What DNA modifications characterize epigenetic marks?

What will be an ideal response?


Attachment of methyl groups to cytosine nucleotides in DNA, or other similar chemical modifications to DNA.

Biology & Microbiology

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The solar system formed ____ billion years ago

a. 4 b. 5 c. 6 d. 7 e. 8

Biology & Microbiology

The squid in this photograph contains a colony of Vibrio fischeri bacteria, which only luminesce while living within a squid. How is this behavior beneficial for V. fischeri bacteria?



a. Bioluminescent squid are more visible to free-floating V. fisheri bacteria, allowing them to join the colony.
b. Bioluminescent squid attract specific predators, allowing V. fischeri colonies to spread more rapidly.
c. Bioluminescent squid are less likely to be consumed by predators, protecting V. fischeri’s source of food.
d. Bioluminescence within squid provides ample light for V. fischeri to synthesize glucose via photosynthesis.

Biology & Microbiology

Nitrogen-fixing bacteria receive _______ from the plant in a mutually beneficial relationship.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Upwelling increases ______________ which can result in red tides.

a) viral load in plankton b) nutrient availability c) temperature d) stratification

Biology & Microbiology