Which of the following has a urinary system that makes use of flame cells?
A) Mollusk B) Earthworm C) Shark D) Bird E) Flatworm
E
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What do you know about the number of neutrons in an atom? How does it relate to the question?
What will be an ideal response?
Hemoglobin
a. tends to give up oxygen in regions where partial pressure of oxygen exceeds that in the lungs. b. tends to hold onto oxygen when the pH of the blood drops. c. tends to release oxygen where the temperature is lower. d. releases oxygen more readily in highly active tissues. e. may bind up to 16 molecules of oxygen.
What would result if a leech had a mutation causing it to secrete low levels of anticoagulants?
A. The pain of the leech bite would cause the leech to be detected. B. The blood would stop flowing after a short time. C. The leech would have a hard time remaining attached to its host. D. The leech would have a hard time locating appropriate hosts.
Which of the following is an example of a proto-oncogene?
gene that codes for CdK BaP cigarette smoke prophase DNA polymerase