Koch's postulates are criteria used to establish that
A. microbes are found on dust particles.
B. life-forms can only arise from preexisting life-forms.
C. a specific microbe is the cause of a specific disease.
D. microbes can be used to clean up toxic spills.
E. a specific microbe should be classified in a specific kingdom.
Answer: C
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Maximum force is generated by a muscle contraction when:
A. the myofibril is stretched. B. there is excessive overlap between actin and myosin. C. the sarcomere is at intermediate length prior to initiation of contraction. D. intracellular calcium levels are low.
Which of the following structures contains the receptor protein importin?
A) mitochondrion B) nucleolus C) chloroplast D) plastid E) nucleus
Which association is NOT correct?
A. lipid-steroid B. nucleic acid-DNA C. monosaccharide-glucose D. protein-nucleotide
The glands of vertebrates are derived from ________ epithelium.
A. stratified B. scarified C. invaginated D. keratinized E. endocrine