Cytotoxic T lymphocytes are distinguished from other lymphocytes by the presence of ________.
A. CD4
B. CD8
C. CD19
D. All of the choices are correct.
Answer: B
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How could you verify that a soft-drink container contains diet soft drink rather than soft drink sweetened with fructose?
What will be an ideal response?
Your father has type B blood. Your mother has type O blood. You get tested and learn that your blood
is also type O. What does this tell you?
a. You were adopted and your parents didn't tell you. b. Your mother had a secret affair. c. Your father's genotype is IBi and your mother's genotype is ii. d. Your father's genotype is IBIB and your mother's genotype is ii. e. Your father's genotype is IAIB and your mother's genotype is ii.
What are genes that code for negative cell cycle regulatory proteins called?
a. oncogenes b. tumor suppressor genes c. proto-oncogenes d. mutated genes
Classification. The various energy levels in an atom of magnesium (24Mg) have different numbers of electrons. Use the numbers below to answer the following questions.
A. B. The number of electrons in the first energy level C. The number of electrons in the third energy level D. E. F. The number of electrons in the second energy level