Which hormone plays a central role in all aspects of plant development and is made mainly in shoot apical meristems and in young leaves?
a. abscisic acid
b. gibberellin
c. auxin
d. cytokinin
e. ethylene
c
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In nature, the predominant form of DNA is supercoiled in a negative direction
Indicate whether the statement is true or false.
Which are evolutionary modifications that improve the survival and reproductive success of an organism?
a. mutations b. adaptations c. artificial traits d. homoplastic traits e. vestigial structures
Map units on a linkage map cannot be relied upon to calculate physical distances on a chromosome because
A) the frequency of crossing over varies along the length of the chromosome. B) the relationship between recombination frequency and map units is different in every individual. C) physical distances between genes change during the course of the cell cycle. D) the gene order on the chromosomes is slightly different in every individual. E) all of the above
The genus Arthrobacter has a distinctive growth cycle in which branched rod-shaped bacteria are produced in the exponential phase, and cocci are found in stationary phase cultures.
Answer the following statement true (T) or false (F)