Which statement about cell adhesion molecules (CAMs) is false?
A) They are glycoproteins.
B) They bind to CAMs on other cells.
C) They are all produced by the same gene.
D) They contribute to cell migration.
E) They contribute to stable tissue structure.
Answer: C) They are all produced by the same gene.
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DNA associates very tightly with nucleosomes because
A. DNA can form covalent bonds with histone proteins. B. negative charges on DNA are attracted to positive charges of the histone proteins. C. the histone tails wrap tightly around the DNA double helix. D. the amino acids of histone proteins are largely acidic, while DNA molecules are basic. E. histone H1 tightens the coils of DNA that are wrapped around the nucleosome.
An animal cell contains ___________ genome(s), while a plant cell contains ___________ genome(s).
A. 1,1 B. 2,2 C. 2,3 D. 3,2 E. 1,2
In both spermatogenesis and oogenesis, one sperm/egg forms from one primary spermatocyte/oocyte.
Answer the following statement true (T) or false (F)
People who have phenylketonuria, a genetic disorder, are unable to break down the amino acid phenylalanine so that it can be used in cellular respiration. Yet they need phenylalanine in their diet. Why do they need to eat some foods with phenylalanine?
A) Amino acids yield the most energy per gram, so they need phenylalanine to supply their cells with energy. B) Amino acids are used to build proteins and so they need enough phenylalanine for biosynthesis without any leftover that needs to be broken down to enter cellular respiration. C) Cellular respiration can use proteins more readily than other types of molecules, so the amino acid phenylalanine is essential.