Which of the following is a polygenic trait in humans?
a.) Skin color
b.) Earlobe attachment
c.) Hitchhiker's thumb
d.) Freckles
Ans: a.) Skin color
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Binding of _____ to _____ in DNA can increase the rate of transcription of specific genes
a. activators; promoters b. enhancers; promoters c. repressors; operators d. repressors; promoters e. enhancers; operators
Phytoplankton of the open ocean are very small in order to:
a. avoid detection by grazers. b. maximize their surface area. c. increase their sinking rates. d. none of the above
In the previous unit, you learned about organ systems. Name three organ systems in humans that are affected by the endocrine system. For each organ system named, identify a hormone that influences that system. For each hormone named, describe how the hormone works to alter the organ system.
What will be an ideal response?
Which of these structures is not likely to contain significant amounts of aerenchyma tissue?
A. mangrove pneumatophores B. rice roots C. water lily leaves D. cypress "knees" E. coconut tree roots