Typically, nitrogen atoms are composed of electrons, protons, and neutrons. An isotope of nitrogen could
A) be positively charged.
B) be negatively charged.
C) have more protons than the usual nitrogen atom.
D) have more neutrons than the usual nitrogen atom.
Answer: D
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Nondisjunction
(a) results in gametes with abnormal chromosome numbers. (b) occurs at anaphase. (c) results when homologues fail to separate properly in meiosis. (d) is all of the above.
A distinguishing characteristic of actinomycetes that can be used to classify these organisms is the types of sugars found in extracts of the organisms.
Answer the following statement true (T) or false (F)
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 unstable and as a result emit energy in a process called radioactive decay. B. Radioactive isotopes are atoms that are stable and as a result only emit energy if they are exposed to higher temperatures. 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.
Which results from stimulation by the parasympathetic nervous system?
A) increased heart rate B) inhibition of the digestive organs C) inhibition of urination D) stimulation of saliva secretion