Immature B lymphocytes undergo clonal deletion in the bone marrow.
Answer the following statement true (T) or false (F)
True
Biology & Microbiology
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The seed coat is formed by the hardening of the
A. ovule. B. integument. C. endosperm. D. embryo. E. prothallus.
Biology & Microbiology
The diameter of a blood vessel will be reduced by the contraction of ________
a. cardiac muscle b. smooth and cardiac muscles c. skeletal and cardiac muscles d. smooth muscle e. skeletal muscle
Biology & Microbiology
The time that it takes for half of a radioactive isotope to change into another stable element is its
A. chemical life cycle. B. half-life. C. activation time. D. life span.
Biology & Microbiology
Adenylyl cyclase has the opposite effect of which of the following?
A) protein kinase B) protein phosphatase C) phosphodiesterase D) phosphorylase
Biology & Microbiology