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

Biology & Microbiology

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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

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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

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The ________ have shells composed of calcium carbonate and thin pseudopods

A) Amebozoa B) Euglenids C) Ciliates D) Dinoflagellates E) Foraminifera

Biology & Microbiology

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

Biology & Microbiology