The polymerase chain reaction (PCR) has advanced our understanding of systematics because it allows for ____
a. analysis of morphological traits
b. analysis of small amounts of DNA from museum specimens and fossils
c. the reconstruction of entire individuals from a small amount of DNA
d. the reconstruction of entire individuals from a small amount of RNA
e. the analysis of an entire genome from a small fossil fragment
ANSWER: b
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Transcriptional regulation in prokaryotes is rapidly turned on or off in response to environmental changes and involves both positive and negative regulators
A. true B. false
A membrane permeable only to water separates two compartments filled with distilled water. Solute is added to one compartment. Osmotic pressure ________
a. all of the choices b. causes the solute to move into the other compartment c. is equal to the amount of force that would need to be applied to that compartment to keep the volume from increasing d. decreases as more solute is added
The integumentary system is responsible for all
EXCEPT which of the following? a. protection against bacterial attack b. prevention of desiccation c. synthesis of a certain vitamin d. blood cell formation e. control of temperature
This mercury-containing chemical was once found in vaccines and thought to cause autism spectrum disorder (ASD)
A) thimerosol B) thalidomide C) PDD-NOS D) thiamin