Which of the following proposed the "sandwich" model of membranes, in which lipid bilayers are coated on both sides with thin sheets of proteins?
A) Overton
B) Langmuir
C) Gorter and Grendel
D) Davson and Danielli
E) Robertson
Answer: D
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Recall that glomeromycetes are fungi that can form symbiotic relationships (endomycorrhizae) with plants. Which of the following statements is also true of glomeromycetes? Select all correct choices
A. Glomeromycetes do not demonstrate any genetic diversity. B. Glomeromycetes can undergo a parasexual cycle. C. Genetic diversity in glomeromycetes is caused by mitotic recombination. D. Genetic diversity in glomeromycetes is caused by meiotic recombination. E. Glomeromycetes can undergo a sexual cycle.
If a mixture of bacteriophages, some labeled with radioactive sulfur and others labeled with radioactive phosphorus, is
placed in a bacterial culture, the bacteria will eventually contain ____.
a. primarily radioactive sulfur b. primarily radioactive phosphorus c. both radioactive sulfur and phosphorus d. neither radioactive sulfur nor radioactive phosphorus e. complete viruses with radioactive sulfur coats
Which of the following genera is an endospore former?
A) Escherichia B) Bacillus C) Staphylococcus D) Streptococcus E) Mycobacterium
Which of the following best describes fibrinogen?
A) Fibrinogen is a lipid found in platelets. B) Fibrinogen is the connective tissue in the wall of an artery. C) Fibrinogen is a transport lipoprotein that carries cholesterol. D) Fibrinogen is the protein portion of the hemoglobin molecule. E) Fibrinogen is a plasma protein involved in clotting.