Which of the following evolutionary did not occur during the Mesozoic era?
A. Widespread dinosaurs extinction
B. Giant reptiles were on land an in water
C. First primates were abundant
D. Cycads and ferns were abundant
E. First dinosaurs roamed the earth
C. First primates were abundant
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A catalase-positive, gram-positive bacillus that is not acid-fast, does not branch, and does not form spores could possibly belong to which group of bacteria?
a. Corynebacterium b. Bacillus c. Actinomyces d. Mycobacterium
In conifers, meiosis of diploid cells in an ovule produces ____
a. microspores b. pollen sacs c. pollination droplets d. pollen grains e. megaspores
Over a span of two decades, scientists measured changes in the beak size of a population of Galápagos ground finches. This ________
A) provided evidence of natural selection in action B) is an example of artificial selection C) is an example of overproduction D) led Darwin to his theory of evolution through natural selection
Which of the following is NOT a characteristic of Okazaki fragments?
A) They are checked for accuracy by DNA polymerase III. B) They make up the lagging strand of replicated DNA. C) They begin with an RNA primer. D) They are joined together by DNA ligase. E) They are longer in eukaryotic cells.