Select the correct statement about isotopes.
A) Isotopes of the same element have the same atomic number but differ in their atomic masses.
B) All the isotopes of an element have the same number of neutrons.
C) All the isotopes of an element are radioactive.
D) Isotopes occur only in the heavier elements
A) Isotopes of the same element have the same atomic number but differ in their atomic masses.
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Which of the following statements is NOT true of the endocrine system?
A. It influences and is influenced by the nervous system. B. Most of its components are anatomically connected, like most other systems of the body. C. It is composed of glands that secrete chemical messengers into the blood. D. It is one of two major regulatory systems of the body. E. It is an important regulator of homeostatic mechanisms.
The fibrocartilage outer layer of the intervertebral disc is called the
A) annulus fibrosus. B) nucleus pulposus. C) synovial fluid. D) gelatinous pulposus. E) gelatinous fibrosus.
Which of the following structures reabsorbs the most glomerular filtrate?
A. Glomerulus B. Distal convoluted tubule C. Proximal convoluted tubule D. Collecting duct E. Nephron loop
Isotopes have the same ________ number, but a different ________ number.
A. neutron; mass B. mass; atomic C. atomic; proton D. atomic; mass