What is an advantage to an organism producing microRNA?
A) microRNA causes mutations in unused genes.
B) microRNA can protect against heart disease and cancer.
C) microRNA can protect against viral infections.
D) microRNA allows for the inactivation of Barr bodies.
C
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Which of the following is not a common posttranscriptional modification of tRNA molecules?
A. removal of nucleotides from the 5' and 3' ends B. methylation and deamination of specific bases C. addition of a 5' cap D. attachment of the C-5 of uracil to the ribose at specific sequences
To determine a geographic area's climate, what variable conditions must be taken into account?
A) distance from the equator and available sunlight B) altitude and bodies of water C) temperature and precipitation D) air quality and urbanization
________ can be defined as the fraction of the variation in a population that is due to differences in genes
Fill in the blank(s) with correct word
According to the principle of competitive exclusion, two species cannot continue to occupy the same:
a. ecological niche b. environmental habitat c. range d. biome e. territory