________ causes 15 - 20% of all human deaths in developed countries
a. Heart disease
b. Strokes
c. Cancer
d. Car accidents
e. Diabetes
c
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Why have scientists been unable to grow the majority of bacteria and archaea in pure culture in a laboratory setting?
A. Most microorganisms reside in extreme environments that are toxic to human life, so samples cannot be collected for cultivation of the microbial inhabitants in the laboratory. B. Many species have metabolic requirements that are difficult to fulfill in the laboratory. C. DNA sequencing technology was not sufficiently advanced to give scientists the ability to identify prokaryotic species in nature, a requisite for growing microbes in the laboratory. D. Cells with unusual morphological characteristics cannot be grown in the laboratory.
The layers of peptidoglycan of the bacterial cell wall can be cross-linked by peptide intrabridges or by direct cross-linking.
Answer the following statement true (T) or false (F)
Could two phenotypically normal parents have a color-blind child?
a. Yes b. No
The two most basic steps of DNA replication are
A) primase causes primer to bind the template and ligase copies the template. B) helicase unwinds the template and DNA polymerase binds the template. C) leading strand is copied first and lagging strand is copied second. D) the new strand is denatured and a template is synthesized. E) the template is denatured and a new strand is synthesized.