An extensive system of internal membranes, called the ________, is where carbohydrates and lipids are manufactured and proteins are made that will be exported from the cell.
A. Golgi complex
B. mitochondrion
C. endoplasmic reticulum
D. nucleolus
Answer: C
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Many receptor tyrosine kinase (RTK) pathways lead to the activation of Ras. To activate Ras, it is necessary to recruit a guanine nucleotide exchange factor to the plasma membrane, because Ras is a membrane associated protein. Guanine nucleotide exchange factors, such as SOS, stimulate the exchange of GDP for GTP. However, SOS cannot bind directly to most RTKs. The protein Grb2 has a domain that
can bind to phosphorylated tyrosines, and another domain that can bind to SOS. Therefore, Grb2 can bind to active RTKs and recruit SOS to the plasma membrane. Grb2 is an example of what kind of signaling molecule? A. Scaffold B. Adapter protein C. Second messenger D. Enzyme
The ____ are tropical and subtropical gymnosperms that resemble palms
a. foxtails b. gingkoes c. gnetophytes d. cycads e. conifers
An example of mutualism is:
a. mycorrhizae and epiphytes. b. epiphytes and tapeworms. c. monarch and viceroy butterflies. d. silverfish and army ants. e. Rhizobium and legumes.
Which of the following is NOT a component of a tropical marine community?
A. All of the answers are components of a tropical marine community. B. sunlight C. algae D. corals E. fishes