Are the three methods of producing the building blocks of life proposed in this chapter mutually

exclusive? What will be an ideal response?


No! There is no reason that the accumulation of life’s building blocks could not be a combination of
lightening-fueled atmospheric reactions, reactions at hydrothermal events and delivery from space. It
is important to recognize that in this case the competing theories can all coexist.

Biology & Microbiology

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Tissues present during development of an organ but not found in the fully formed organ are removed

by

a. apoptosis only. b. programed cell death only. c. molecular signals received by receptors on marked cells only. d. apoptosis and programed cell death. e. apoptosis, programed cell death, molecular signals received by receptors on marked cells.

Biology & Microbiology

Innate immunity begins when ____

a. triggered by adaptive immunity b. PAMP receptors bind to antigen c. white blood cells start dividing d. complement proteins are released e. PAMPs are detected

Biology & Microbiology

Parathyroid hormone and calcitonin both function to regulate _______________

Fill in the blank(s) with the appropriate word.

Biology & Microbiology

What is the evidence for membrane fluidity?

What will be an ideal response?

Biology & Microbiology