Which of the following is NOT true of hydrogen bonds?
a. They are quite weak.
b. The hydrogen is slightly positive.
c. They are uncommon in macromolecules.
d. They form in salts such as NaCl.
e. They always involve hydrogen.
C
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If tall (D) is dominant to dwarf (d), and two homozygous varieties DD and dd are crossed, then what kind of offspring
will be produced? a. all intermediate forms b. all tall
c. all dwarf d. 1/2 tall, 1/2 dwarf e. 3/4 tall, 1/4 dwarf
Which gas was the least abundant in the earth's atmosphere 3.5 billion years ago?
A. oxygen B. nitrogen C. carbon dioxide D. carbon monoxide
Fish that quickly and accurately sense the location of a nearby motionless fish in cloudy water are probably using
A) electromagnetic receptors. B) photoreceptors. C) chemoreceptors. D) pain receptors.
Why is bird flu (H5N1) considered an emerging disease whereas HIV is not?
A. Bird flu (H5N1) is bacterial whereas HIV is viral. B. Bird flu (H5N1) has only been recognized in the past 20 years. C. Bird flu (H5N1) has not infected as many people as HIV. D. Bird flu (H5N1) has infected more people than HIV. E. Bird flu (H5N1) is more deadly than HIV.