Which of the following would contain
pluripotent stem cells?
a. an embryo before implantation in the uterus
b. an embryo shortly after implantation in the
uterus
c. a placenta
d. an umbilical cord
e. more than one of these
A
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Why are molecular methods particularly useful for identification of microbes when they are difficult to grow?
A. While all microbes can (and should) be grown for identification purposes, sometimes it's simply faster to use a molecular technique. B. They AREN'T useful-growing a microbe is clearly the only way to properly identify it. C. Since all microbes use DNA, and we can sometimes detect and identify them through even very small amounts of their DNA, molecular methods allow us to identify microbes even when they can't be grown at all. D. Molecular methods are far cheaper methods than growing microbes for identification.
Which statement is false?
a. A molecule is made of at least two atoms. b. Compounds are made of elements. c. Two atoms of oxygen make a molecule of oxygen. d. Proportions of elements in compounds vary according to their source in nature. e. Elements are found in compounds and molecules
________ occurs when human developments break up natural ecosystems into smaller areas
A) Sustainable development B) Habitat fragmentation C) Species invasion D) Conservation biology E) Overexploitation
The Gram-positive bacterium Streptococcus pyogenes has several virulence factors, including the presence of a hyaluronic acid capsule, M protein, streptokinase, and hyaluronidase. Discuss how these factors contribute to this bacterium's ability to cause a variety of diseases.
What will be an ideal response?