Which structure is formed when histone H1 associates with linker DNA and the nucleosome?
a. euchromatin
b. the 10-nm chromatin fibre
c. heterochromatin
d. the solenoid
Answer: d. the solenoid
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Which substance will release hydrogen into a solution? a. None of these choices
b. Buffer c. Base d. All of these choices. e. Acid
Microbes called the group I archaea or mesophilic Crenarchaeota that were found to oxidize ammonia in marine environments are now placed in the phylum ________.
A. Crenarchaeota II B. Euryarchaeota C. Thaumarchaeota D. Korarchaeota
About __________ species of birds have been described
a. 1,000 b. 2,000 c. 4,500 d. 9,000 e. 20,000
All of the following statements regarding proteins are true EXCEPT
A) they are the primary components of muscle, connective tissue, nails, and hair. B) humans can synthesize all of the amino acids needed to make proteins. C) most enzymes are proteins. D) kwashiorkor is caused by protein deficiency. E) some act as receptors on cell membranes.