Human influenza viruses are usually derived from influenza viruses that infect

A. horses and sheep.
B. cattle and water buffalo.
C. a variety of primates.
D. birds and pigs.
E. chimpanzees and gorillas.


D. birds and pigs.

Biology & Microbiology

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In the early twentieth century, ____ discovered that genes are carried on chromosomes

a. Thomas Hunt Morgan b. Francis Crick c. Gregor Mendel d. James Watson e. Thomas Huxley

Biology & Microbiology

Plant cells called ____ make up the bulk of the soft primary growth of roots, stems, leaves, flowers, and fruits

a. sclerenchyma b. tracheids c. collenchyma d. parenchyma e. vessel members

Biology & Microbiology

When a plant zygote first forms, it starts to develop and elongate after mitosis begins

a. True b. False

Biology & Microbiology

When you feel threatened, the

neurotransmitter, ___, is released from ___ neurons and your response is to fight or flee.

a. acetylcholine--sympathetic b. acetylcholine--parasympathetic c. norepinephrine--sympathetic d. serotonin--sympathetic e. serotonin--parasympathetic

Biology & Microbiology