Which of the following groups of microorganisms produces antibiotics?
A. Penicillium
B. Streptomyces
C. Bacillus
D. Penicillium AND Streptomyces
E. All of the choices are correct.
E
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All of the following proteins may be found in the extracellular matrix of animal cells EXCEPT _____
A) collagen B) fibronectin C) actin D) All of the listed proteins are found in the extracellular matrix of animal cells.
Molecules that are required for the Calvin cycle include: Check all that apply.
_____ H2O. _____ CO2. _____ NADPH. _____ rubisco. _____ ATP.
In what way do the various membranes of a cell differ?
a. Phospholipids are found only in certain membranes. b. Certain proteins are unique to each membrane. c. Only certain membranes are constructed from molecules with dual solubility. d. Only certain membranes of a cell are selectively permeable. e. Some membranes have hydrophobic surfaces exposed to the cytoplasm, while others have hydrophilic surfaces facing the cytoplasm.
The mitochondria present in the sperm provide
a. energy for the movement of the flagellum. b. energy for the acrosome to penetrate the egg. c. energy for the maturation of the sperm. d. nutrients for the sperm. e. nutrients for the developing embryo.