The length of a butterfly tongue perfectly matches the nectar tube of a flower it pollinates. This is an example of
A) competition.
B) amensalism.
C) phenotypic plasticity.
D) coevolution.
D
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Luke sprained his ankle, tearing some of the collagen protein that forms his ligaments. Some types of collagen consist of three polypeptide chains twisted together to form a rope-like strand. What level of protein structure does this rope-like strand represent?
A. Primary B. Secondary C. Tertiary D. Quaternary
Cloning vectors can be distinguished from expression vectors by
A) carrying ori genes for replication of the cloned sequence. B) having a multiple cloning site (MCS). C) having a high copy number per cell. D) lacking a promoter site upstream of the insertion site.
A(n) ____ is an observed consequence of global climate change
a. more earthquakes b. acid rain c. increase in the ozone hole d. decrease in the ozone layer e. rise in sea level
Nitrogen is a __________ in plants.
Fill in the blank(s) with the appropriate word(s).