The individuals responsible for constructing the first model of DNA structure were
a. Wallace and Watson.
b. Lamarck and Darwin.
c. Mendel and Meischer.
d. Crick and Watson.
b
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Which event occurs during a strong El Niño year?
a. light rains in the central and eastern Pacific ocean b. upwelling of cold water in the western Pacific ocean c. death of phytoplankton in western coastal areas d. cold surface currents flowing from west to east e. strengthened equatorial winds
An oxygen atom has ____ surrounding a nucleus composed of ____
a. neutrons; electrons and protons b. electrons; protons and neutrons c. protons and electrons; neutrons d. protons; neutrons and electrons e. electrons and neutrons; protons
During the formation of a blood clot, conversion of prothrombin into the enzyme thrombin requires
A) mitochondria. B) transport of proteins from platelets. C) calcium ions. D) leukocytes. E) albumin.
When you cut yourself, the damaged cells immediately release which of the following chemical alarm signals?
A) defensive proteins B) antibodies C) histamine D) antihistamines