Free radicals contain unpaired electrons in their outermost energy shell, so they react readily with other atoms or molecules to reach a more stable state. Which of the following could potentially be a free radical?
A) Magnesium (atomic number 12 ) B) Neon (atomic number 10 )
C) Helium (atomic number 2 ) D) Fluorine (atomic number 9 )
D
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A "5? cap":
a. prevents translation. b. prevents the binding of ribosomes. c. marks the mRNA for degradation. d. is added to mRNA but not pre-mRNA. e. protects mRNA from degradation.
Complement is a collection of
A) phagocytic cells that consume virus-infected body cells. B) antibodies. C) nonspecific antigens. D) blood proteins that assist antibodies. E) antibiotics.
Match the letter of each example from childbirth to the appropriate component of a positive feedback loop.A. pituitary gland secretes oxytocin, which acts on the uterusB. uterine contractions increaseC. fetus is pushed against uterine openingD. receptors detect stretchE. brain receives and compares stretch informationResponse
What will be an ideal response?
Contamination with ________ is a concern because they are highly resistant to killing.
A. archaea B. endospores C. pleomorphs D. vegetative cells E. vibrios