It is estimated that the modern continents began to take shape
A) 45 million years ago.
B) 250 million years ago.
C) 66 million years ago.
D) 600 million years ago.
Answer: C
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Although transposable elements and short tandem repeats (STRs) are repetitive DNAs, they differ in that _____
A) STRs occur within exons; transposable elements occur within introns B) STRs occur within introns; transposable elements occur within exons C) the repeated unit in STRs is clustered one after another; transposable element repeats are scattered throughout the genome D) the repeated unit in STRs is much larger than the repeated unit of transposable elements
In temperate-zone lakes, a __________ and a fall overturn cause vertical mixing of waters and trigger
a burst of productivity. Fill in the blank(s) with the appropriate word(s).
A porpoise and a dolphin, both mammals, mate and produce an embryo, but the embryo fails to
complete development. This event describes:a. gestational abortion. b. hybrid inviability. c. hybrid breakdown. d. temporal isolation. e. hybrid sterility.
Cell division occurs during the _____ stage
Fill in the blank(s) with the appropriate word(s).