Apes and humans together make up a group called
A. hominids.
B. hominoids.
C. Homo sapiens.
D. habilis.
E. prosimians.
B. hominoids.
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Cell cleavage during embryonic development in ducks is
A. meroblastic. B. holoblastic. C. complete. D. through the entire egg. E. impossible.
Which of these is an electron carrier molecule?
A. ATP B. Carbonic acid C. Adenylate kinase D. NAD+
Which of the following adds new nucleotides to a growing DNA chain?
a. DNA polymerase b. DNA helicase c. RNA primer d. primase e. RNA polymera
As you and a friend are entering a chemistry laboratory at your university, you see a sign that states: DANGER-RADIOACTIVE ISOTOPES IN USE. Your friend is an accounting major and has not had any science courses yet. She asks you what a radioactive isotope is and you respond correctly with
A. radioactive isotopes are atoms that are stable and as a result only emit energy if they are exposed to higher temperatures. B. radioactive isotopes are atoms that are unstable and as a result emit energy in a process called radioactive decay. C. radioactive isotopes are atoms that are stable and as a result emit energy in a process called radioactive decay. D. radioactive isotopes are atoms that are unstable but unless actively disturbed by some chemical process will remain intact and pose no problems.