The grinding apparatus of the digestive system of the crayfish is/are the
a. oral teeth.
b. gizzard.
c. pharyngeal jaw.
d. gastric mill.
c
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While analyzing data from the prior week, a chemist determines that she has discovered a new type of atom. While the atom has the same number of protons as nitrogen, the number of neutrons is different. What has she discovered?
a. an isomer b. an ion c. an isotope d. a compound
Why is cancer described as a disease of altered gene expression?
a. Gene expression controls lipid raft formation. When lipid rafts fail, cell to cell communication can break down, resulting in cancer. b. Mutated genes can trigger demyelination of the nerve cells, causing breakdown of nerve signal transmission and resulting in tumor formation. c. Mutated genes can result in proteins that behave erratically or fail to function. If they function in cell cycle control, the result can be out of control, cancerous growth. d. This statement is mostly untrue as gene expression has very little control over the development of cancer.
The region of a prokaryotic cell where the bacterial chromosome (DNA) is located in the
A. cell membrane. B. nucleus. C. cell wall. D. nucleoid. E. ribosome.
The polypeptide-making organelles, which consist of protein combined with RNA, are called
A. centrosomes. B. Golgi bodies. C. mitochondria. D. ribosomes. E. lysosomes.