Peptide hormones employ ________ that amplify the response of the cell.
Fill in the blank(s) with the appropriate word(s).
second messengers
Peptide hormones employ second messengers that amplify the response of the cell.
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Who am I? I am characterized by having a test and axopods
a. green algae b. actinopods c. opisthokonts d. stramenopiles e. forams
Evidence shows that the earliest life may have existed how long ago?
a. 2 billion years ago b. 3.5 billion years ago c. 1.3 billion years ago d. 630 million years ago e. 250 million years ago
Which of the following does NOT represent a sustainable approach to development?
A) Identifying recycling options in your community and recycling only those things that are accepted B) Installing energy-efficient features, such as good insulation and tight weather stripping, in your house C) Choosing the most fuel-efficient form of vehicle that meets your needs D) Using energy-efficient compact fluorescent or LED bulbs E) Continuing human population growth at current levels
Recently, the bones (not fossils) of a possible new species of humans (in the genus Homo) have been found on an island in Indonesia (an island nation southeast of Asia). Using radiometric dating, scientists can show that these people were alive as
recently as 17,000 years ago. According to the information in this chapter, why do you think they probably used tools? What will be an ideal response?