What does the Keeling curve show?
What will be an ideal response?
Amount of carbon dioxide in the atmosphere
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A C. elegans with a heterochronic mutation in lin-14 will lay eggs normally
Indicate whether the statement is true or false
Standing still and at attention for long periods can result in inadequate venous return. The effects of this can be seen when even young and healthy soldiers sometimes faint when standing at attention for long periods. Which of the following is NOT occurring to promote return of blood from the venous system in this situation?
A. sympathetic activation of smooth muscle in large veins B. skeletal muscle activity compressing veins and forcing blood flow C. one way flow in the venous system due to valves D. ventricular contraction E. None of the choices for this question are correct.
Each intact ribosome consists of a large and a small subunit made mostly of catalytic rRNA. A ribosome also consists of:
a. structural proteins b. free amino acids c. DNA d. lipids e. enzymatic proteins
In the Hershey and Chase experiment, the pellet was radioactive after bacteria had been infected with
32P-labeled viruses and centrifuged. Why?
a. Bacteria were centrifuged to form the pellet, and they had incorporated radioactive proteins into their DNA. b. Bacteria were centrifuged to form the pellet, and they had incorporated radioactive DNA. c. Viruses were centrifuged to form the pellet, and they had incorporated radioactive proteins from the bacterial DNA. d. Bacteria were centrifuged to form the pellet, and they had incorporated radioactive proteins into their cell membranes. e. Viruses were centrifuged to form the pellet, and they had incorporated radioactive DNA.