A bacterium living in an underground septic tank thrives by absorbing organic compounds from decomposing wastes. What is it?
A) a chemoautotroph
B) a chemoheterotroph
C) a photoautotroph
D) a photoheterotroph
Answer: B
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A protein called actin consists of 376 amino acids. The mRNA for actin must be longer than
A. 125 nucleotides. B. 376 nucleotides. C. 1128 nucleotides D. 3384 nucleotides.
When signal molecules bind to two tyrosine kinase receptors, the receptors move closer to each other
and form a monomer. __________________ Indicate whether the statement is true or false.
In which animals would diffusion alone not be an effective transport mechanism for gas exchange?
a. nematodes b. sponges c. cnidarians d. annelids e. flatworms
Select the features that are lacking in amphibians but present in reptiles and that confer an advantage to reptiles for living on land.
A. ability to concentrate urine B. egg with an amnion, yolk sac, allantois, chorion, and shell C. skin resistant to water loss D. breathing by buccal pumping