Programmed cell death, or apoptosis, is a necessary and useful property of cells. Why is this so?
What will be an ideal response?
It is useful for multicellular organisms to have the ability to have some cells selectively self-destruct. Cells that have become irreparably genetically damaged, are infected by viruses, or have completed their developmental role may pose a danger to the organism if they live.
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Alkylating agents, such as ethylmethane sulfate (EMS), are mutagens because they
A) promote deletions and insertions. B) remove amine groups. C) add hydroxyl groups to bases. D) add ethyl or methyl groups to bases. E) fit between stacked bases and disrupt replication.
Innate motor program.
Choose the letter of the best match: A. cognition B. waggle dance C. navigation D. filial imprinting E. fixed action pattern
The breathing center is located in the ________ of the brain and is responsible for the basic breathing rhythm
Fill in the blank(s) with correct word
Which of the following is NOT an example of a heterotroph?
a) mushroom. b) leopard. c) grass. d) human.