Nitrogen Fixation is:
A) A process that allows visualization of cells with a microscope
B) possible in all living cells
C) conversion of nitrogen-containing organic molecules into nitrogen gas
D) production of ammonia and other compounds from nitrogen gas
E) storage of nitrogen gas within a cell vacuole
Ans: D) production of ammonia and other compounds from nitrogen gas
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a. acoustical b. visual c. chemical d. electrical e. tactile
The phospholipids of plasma membranes have
a. a hydrophobic head and a hydrophilic tail. b. a hydrophobic head and a hydrophobic tail. c. a hydrophobic head and two hydrophobic tails. d. a hydrophilic head and two hydrophobic tails. e. a hydrophilic head and two hydrophilic tails.
Gene targeting has been used in mice to produce strains that were either homozygous or heterozygous for ____
a. PKU b. cystic fibrosis c. Huntington's disease d. sickle cell anemia e. Tays Sachs Disease
Jorge has developed prostate cancer, so he undergoes an operation to remove the malignancy. What other structures will the cancer specialists look at to check for metastasis?
A) connecting veins B) local arteries C) portions of the liver D) neighboring lymph nodes