Which class contains members that, due to their high activity and resulting need for lots of oxygen, have a closed circulatory system?

a. Bivalvia
b. Scaphopoda
c. Cephalopoda
d. Gastropoda


Ans: c. Cephalopoda

Biology & Microbiology

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A transcriptional repressor contains an amphipathic helix. Which of the following changes within the repressor would most likely disrupt its function?

A. serine to threonine B. aspartate to glutamate C. leucine to valine D. leucine to lysine E. valine to methionine

Biology & Microbiology

When the immune systems no longer distinguishes between self and nonself, _____ can result

a. autoimmunity b. anaphylaxis c. viral infections d. minor allergic reactions e. enhanced immune response

Biology & Microbiology

Discuss the rationale behind taxonomists placing sharks and dolphins in different taxonomic groups, even though they are both aquatic, have very similar body forms, and share other traits as well

What will be an ideal response?

Biology & Microbiology

You decide to go on vacation in the mountains, where you are staying in a cabin. Unfortunately, when you turn on the water in the cabin you smell hydrogen sulfide (H2S) gas. After some research, you find out that the H2S may be due to the presence of sulfur bacteria living in your pipes. What molecule do these bacteria use as an electron acceptor?

A. SO4 B. H2S C. O2 D. H20

Biology & Microbiology