Which of the following were the first vertebrates to truly thrive on land?
A. amphibians
B. birds
C. mammals
D. reptiles
E. fish
Answer: D. reptiles
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In replication, once the DNA strands have been separated, reformation of the double helix is preventedby:a
DNA helicase enzyme. b. single-strand binding proteins. c. DNA polymerases. d. ATP. e. GTP.
When examining the recombination rate across a chromosome, a researcher detects an area of high recombi-nation rates. What could she infer based on this observation?
a. This region is likely the centromere. b. This region is likely a telomere. c. This region is likely an isochore. d. This region is in a protein coding gene. e. None of the above.
________ are tiny chambers within the lungs that allow for gas exchange
Fill in the blank(s) with correct word
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