What are atmospheric low pressure zones? Where are they found, and why are these zones significant for traditional marine navigation?
What will be an ideal response?
In zones of low atmospheric pressure, located at 0 degrees and 60 degrees N and S, low-density air rises. These zones are significant for sailors because the wind movement is unsteady and unreliable. The zone of low atmospheric pressure at the equator is known as the doldrums, and is infamous for stranding sailing ships for extended periods without winds to move them.
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Metabolism is a unifying characteristic of all cellular organisms
Indicate whether the statement is true or false.
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.
Characters that have a continuous distribution, such as height, weight, and skin color, are called ____, and the
individual genes that control them are known as ____.
a. quantitative phenotypes; quantitative trait markers b. quantitative genotypes; quantitative trait loci c. quantitative traits; quantitative trait markers d. quantitative traits; quantitative trait loci e. quantitative markers; quantitative trait markers
In the biosynthesis of nucleotides, pyrimidines are assembled starting with ribose-5-phosphate while ribose-5-phosphate is added after synthesis of the nitrogenous base for purines.
Answer the following statement true (T) or false (F)