A low number of methyl groups associated with a gene encoding a hormone that fosters prenatal growth and
development is common in individuals
a. with cancer.
b. conceived during famine.
c. exposed to chemicals in cigarette smoke.
d. with young parents.
e. of certain ethnic groups.
ANSWER: b
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The visceral mass of molluscs does not contain the
a. circulatory system. b. excretory system. c. nervous system. d. head-foot. e. digestive system.
From the point of view of an angiosperm, what is the function of fruit?
A) It is where the male gametophyte develops. B) It is a mechanism for the dispersal of seeds. C) It provides nutrients to germinating seeds. D) It attracts pollinators.
Which of the following statements concerning B cell receptors (BCRs) is FALSE?
A) They are formed in response to an encounter with an antigen. B) They are complementary in shape to a specific antigenic determinant that they may or may not encounter. C) They are bound to the surface of B lymphocytes and have two antigen-binding sites. D) Each B lymphocyte is randomly generated with antibody variable regions that determine its BCR. E) Scientists estimate that each person forms at least 1011 different types of B lymphocytes with distinct BCRs.
A(n) ________ is a group of cells of similar type that work together to serve a common function
Fill in the blank(s) with correct word