Which one of the following is a characteristic of the adaptive immune system?
A. it acts immediately or within hours of appropriate stimulus
B. it involves granulocytes (myeloid white blood cells)
C. its response is enhanced on repeated exposure to antigen/pathogen
D. it involves one type of large, granular lymphocytes also known as natural killer cells
E. it involves macrophages
Ans: C. its response is enhanced on repeated exposure to antigen/pathogen
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Where do the microtubules of the spindle originate during mitosis in both plant and animal cells?
A) centromere B) centrosome C) centriole D) chromatid E) kinetochore
Sodium-potassium pumps transport ___________.
A) sodium ions (Na+) and potassium ions (K+) into a neuron B) sodium ions (Na+) and potassium ions (K+) out of a neuron C) sodium ions (Na+) out of a neuron and potassium ions (K+) into a neuron D) sodium ions (Na+) into a neuron and potassium ions (K+) out of a neuron E) both sodium ions (Na+) and potassium ions (K+) into and out of a neuron
An electrically charged molecule or atom is a(n) ________
Fill in the blank(s) with correct word
Which of the following is TRUE concerning
the C4 pathway? a. It produces large amounts of carbohydrates. b. It feeds into the C3 pathway. c. It is the mechanism of photorespiration. d. It involves the activity of rubisco. e. All of these are true