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.
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Plants have collections of totipotent stem cells called ____
Fill in the blank with the appropriate word.
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
Which of the following is the correct sequence of blood flow in reptiles and mammals?
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.