What do the cell walls of plants and the extracellular matrix of animal cells have in common?
A) They are largely composed of phospholipids and glycoproteins.
B) Their proteins are made by free cytoplasmic ribosomes.
C) They form rigid structures that provide structural support for cells but limit their expansion.
D) They limit the passage of small molecules.
E) They have functional connections with the cytoskeleton inside the cell.
Answer: E
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Match the following items with the correct phrases.
_______1. The end product of ____________________ is a messenger RNA molecule. _______2. Combining two monosaccharides to form a disaccharide is an example of ____________________. _______3. James Watson and Francis Crick were the first to publish an article describing ____________________. _______4. The end product of ____________________ is a protein. _______5. Breaking the bond in a disaccharide to produce two monosaccharides is an example of ____________________. a. a dehydration synthesis reaction b. DNA replication c. a hydrolysis reaction d. transcription e. translation
The early Earth reducing atmosphere is thought to have lacked which of the following gases?
A. N2. B. O2. C. CO2. D. H2O. E. SO4.
A contractile vacuole is important to euglenoids for:
a. photosynthesis b. food storage c. excess water removal d. movement e. structure
The yield from each pyruvate in the second
stage of aerobic respiration includes a. 4 NADH. b. 1 FADH2. c. 1 ATP. d. 3 CO2. e. all of these.