Bacterioplankton (floating bacteria) use ________ as a sulfur source for protein synthesis.
What will be an ideal response?
dimethylsulfonopropionate
DMSP
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Once human nerve cells become mature, they normally exit the cell cycle and remain in ____
a. G0 b. G1 c. G2 d. S phase e. prophase
________ are positively charged particles in the soil that attract anions
Fill in the blank(s) with correct word
The leaflike appendages of moss gametophytes may be one to two cell layers thick. Consequently, which of the following is LEAST likely to be found associated with such appendages?
A) cuticle B) phenolics C) stomata D) peroxisomes
How do scientists calibrate a molecular clock for a group of organisms with known nucleotide sequences?
A) They use radioactive isotopes to measure the age of DNA material directly. B) They graph the number of nucleotide differences against the dates of evolutionary branch points known from the fossil record. C) They analyze fossilized DNA of known age and compare its nucleotide sequences to modern DNA sequences.