Major classes of macromolecules present in all living microorganisms include
A) amino acids, carbohydrates, lipids, and nucleic acids.
B) cell wall, cytoplasmic membrane, nucleoid, and ribosomes.
C) genes, proteins, and vitamins.
D) inorganic and organic compounds.
Answer: A
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Sperm are produced in the ____ tubules of the testes
Fill in the blank with the appropriate word.
Animal cells are permeable to water and urea but NOT to sucrose. Initially, the inside of a cell contains 1 M sucrose and 1 M urea and the outside 1 M sucrose and 2 M urea. After the system reaches equilibrium, what changes are observed?
A. The molarity of urea would be higher outside than inside the cell. B. The molarity of sucrose would be similar inside and outside the cell. C. Water would move out of the cell causing the cell to shrivel. D. The molarity of urea would be higher outside the cell and the molarity of sucrose would be similar inside and outside the cell. E. The molarity of sucrose would be similar inside and outside the cell and water would move out of the cell causing the cell to shrivel.
Competent cells
A. are able to take up naked DNA. B. are antibiotic resistant. C. occur naturally. D. can be created in the laboratory. E. are able to take up naked DNA, occur naturally, AND can be created in the laboratory.
The accompanying figure shows that the rate of alarm calls made by black-tailed prairie dogs is dependent on a perceived threat by a predator. This behavior affects ________
A) the direct fitness of the caller B) the indirect fitness of the caller C) both the direct and indirect fitness of the caller D) neither the direct nor indirect fitness of the caller