What do polysaccharides, such as cellulose; nucleic acids, such as DNA; and proteins, such as keratin, have in common?
A) They are all amino acids.
B) They are all nonpolar.
C) They are all built of chemically linked monomers.
D) They are all lipids.
E) They are all carbohydrates.
Answer: C
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What do scientists attribute to the remarkable survival abilities of the tardigrades?
a. like a virus, they are not truly alive b. the ability to mutate their DNA intentionally c. unique protective proteins that replace the water in their cells d. they are alien life visiting this planet
You have a tube of nutrient broth, in which E. coli is growing. Upon analyzing the broth chemistry, you find:oxygen content has dropped a bit, but carbon dioxide has gone up a lot formic, acetic, and lactic acids are present What kind of metabolism has most likely occurred?
A. Anaerobic respiration B. Aerobic respiration C. Photosynthesis D. Fermentation
Axons branch into axon terminals, which have ________ located at the terminal ends
A) Schwann cells B) dendrites C) nodes of Ranvier D) bulbs E) hillocks
Each of the following structures is found within the nucleus of a eukaryotic cell except
A) transfer RNA. B) histones. C) plasmids. D) the nucleolus. E) All of these are found in the nucleus.