Which is an anaerobic excavate that is an endosymbiont of animals?
a. diatom
b. euglenoid
c. parabasilid
d. actinopod
e. dinoflagellate
c
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Which one of the following statements correctly describes features shared by simple multicellular eukaryotes?
A. Cells adhere to one another, most of the cells are capable of a wide range of functions, including reproduction, and the loss of one or more cells usually does not lead to the death of the organism. B. Cells adhere to one another and engage in extensive communication with one another; most of the cells are capable of a wide range of functions, including reproduction; and the loss of one or more cells usually does not lead to the death of the organism. C. Cells adhere to one another and most of the cells are capable of a wide range of functions except the ability to reproduce, which means that the loss of certain cells usually leads to the death of the organism.
Human pathogens are classified as
A) thermoduric. B) thermophiles. C) mesophiles. D) hyperthermophiles. E) psychrophiles.
Cells are typically small because _____.
A) a greater number of small cells can occupy any space compared to larger cells B) just like sand and gravel, smaller objects can pack together more tightly C) their volumes increase at a faster rate than the surface area D) small cells require less food than large cells
Of the following mutations, which are likely to cause cell-cycle arrest? If you predict a cell-cycle arrest, indicate whether the cell will arrest in early G1, late G1, or G2. Explain your answers
A. a mutation in a gene encoding a cell-surface mitogen receptor that makes the receptor active even in the absence of the mitogen B. a mutation that destroyed the kinase activity of S-Cdk C. a mutation that allowed G1-Cdk to be active independently of its phosphorylation status D. a mutation that removed the phosphorylation sites on the Rb protein E. a mutation that inhibited the activity of Rb