Which of the following is NOT an autoimmune disease?
a. type I diabetes
b. rheumatoid arthritis
c. hepatitis
d. lupus
e. multiple sclerosis
C
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The process of human X-chromosome inactivation in female cells:
A. is more common for the paternal X chromosome than the maternal X chromosome. B. condenses one copy of the X chromosome into heterochromatin. C. is necessary to ensure that only Y chromosome genes are expressed in some cells. D. All of the choices are correct.
Which of the following extraembryonic membranes
forms fingerlike projections that become part of the placenta? a. amnion b. yolk sac c. chorion d. allantois e. none of these
A ?COOH group is a(n) ____ group
a. carboxyl b. hydroxyl c. amine d. methyl e. carbonyl
How do restriction enzymes work?
1.They recognize sticky ends and quickly restrict their binding. 2.They recognize and cut only specific sequences going backwards and forwards in the DNA. 3.They help to paste DNA from different organisms into cloning vectors. 4.They restrict plasmids from being taken up by host cells.