the mature mRNA. B. The product of transcription, called the secondary transcript, is cut and some pieces are joined back together to form the mature mRNA. C. The product of transcription, called the primary transcript, is cut and some pieces are joined back together to form the mature tRNA. D. The product of transcription, called the primary transcript, is cut and all pieces are joined back together to form the mature mRNA. E. The product of translation, called the primary transcript, is cut and some pieces are joined back together to form the mature mRNA.