The unit structure of chromatin is the ____________________, which is made up of

____________________ types of ____________________ proteins complexed with DNA. Fill in the blank(s) with the appropriate word(s).


ANS: nucleosome; five; histone

Biology & Microbiology

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Despite the enormous amount of solar energy that plants are exposed to, photosynthesis is only able to transform about 1-2% of that energy into stored chemical energy

List three major factors responsible for this phenomenon and explain how each contributes to this inefficiency. What will be an ideal response?

Biology & Microbiology

Which would be more likely to cause illness-a water sample that tested positive for coliforms or one that tested positive for E. coli O157:H7?

A. Both would be equally capable of causing illness-all coliforms cause illness. B. The coliform positive sample would be more likely to cause illness. Coliforms are inherently more pathogenic than the weak O157:H7 lab strain of E. coli. C. The E. coli O157:H7 sample would be more likely to cause illness. This strain of bacterium is highly pathogenic and capable of causing kidney damage. D. Neither-there is usually a small amount of coliforms (including E. coli O157:H7) in all water.

Biology & Microbiology

Research by Malte Andersson suggests the long tail feathers of male African widowbirds are a product of ____

selection because females are more strongly attracted to males with long tails than to males with short tails.

a. disruptive b. intersexual c. intrasexual d. artificial e. stabilizing

Biology & Microbiology

Type I hypersensitivity reactions are also commonly known as (allergies/autoimmunities/inflammation)

What will be an ideal response?

Biology & Microbiology