Regarding atoms, identify which statement below is correct.
a. An element may be composed of several types of atoms.
b. The nucleus of an atom contains protons and electrons.
c. The number and arrangement of electrons in an atom governs its chemical activity.
d. The positive charges of an element are carried by the electrons.
e. The neutral charges of an element are carried by the protons.
Ans: c. The number and arrangement of electrons in an atom governs its chemical activity.
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Which of the following is NOT a line of evidence that Kingdom Animalia is a monophyletic group?
a. The ribosomal RNA of animals is more similar to that of other animals than it is to any other form of life. b. Animals share unique similarities in their cell-to-cell junctions. c. All animals have the same genetic code. d. Animals share similarities in the molecules in their extracellular matrices. e. All animals have bilateral symmetry.
Which of the following events occurs in lung blood?
a. Free H+ binds to hemoglobin. b. Plasma HCO3 ? enters erythrocytes. c. In the plasma, CO2 and H2O are converted into HCO3 ? and H+. d. In erythrocytes, carbonic anhydrase converts CO2 and H2O into HCO3 ? and H+. e. CO2 binds to hemoglobin.
Mendel observed that some genetic traits seemed to mask others in the pea plants, and used the term ___ to describe these traits.
a. dominant b. homologous c. heterozygous d. recessive e. homozygous
In the absence of oxygen, suppose a single yeast cell undergoes fermentation and uses 100 molecules of glucose. How many molecules of ATP will be generated?
A) 100 B) 200 C) 300 D) 400 E) 36