Mechanisms of adaptive immunity include ________
A) restriction enzymes B) learning from past exposures
C) blocking phage adsorption D) blocking phage DNA insertion
Answer: B
You might also like to view...
Why have scientists been unable to grow the majority of bacteria and archaea in pure culture in a laboratory setting?
A. Most microorganisms reside in extreme environments that are toxic to human life, so samples cannot be collected for cultivation of the microbial inhabitants in the laboratory. B. Many species have metabolic requirements that are difficult to fulfill in the laboratory. C. DNA sequencing technology was not sufficiently advanced to give scientists the ability to identify prokaryotic species in nature, a requisite for growing microbes in the laboratory. D. Cells with unusual morphological characteristics cannot be grown in the laboratory.
Which of the following is a pair of closely related homologous features?
a. bear paw and bat wing b. bear paw and blue jay wing c. snout of African golden mole and snout of North American mole d. butterfly wing and blue jay wing e. cactus spine and porcupine quill
Which statement regarding stem cells is false?
A) Embryonic stem cells can give rise to all the different specialized cells in the body. B) Adult, but not embryonic, stem cells can be grown in laboratory culture. C) Adult stem cells are present in adult tissues. D) Adult stem cells are partway along the road to differentiation.
Dermatophytoses are
A. fungal infections of the skin, hair, and nails. B. often time-consuming to eradicate completely. C. also called tineas. D. also called ringworm. E. All of the choices are correct.