Plants having the ability to take up organic nitrogen are most likely to be found in the ____
a. arctic tundra
b. salt marsh
c. tropical forest
d. grassland
e. temperate forest
ANSWER: a
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During transcription
a. double-stranded RNA chains are produced. b. the entire DNA molecule is used. c. primase creates an RNA primer to start the RNA strand. d. only one of the two DNA strands acts as a template. e. protein is made from RNA.
Which choice best describes the main idea behind using the lod method to determine if genes are linked?
1.Linked genes that are farther apart are more likely to be separated by crossing over, so genetic map units are derived from recombination frequencies. 2.The lod score is the log10 of the ratio of the two probabilities that results are either consistent with linkage or that they are not. 3.Software is used to calculate the probability, or lod score, that the observed frequency of recombination is consistent with linkage. 4.One lod map unit is equal to a 10% frequency of recombination.
Redwood trees are the tallest land plants that are members of the group known as conifers. Which of the following are features that are shared by all redwood trees?
A. Cell walls containing cellulose B. Leaves that have a cuticle C. Vascular tissue containing lignin D. Flowers E. Answers A and B F. Answers A, B, and C G. Answers A, B, C, and D
A nucleotide is made of _______
a. sugar + phosphate b. sugar + phosphate + nitrogen base c. sugar + nitrogen base d. phosphate + nitrogen base