The presence of rust in fossilized rock samples from >3 billion years ago is believed to be evidence of what?

a. an increase in stromatolites
b. an increase in animal diversification
c. an increase in photosynthesis
d. and oxygen-poor atmosphere
e. A and D


Answer: c. an increase in photosynthesis

Biology & Microbiology

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The use of transposons to generate mutations is a convenient way to create bacterial mutations in the laboratory

Indicate whether the statement is true or false.

Biology & Microbiology

Sponges (phylum: Porifera) are animals that possess feeding cells called collar cells. These cells have a central flagellum surrounded by a collar of microvilli. The collar filters organic matter out of the water column. Which protist shares a more recent common ancestor with the poriferans?  

A.  Ciliates B.  Rhodophyta C.  Choanoflagellates D.  Radiolarians E.  Myxomycota Clarify Question · What is the key concept addressed by the question? · What type of thinking is required?   Gather Content · What do you already know about Porifera? How does it relate to the question?   Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?   Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?

Biology & Microbiology

Which of the following is NOT TRUE of

photolysis? a. It is a function of the cyclic pathway. b. It involves photosystem II. c. It occurs in the light-dependent reactions. d. It is the source of oxygen in photosynthesis. e. It directly replaces electrons lost by p680

Biology & Microbiology

What would be the approximate equilibrium potential for K+ if K+ outside the neuron is 1mM and inside is 100mM? How might that impact the resting potential compared to that for a typical neuron?

What will be an ideal response?

Biology & Microbiology