Innate immunity _____
A) is activated immediately upon infection
B) depends on an infected animal's previous exposure to the same pathogen
C) is based on recognition of antigens that are specific to different pathogens
D) is found only in vertebrate animals
A
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To make sure they treat the infection with the correct drug, doctors order DNA fingerprinting of a sample of bacteria taken from the patient for comparison to known fingerprints of strains A, B, and C. With which antibiotic should the patient be treated?
A patient is admitted to the hospital with a mysterious infection. After running some standard tests, doctors believe that the infection is caused by one of three closely—related bacterial strains — A, B, or C — that are hard to treat because they have become resistant to some antibiotics.
Strain A is resistant to antibiotic beta and antibiotic omega
Strain B is resistant to antibiotic alpha and antibiotic omega
Strain C is resistant to antibiotic alpha and antibiotic beta
A. antibiotic alpha.
B. antibiotic beta.
C. antibiotic omega.
D. antibiotic beta or antibiotic omega.
E. any antibiotic will work to kill the bacteria causing the infection.
Answer the question using the accompanying figure. In the internal leaf structure, the structure labeled "2" is ____
a. a vascular bundle b. spongy mesophyll c. epidermis d. a stoma e. palisade mesophyll
In order to test a hypothesis, a scientist would measure which of the following during an experiment?
a. the independent variable b. the dependent variable c. the standard variable d. the constant
Cholesterol can be used as an energy source for the body; where else can it be used?
a. within cell membranes to provide flexibility b. within ribosomes to assist in protein production c. within the nucleus to provide protection for the DNA d. within the nucleus to provide protection for the RNA