Carbon has an atomic number of 6. This means it has 6 protons and 6 electrons. How many valence electrons does carbon have?
a. 2
b. 6
c. 4
d. 3
c. 4
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Individuals with an XXY karyotype are ________ in humans and ________ in fruit flies.
A) male; male B) male; female C) female; male D) female; female E) male; intersexual
The concentration of oxygen is lower at high altitudes. Why would this make it harder for a person to get enough oxygen into their blood?
A. Hemoglobin cannot bind oxygen well at low concentrations. B. The concentration gradient from the alveoli to the blood decreases. C. People are working harder at high altitudes and have higher demands for oxygen. D. The concentration of oxygen in the blood is too low for diffusion into tissues. E. The heart cannot obtain enough energy to pump oxygen into the blood from the alveoli.
Which of the following is false concerning the
atom in the figure? a. The number of protons and the number of electrons are equal. b. It has an atomic mass of 4. c. Electrons are moving around the nucleus. d. It has an atomic number of 2. e. The number of electrons exceeds the number of protons.
Fossils like Archaeopteryx offer evidence linking
A. reptiles and mammals. B. amphibians and reptiles. C. birds and mammals. D. birds and dinosaurs. E. fish and amphibians.