If both chromatids of a sister-chromatid pair are found in one daughter cell, what has likely occurred?
a. improper replication of DNA
b. failure of maternal and paternal chromosomes to separate
c. nondisjunction during meiosis I
d. nondisjunction during meiosis II
e. an error during crossing-over
ANSWER: d
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Which of the following is true in the moss life cycle?
a. Gametophytes originate within and are dependent upon sporophytes. b. Sporophytes originate within and are dependent upon gametophytes. c. Both gametophytes and sporophytes are totally independent from each other and are equally dominant. d. Gametophytes are free-living and photosynthetic, but are replaced by a dominant sporophyte generation. e. Gametophytes are photosynthetic and partially independent from the sporophytes.
An ancient group of linked brain structures form the ______ system, which is involved in making some activities, like eating or sex, seem pleasurable, while others, like pain or hate, seem stressful.
Fill in the blank(s) with the appropriate word(s)
What type of enzyme seals the newly added (repaired) DNA to the rest of the DNA molecule?
A. ligase B. helicase C. DNase D. primase E. polymerase
All else equal, the theoretical justifications for a particular function form should be stronger in the cases in which you are:
A. attempting to identify correlations only. B. running fixed effects regressions. C. extrapolating further off the support of the data. D. using an instrumental variable.