A(n) ____ is a group of neighboring populations that exchange individuals
a. K-selected species
b. Type I species
c. r-selected species
d. sink population
e. metapopulation
ANSWER: e
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Which of the following do sticky ends and nucleic acid probes have in common?
A. They both are used as gene vectors in genetic engineering. B. They both involve complementary base pairing. C. They both are parts of RNA molecules. D. They both are produced by the action of restriction enzymes. E. They both are important aspects of bacterial sex.
When acetyl-CoA containing radioactively labeled carbon atoms is fed to cells, the CO2 produced is not initially radioactive. However, molecules of citrate and oxaloacetate are radioactive. Only after some time has passed will radioactive CO2 be released. What is the best explanation for this observation?
A. Acetyl groups are not metabolized directly into CO2, but enter a cyclical metabolic pathway. B. Acetyl groups first combine with citrate and oxaloacetate before being metabolized into CO2. C. Acetyl groups are not metabolized directly into CO2, but enter a linear metabolic pathway. D. Acetyl groups are metabolized directly into CO2.
Which of the following occurs during gastrulation?
a. formation of the gray crescent region b. formation of ectoderm, mesoderm, and endoderm c. closure of the archenteron d. formation of the blastocoel e. radial cleavage takes place
A 45-year-old diabetic has entered the hospital. Routine blood work shows that his blood pH is dropping and is currently at 7.3 (normal blood pH is about 7.4). Explain what could be occurring in the kidneys to cause a drop in blood pH. If the acidosis
cannot be reversed quickly, what type of immediate treatment might the patient need to restore kidney function? There are two types of this treatment. How do they differ from each other? What sorts of complications might be expected? What will be an ideal response?