Which of the following are primary lymphoid tissues?
A) thymus and lymph nodes
B) lymph nodes and spleen
C) spleen and mucosa-associated lymphoid tissue
D) thymus and bone marrow
E) bone marrow and mucosa-associated lymphatic lymphoid tissue
Answer: D
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Look at the illustration and think about what you have learned about the regulation of the cell cycle. If Rb were mutated and could not be phosphorylated or bind E2F, which would be a possible outcome?
a. E2F would bind and transcription would proceed.
b. Rb would block transcription and apoptosis would be triggered.
c. Cancer would result due to unchecked cell growth and mitosis.
d. Transcription would be blocked and the cell cycle could not proceed.
The chi-square value is the sum for all progeny classes of (observed-expected)2/expected. Using the chi-square test for goodness of fit, calculate the chi-square value to test the null hypothesis that genes C and D are unlinked. What is the chi-square value?
A dihybrid testcross is made to determine if genes C and D are linked. The results are shown in the table.
A) 0
B) 0.0576
C) 10.8
D) 14.4
E) cannot be determined
The primary immune response can take up to ____ for the antibody to peak, whereas the secondary immune response can take up to _____ for the antibody to peak.
What will be an ideal response?
A decrease in ________ is followed by the gradual degradation of the corpus luteum
A) LH B) FSH C) estrogen D) progesterone