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NYS Regents

NEW YORK STATE REGENTS EXAMS
LIVING ENVIRONMENT - JUNE 2001

19 Which statement best explains the significance of meiosis in the process
of evolution within a species?

(1) The gametes produced by meiosis ensure the continuation of
any particular species by asexual reproduction.
(2) Equal numbers of eggs and sperm are produced by meiosis.
(3) Meiosis produces eggs and sperm that are alike.
(4) Meiosis provides for variation in the gametes produced by an
organism.

20 The diagram below represents chromosomes in a zygote.

Which diagrams best illustrate the daughter cells that result from normal
mitotic cell division of this zygote?


 

21 During the last months of pregnancy, the brain of a human embryo undergoes an essential "growth spurt.” Which action by the mother would most likely pose the greatest threat to the  normal development of the nervous system of the embryo at this time?

(1) spraying pesticides in the garden
(2) taking prescribed vitamins on a daily basis
(3) maintaining a diet high in fiber and low in fat
(4) not exercising

22 The diagram below illustrates a biochemical process that occurs in organisms.

The substance labeled “catalyst” is also known as

(1) a hormone         (3) an antibody
(2) an enzyme        (4) an inorganic compound
 

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