What is the term used to define a secondary sexual characteristic in males, such as manes on lions or colorful plumage on peacocks?
A. gene flow
B. fitness
C. sexual selection
D. sexual dimorphism
D. sexual dimorphism
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Girdling is the process by which bark is removed from the entire circumference of a tree or branch. Explain why a
deciduous tree that is completely girdled in mid-summer can retain leaves throughout some or all of the rest of the growing season, but eventually die.
What will be an ideal response?Which of the following organisms is used in
the genetic engineering of plants?
a. E. coli b. T. aquaticus c. A. tumefaciens d. P. flourescens e. B. thuringiensis
Pathogens can use ____ mechanisms to change the host DNA, for example, to change patterns of transcription by the process of methylation
a. pathogenic b. epigenetic c. mutagenic d. enzymatic
The substance that is secreted by a bacterial pathogen is known as ___________.
A. exotoxin B. siderophores C. endotoxin D. chlamydia E. Coxiella