The immune system ____
a. works by attacking anything recognized as foreign
b. plays no role in fighting cancer
c. often accelerates development of malignant cancers
d. works by turning off specific genes in an individual's DNA
e. is highly resistant to genetic modification
a
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Which type of modified stems are typical of plants that historically have needed to protect themselves from mammalian herbivores?
A) blades B) tubers C) stolons D) thorns E) rhizomes
Use the following information to answer the following question(s): You wake up one morning feeling slightly under the weather. A close family member enthusiastically suggests that you take some Echinacea, an herb commonly used as a cold remedy. You then decide to design an experiment to test Echinacea and see if this claim is true. You think, "If taken at the beginning of a cold, Echinacea will reduce cold symptoms."You decide to test the effects of Echinacea on 100 people who are experiencing similar cold symptoms. Which of the following groups would represent an appropriate control in your experiment?
A. 100 sick people given tablets similar to Echinacea but with no herb B. One healthy person given Echinacea tablets C. One sick person given Echinacea tablets D. 100 healthy people given tablets similar to Echinacea but with no herb
The nucleosome is a complex of eight histone subunits wrapped by a short DNA strand approximately 10 base pairs long
A. true B. false
Plants remove carbon dioxide from the atmosphere
Indicate whether the statement is true or false