If many human genes differ in about 10% of their bases from another species' same genes and substitutions occur at an estimated rate of 2% per 1 million years, then about million years have passed since the two species diverged.
A. 20
B. 200,000
C. 3
D. 10
E. 5
E. 5
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What is the type of speciation that can occur in an instant with a change in chromosome number?
a. temporal b. mechanical c. behavioral d. ecological e. sympatric
Which of the following experimental procedures is most likely to speed up mRNA degradation in a eukaryotic cell?
a. removal of one or more exons b. lengthening of the poly-A tail c. removal of the 5' cap d. removal of C nucleotides
Bacteria with DNA described as having "hairpin ends with inverted repeats" must not have circular chromosomes.
Answer the following statement true (T) or false (F)
If the formation of the endoderm does not take place in an embryo, yet the embryo, for whatever reason, continues to develop, which of the following structures will NOT develop?
A) Skin B) Nervous system C) Heart D) Kidneys E) Stomach