A beautiful wood desk you may do your homework on was once a living tree, but after being cut down its tissues died. Now, it only exhibits what property of life?
A. sensitivity
B. organization
C. homeostasis
D. metabolism
Answer: B
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Variations in the timing of master gene expression during embryonic development in vertebrates is responsible for
____.
a. mitochondrial DNA expression b. protein synthesis c. differences in adult body form d. development of vestigial structures e. brain development
Which of the following is able to passively penetrate the plasma membrane (without a transport protein)?
O2 Small charged particles Large polar molecules All of the choices are correct.
What is the function of macrophages during infection by a pathogen?
A. to kill the pathogen by directly damaging its cell membrane B. to phagocytize the pathogen C. to produce antibodies D. all of the above
Which of the following enzyme and its function is mismatched?
A. Reverse Transcriptase-DNA synthesis B. RNA polymerase-synthesizes tRNA C. RNA polymerase-exonuclease activity D. DNA polymerase--proof-reading d. DNA polymerase-exonuclease activity