When RNA polymerase catalyzes the addition of a nucleotide to a growing mRNA chain, a byproduct of this reaction is
A. pyrophosphate.
B. water.
C. orthophosphate.
D. phosphate.
Answer: A
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The semi-fluid matrix that surrounds organelles in a cell is called the:
A. stroma. B. nucleoplasm. C. ribosome. D. cytoplasm.
Which is the simplest of all levels of organization?
A. atom B. cell C. organ D. organism E. population
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
Although the Arctic fox and the kit fox are closely related, they look very different because the individuals
A. acquired traits during their lifetimes that contributed to survival B. with traits most suited to their environments reproduced most successfully C. migrated long distances to environments that most suited their traits D. passed on to their offspring acquired behaviors that were helpful