An organism in the domain Eukarya is characterized by all of the following EXCEPT
A) ingestion of organic matter to acquire nutrients.
B) the ability to maintain precise internal conditions.
C) being composed of prokaryotic cells.
D) the potential to grow and reproduce.
C
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If photosynthetic eukaryotic cells are provided with CO2 synthesized with heavy oxygen (18O), the 18O
label may be found in all but one compound. That compound is
a. 3-phosphoglycerate. b. cellulose. c. glucose. d. O2 gas. e. RuBP (Ribulose bisphosphate).
Why would hydrophilic substances such as sodium ions (Na+), hydrogen ions (H+), sugars, and amino acids be unable to simply diffuse across a plasma membrane?
a. They readily mix with the hydrophobic tails forming the core of the phospholipid bilayer. b. They are repelled by the hydrophilic heads of the phospholipids that form the phospholipid bilayer. c. They do not readily mix with the hydrophobic tails forming the core of the phospholipid bilayer; therefore, they must move across by facilitated diffusion. d. They do not readily mix with the hydrophobic tails forming the core of the phospholipid bilayer; therefore, the only way they can move into the cell is by endocytosis.
Typical pneumonia is caused by which bacterium?
a) Haemophilus influenzae b) Streptococcus pneumoniae c) Mycoplasma pneumoniae d) Legionella pneumophila
Vaccination triggers an immune response which produces ________ immunity
A) artificial passive B) natural passive C) natural active D) artificial active E) both active and passive