In multicellular organisms, the coordination of cellular activities relies on
A) cell receptors that detect transcription factors.
B) the availability of certain "key" nutrients as cells divide.
C) operons.
D) cell-to-cell signaling and signal transduction pathways.
Answer: D
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The proportion of the air we breathe accounted for by oxygen is approximately ___%.
A. 21 B. 1 C. 5 D. 50 E. 78
At least two host races of apple maggots have appeared within the past 150 years, suggesting they may be undergoing
____.
a. parapatric speciation b. allopatric speciation c. sympatric speciation d. genetic drift e. development of a hybrid zone
The ________ have shells composed of calcium carbonate and thin pseudopods
A) Amebozoa B) Euglenids C) Ciliates D) Dinoflagellates E) Foraminifera
The following coat colors are known to be determined by alleles at one locus in horses:
palomino = golden coat with lighter mane and tail cremello = almost white chestnut = brown The following table gives ratios obtained in matings of the above varieties: Cross Parents Offspring 1 cremello x cremello all cremello 2 chestnut x chestnut all chestnut 3 cremello x chestnut all palomino 4 palomino x palomino 1/4 = chestnut 1/2 = palomino 1/4 cremello Assign gene symbols for the genetic control of coat color on the basis of these data. A) C1C1 = cremello, C2C2 = chestnut, C1C2 = palomino B) C1C1 = chestnut, C2C2 = palomino, C1C2 = cremello C) C1C1 = palomino, C2C2 = chestnut, C1C2 = cremello D) C1C1 = palomino, C2C2 = cremello, C1C2 = chestnut E) C1C1 = chestnut, C2C2 = cremello, C1C2 = palomino