Which of the following statements is NOT
true?
a. All isotopes of an element have the same
number of electrons.
b. All isotopes of an element have the same
number of protons.
c. All isotopes of an element have the same
number of neutrons.
d. All radioisotopes are unstable.
e. All isotopes of an element have the same
atomic number.
C
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The virulence of this organism(s), which is transmitted via a dog bite, is attributed to:
a. protease production. b. various toxins. c. hemolysins. d. something unknown.
Guard cells
a. surround the stoma. b. control the opening to the interior of the leaf. c. become swollen when it becomes light, if environmental conditions are not too hot or dry. d. absorb water from surrounding epidermal cells. e. do all of these
Which structure of the virus in the accompanying figure is the capsid?
a. 1
b. 2
c. 3
d. 4
e. 5
Biologists now routinely test for homology between genes in different species. If genes are determined to be homologous, it means that they are related _____
A) by descent from a common ancestor B) because of convergent evolution C) by chance mutations D) in function but not structure