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

Biology & Microbiology

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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?

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

The substance that is secreted by a bacterial pathogen is known as ___________.

A. exotoxin B. siderophores C. endotoxin D. chlamydia E. Coxiella

Biology & Microbiology