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NYS Regents

NEW YORK STATE REGENTS EXAMS
LIVING ENVIRONMENT - JANUARY 2002

16 A characteristic of mutations is that they usually

(1) are caused only by the events of mitosis
(2) do not occur at random
(3) result in different genetic sequences
(4) occur to meet the needs of a species

17 Regulation of sexual reproductive cycles of human males is related most
directly to the presence of the hormone

(1) estrogen                (3) testosterone
(2) progesterone        (4) insulin

18 The nucleus is removed from a body cell of one organism and is placed in an egg cell that has had its nucleus removed. This process, which results in the
production of organisms that are genetically alike, is known as

(1) cloning
(2) fertilization
(3) biological adaptation
(4) DNA production

19 Most cells in the body of a fruit fly contain eight chromosomes. In some cells, only four chromosomes are present, a condition which is a direct result of

(1) mitotic cell division
(2) meiotic cell division
(3) embryonic differentiation
(4) internal fertilization

20 People with AIDS are unable to fight multiple infections because the virus  that causes AIDS

(1) weakens their immune systems
(2) produces antibodies in their blood
(3) attacks muscle tissue
(4) kills pathogens


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