To meet the high oxygen demands of flight, birds _____
a. use simple lungs
b. use air sacs connected to their lungs
c. use carbon dioxide for respiration
d. can diffuse oxygen through their skin
e. use simple lungs, and can diffuse oxygen through their skin
ANSWER: b
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Stem cells ____
a. have the property of self-renewal by division b. are the least likely to give rise to cancer c. do not have the ability to divide d. are immature cells that become nerve tissue susceptible to cancer e. are found only in cancerous tumors
The dashed line in the accompanying figure represents a(n) ____
a. covalent bond b. ionic bond c. hydrogen bond d. polar covalent bond e. hydrophobic interaction
The proteins that enable the HIV virus to bind to cells are typically CD4 and CCR5. On what type of cells are these proteins typically observed?
A) plasma cells B) dendritic cells C) effector helper T cells D) memory helper T cells E) both C and D
The ribosomes in eukaryotic cells are larger than the ribosomes in prokaryotic cells
Furthermore, eukaryotic ribosomes are not affected by some chemicals that affect prokaryotic ribosomes, a fact that can be put to good use by microbiologists seeking new antimicrobial drugs. An example of this is the antibiotic erythromycin, which prevents protein synthesis by prokaryotic ribosomes but does not affect eukaryotic ribosomes at all. Thus, erythromycin kills bacteria but does not affect humans or other animals. Using this information, which of the following would be expected and would support the endosymbiont hypothesis? A) Mitochondrial ribosomes will be larger than prokaryotic ribosomes. B) The ribosomes in chloroplasts will be sensitive to erythromycin. C) Mitochondria and chloroplasts will not have ribosomes. D) Mitochondrial ribosomes will be smaller than prokaryotic ribosomes.