What is similar about G protein-coupled receptors (GPCRs) and receptor tyrosine kinases (RTKs)?

A. Both can activate phospholipase C
B. Both are activated by autophosphorylation
C. Both are enzymes
D. Both are directly bound to G proteins


Answer: A

Biology & Microbiology

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Put the following stages of the phosphorus cycle in the proper order:

A. Feces and urine are released from animals into soil. B. Phosphorus is plentiful in rocks and soil. C. Phosphorus goes from rivers into the ocean. D. Phosphorus goes from soil into rivers. E. Phosphorus goes to higher trophic levels. F. Following uplifting, plants take in phosphorus. G. Ocean floor experiences an uplifting and releases phosphorus. 1. First stage 2. Second stage 3. Third stage

4. Fourth stage 5. Fifth stage 6. Sixth stage 7. Seventh stage

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Which of the following is not a part of the male genital (reproductive) system?

A. Epididymis B. Vas deferens C. Prostate D. Ureter

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These birds resemble each other, but live in vastly different geographic areas. What is their evolutionary relationship?

1.They cannot be related if they lived on different continents. 2.They are vestigial forms of one another. 3.They resemble each other outwardly but are very different internally. 4.They all had a common ancestor.

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Rhythmic leaf folding is a type of __________, an

event repeated on a 24-hour cycle. Fill in the blank(s) with the appropriate word(s).

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