Archaeopteryx lithograpica:
A. was the first fossil directly linking birds to reptiles
B. had a beak with teeth
C. had a small, reptilian breastbone
D. had both claws and feathers on the wings
E. All of the choices provided are true
E. All of the choices provided are true
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Which of the following enzymes is responsible for joining Okazaki fragments together?
A. ligase B. DNA polymerase C. primase D. helicase E. topoisomerase
Dosage compensation refers to the fact that:
A. the level of expression for a given gene is directly related to the number of copies of the gene. B. genes on the Y chromosome must be expressed at higher levels than would otherwise be the case because they are not homologous with genes on the X chromosome. C. genes on the X chromosome must be expressed at lower levels than would otherwise be the case because they are not homologous with genes on the Y chromosome. D. X chromosome genes must be regulated differently in males and females because members of one sex have 2 X chromosomes, whereas members of the other have only 1. E. None of these choices are correct.
The circulatory system of cephalopods is closed, whereas that of all other mollusks is open. Explain
the difference between open and closed circulatory systems, and describe how each system is adequate for the groups possessing it. What will be an ideal response?
More than 100 years ago, Charles Darwin and his colleague Thomas Huxley hypothesized that humans share a common ancestor based on:
a. anatomical evidence. b. evidence gathered during Darwin's voyage on the HMS Beagle. c. manipulative experiments. d. All of the above.