Select all of the following that are components of the thoracic (rib) cage.
A. sternum
B. thoracic vertebrae
C. sacrum
D. ribs
E. lumbar vertebrae
Ans: B, C & D.
B. thoracic vertebrae
C. sacrum
D. ribs
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Stromatolites are
A. layered rocklike structures formed by some cyanobacteria (blue-green algae). B. the earliest known arthropods. C. found only in rocks of Carboniferous age. D. the earliest known arthropods and found only in rocks of Carboniferous age are correct. E. fossilized coral reefs.
If the DNA sequence is ATG-CGT, the mRNA codons are
a. AUG-CGU. b. ATG-CGT. c. UAC-GCA. d. UAG-CGU. e. GUA-CGU.
The endomembrane system did not start developing until the atmosphere was ____
a. high in oxygen, high in carbon dioxide b. high in hydrogen, low in oxygen c. changing from low oxygen to high oxygen levels d. firmly in the age of aerobes e. low in hydrogen, low in oxygen
Human MN blood types illustrate the Hardy Weinberg principle because these blood type antigens are not subject to
inheritance. ______________ Indicate whether the statement is true or false.