What do the alveoli of mammalian lungs, the gill filaments of fish, and the tracheoles of insects all have in common?

a. They use a circulatory system to transport absorbed O2.
b. Their respiratory surfaces are invaginated.
c. They function using countercurrent exchange.
d. They have a large, thin surface area for gas exchange.
e. All of the listed responses are correct.


Answer: d. They have a large, thin surface area for gas exchange.

Biology & Microbiology

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Answer the following statements true (T) or false (F)

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Biology & Microbiology

How does a positive regulator affect transcription by RNA polymerase in prokaryotes?

A) by allowing passage of the polymerase through an operator B) by interacting with RNA polymerase to increase the frequency of transcription initiation C) by causing the helix to unwind in the operator allowing easier initiation D) by making the transcription start site more exposed to the polymerase

Biology & Microbiology

Which of the following is true about polio?

a. it is an X-linked genetic disease b. it has been virtually eliminated worldwide c. it is a disease that kills motor neurons d. it most frequently affects adults e. all of these are true about polio

Biology & Microbiology

________ is caused by excessive pressure in the aqueous humor

Fill in the blank(s) with correct word

Biology & Microbiology