Some bird bones are hollow rather than honeycombed. The hollow bones mostly contain air sacs. The replacement of bone marrow with air sacs is properly understood as an adaptation that _____
1) reduces the weight of the bird
2) facilitates flight
3) eliminates the functions of bone marrow
A) only 1
B) only 2
C) only 3
D) 1, 2, and 3
E) 1 and 2
Answer: E
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Two proteins associated with a rare neurodegenerative disorder have been sequenced. Protein A contains many polar amino acids with small regions containing nonpolar, hydrophobic amino acids
Protein B is rich in nonpolar, hydrophobic amino acids with only two small regions containing polar amino acids. What might this suggest about the two proteins? A) The two proteins may have different secondary structures. B) Protein A is fibrous and Protein B is globular. C) Protein A may be a cytoplasmic protein and Protein B may be a membrane associate protein. D) Protein A and Protein B are complementary parts of a supramolecular structure. E) Protein A is most likely and enzyme and Protein B is most likely a storage protein.
The gene that codes for the connective tissue protein fibrillin is the gene that causes
____________________.
The members of each homologous pair of chromosomes separate during meiosis I
__________________ Indicate whether the statement is true or false.
Which of the following best describes why ice was used during this experiment?
a. To increase the activity of the enzyme b. To retard the breakdown of the catalase c. To purge the solution of excess air trapped during blending d. To slow the catalase molecules to increase the probability of contact with the hydrogen peroxide molecules e. To increase the size of the active site on the enzyme