The animal phylum with the most species is
(a) Mollusca.
(b) Annelida.
(c) Arthropoda.
(d) Platyhelminthes.
(c) Arthropoda.
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Members of the lineage ____ are called lancelets. As adults they live mostly buried in the sand in
warm, shallow marine habitats, but they do have well-developed segmented muscles and can move.
a. Petromyzontoidea b. Placodermi c. Cephalochordata d. Urochordata e. Myxinoidea
What is the difference between trans- and cis-acting regulatory factors? Design an experiment that allows you to prove your answer to the question
What will be an ideal response?
The protein SOS is a guanine nucleotide exchange factor for Ras. SOS helps facilitate the exchange of GDP for GTP. What would be the effect of a mutation that inhibits the interaction between SOS and Ras?
A. Ras would be more likely to hydrolyze GTP to GDP. B. GDP would remain bound to Ras, thereby preventing Ras activation. C. GTP would remain bound to Ras, thereby keeping Ras constitutively active. D. There would be no effect.
If you are planning on running the regression model given by Tenurei = ?0 + ?1Salaryi + ?2Years of Educationi + Ui, which of the following situations would cause this model to have a limited dependent variable?
A. Everyone in the company earns at least $65,000 a year. B. No one can have negative years of education. C. No one can have negative tenure at the company. D. No one in the company earns more $130,000 a year.