When in its life cycle does a B cell first exhibit its particular surface antigen receptor?
A) after the memory cell giving rise to it divides
B) before it ever encounters an antigen
C) after it encounters several antigens
D) after it encounters a single antigen
B
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How many molecules of ATP are needed to reduce one molecule of carbon dioxide to carbohydrate by oxygenic phototrophs during the dark reactions of photosynthesis?
A. 10-12 B. 2 C. 4 D. 3
Huntington’s disease is a dominant autosomal
genetic disorder. Albert has Huntington’s disease as did his mother. His father was normal. Albert is married to Lydia who does not have Huntington’s disease. If Albert and Lydia have a child, what is the probability that their child will have Huntington’s disease?
a. 0% b. 25% c. 50% d. 75% e. 100%
Diversity often decreases during the later stages of succession
Indicate whether the statement is true or false
The passageway that channels ova from the ovary into the uterus is known as
a) a vagina b) a uterus c) a fallopian tube d) an endometrium e) a cyst