The four elements that make up more than 96% of the weight of living organisms are oxygen, carbon, hydrogen and
calcium.
Indicate whether the statement is true or false.
ANSWER: False - oxygen, carbon, hydrogen and nitrogen
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Interferons function to make cells
A. prevent viral replication. B. lyse when exposed to virus. C. non-motile when infected with virus. D. resistant to phagocytosis.
Which sequence of the cell cycle is correct?
a. prophase, metaphase, interphase, telophase, anaphase b. prometaphase, anaphase, prophase, telophase, interphase, metaphase c. anaphase, interphase, telophase, prometaphase, prophase, metaphase d. interphase, prophase, prometaphase, metaphase, anaphase, telophase e. interphase, metaphase, prometaphase, prophase, telophase, anaphase
Which nutrients often limit the distribution and abundance of photosynthetic organisms?
A) water and oxygen B) nitrogen and phosphorus C) carbon dioxide and nitrogen D) water and carbon dioxide
The outer membrane of Gram-negative bacteria
A) is a rigid, protective outer shell. B) is also referred to as endotoxin and stimulates fever and shock. C) is the site of nutrient exchange and allows sizes and shapes of molecules to pass through it. D) has the same chemical composition as the cell membrane.