Which statement is NOT correct about the results of the Hershey-Chase experiment with the T2 virus?
a. Radioactively labeled protein was found in the bacteria, not in the virus coats.
b. Radioactively labeled DNA was found in the bacteria, not in the virus coats.
c. DNA was labeled with radioactive phosphorus.
d. Protein was labeled with radioactive sulfur.
e. Two separate experiments were actually run, one with radioactive phosphorus and one with radioactive sulfur.
a. Radioactively labeled protein was found in the bacteria, not in the virus coats.
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________ are genetically engineered proteins that allow cytosolic calcium fluxes to be observed by an increase in fluorescence.
Fill in the blank(s) with the appropriate word(s).
Brucella infections usually result in which type of bacteremia?
a. Transient b. Intermittent c. Continuous d. Spontaneous
A population of white-footed mice becomes severely overpopulated in a habitat that has been disturbed by human activity. Sometimes intrinsic factors cause the population to increase in mortality and lower reproduction rates in reaction to the stress of overpopulation. Which of the following is an example of intrinsic population control?
A) Owl populations frequent the area more often because of increased hunting success. B) Females undergo hormonal changes that delay sexual maturation and many individuals suffer depressed immune systems and die due to the stress of overpopulation. C) Clumped dispersion of the population leads to increased spread of disease and parasites resulting in a population crash. D) All of the resources (food and shelter) are used up by overpopulation and much of the population dies of exposure and/or starvation. E) Because the individuals are vulnerable they are more likely to die off if a drought or flood were to occur.
The urochordates are
a. Called tunicates b. Marine animals c. Sessile as adults, but tadpole-like as larvae d. Often abundant in intertidal zones e. All choices are correct