Consider a cell that has four pairs of chromosomes. What is the number of possible chromosome orientations in that cell?

a. 4
b. 8
c. 16
d. 24
e. 32


Ans: c. 16

Biology & Microbiology

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B and T cells become activated and divide to produce identical cells when _____

a. activated by an antigen b. major histocompatibility genes are expressed c. activated by the presence of cancerous cells d. plasma cells begin to produce and secrete antibodies e. killer T cells bind to any pathogen

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"Double fertilization" produces nutrient tissue by the union of ____

a. two egg nuclei and one sperm nucleus b. two sperm nuclei and one egg nucleus c. two sperm nuclei and two egg nuclei d. one sperm nucleus and endosperm mother cell nuclei e. two sperm nuclei and one endosperm mother cell nucleus

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When cells are not responding to normal controls over growth and division, they form a tissue mass known as a

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Biology & Microbiology