What process delivers organic nutrients to abyssal plains and trenches near continental shelves?
a. Decomposition
b. Biological magnification
c. Turbidity currents
d. Marine snow
c
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Protein kinase is an enzyme that _____
A) functions as a second messenger molecule B) serves as a receptor for various signal molecules C) activates or inactivates other proteins by adding a phosphate group to them D) produces second messenger molecules
The placenta develops from the endometrium while the fetus develops from embryonic tissue.
Answer the following statement true (T) or false (F)
In the 1920s, Frederick Griffith conducted an experiment in which he mixed the dead cells of a bacterial strain that can cause pneumonia with live cells of a bacterial strain that cannot. When he cultured the live cells, some of the daughter colonies proved able to cause pneumonia. Which of the following processes of bacterial DNA transfer does this experiment demonstrate?
A) transduction B) conjugation C) transformation
Which technology was first established by Cro-Magnon?
Select one: a. throwing spears b. scrapers c. controlled fire d. group life e. All of the answer choices are correct.