Influenza strains that sweep around the world often carry names such as H5N1 or H2N2. If they are both flu viruses, why do they differ in their H and N numbers?
A. The H and N numbers indicate the type of glycoprotein spikes found in the viral envelope.
B. The H and N numbers indicate the order in which the virus was discovered.
C. The H and N numbers indicate the toxicity of the virus to humans and nonhumans.
D. The H and N numbers indicate the geographical region in which the virus was discovered.
Answer: A
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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
What is the correct order of geological time frames from oldest to most recent?
a. Permian - Triassic - Jurassic - Tertiary
b. Triassic - Jurassic - Tertiary - Permian.
c. Triassic - Permian - Jurassic - Tertiary.
d. Tertiary - Triassic - Permian - Jurassic.
e. Jurassic - Triassic - Permian - Tertiary
Cheetahs exhibit significant inbreeding and loss of heterozygosity due to overhunting and loss of habitat experienced at some point in their evolutionary history
Which genetic mechanism occurs when a large population is substantially reduced at random, acting independently of natural selection? A) founder effect B) mutation C) gene flow D) Hardy-Weinberg equilibrium E) bottleneck effect
Why are new flu shots necessary every year?
A) The antiviral chemicals in flu shots last only 11 months. B) Flu shots do not result in the production of memory cells. C) Depending on the year, either bacteria or viruses cause the flu. D) Flu viruses have a high mutation rate.