Which of the following are true statements about the carbon cycle? Check all that apply.  

_____  Carbon and nitrogen fixation are both facilitated by microbes.
_____  Burning of gasoline is a contributor to the current imbalance in the carbon cycle.
_____  Replacing rainforest with farms decreases atmospheric CO2 levels.
_____  In water, inorganic carbon exists in two different forms, both of which can be used by autotrophs.
_____  Carbon cycles locally.


__X__  Carbon and nitrogen fixation are both facilitated by microbes.
__X__  Burning of gasoline is a contributor to the current imbalance in the carbon cycle.
_____  Replacing rainforest with farms decreases atmospheric CO2 levels.
__X__  In water, inorganic carbon exists in two different forms, both of which can be used by autotrophs.
_____  Carbon cycles locally.

Biology & Microbiology

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Plants have collections of totipotent stem cells called ____

Fill in the blank with the appropriate word.

Biology & Microbiology

Refer to the accompanying figure. Which cell type or types are primarily responsible for the release of histamine in

injured tissues and in allergic responses? a. A only b. B only c. C only d. D only e. A and cell type D

Biology & Microbiology

Which of the following is the correct sequence of blood flow in reptiles and mammals?

Biology & Microbiology

The antibiotic chloramphenicol binds to the 50S subunit of the ribosome as shown in Figure 20.3. The effect is to

a. Prevent attachment of tRNA. b. Prevent peptide bond formation. c. Prevent transcription. d. Stop the ribosome from moving along the mRNA. e. Prevent polypeptide formation in eukaryotes.

Biology & Microbiology