The molecular mechanism that produces genomic imprinting by inactivating an allele involves ____ of
DNA in the allele that will not be expressed.
a. methylation
b. mutation
c. ligation
d. deletion
e. inversion
A
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The half-life of Carbon-14 is approximately 5,700 years. Using this information scientists have been able to determine the age of some artifacts left by humans. A scientist wants to know approximately how old a piece of wood was that she found on the floor in an old cave that had recently been discovered. She removed the wood (with permission) to her laboratory. Her wood sample contained 2 grams
of Carbon-14 . If the age of the wood was determined to be 22,800 years old, how much Carbon-14 originally existed in this piece of wood? A. 32 grams B. 16 grams C. 12 grams D. 8 grams E. 4 grams
Refer to Figure 44-1 in the book. To which group are sponges more closely related?
A. choanoflagellates B. bilaterians C. equal relationship to both choanoflagellates and biletarians
Which organism appears green on TCBS agar and is halophilic?
a. V. cholerae b. V. harveyi c. Vibrio fluvialis d. V. vulnificus
If we are only able to observe a population’s phenotypes, which frequencies of genotypes can we know?
a. both homozygous dominant and recessive b. only homozygous dominant c. only homozygous recessive d. both homozygous and heterozygous