Knockout experiments involving __________ genes in fruit flies (Drosophila melanogaster) revealed local controls over gene expression.
Fill in the blank(s) with the appropriate word(s).
homeotic
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DNA is wrapped around histones, which contain many copies of the positive amino acids lysine and arginine. These positive amino acids neutralize the negative charge of the ______________ of the DNA wrapped around the histone
A. ribose sugar B. hydroxyl group C. nitrogenous base D. phosphate group E. All of the answer options are correct.
Bacterial decomposition of organic nitrogen results in the production of:
a. ammonia. b. nitrates. c. nitrites. d. atmospheric nitrogen. e. urea.
Which of the following processes involves behaviors that are acquired by learning and can be modified and passed on from one generation to the next?
A) Prebiotic evolution B) Cultural evolution C) Natural selection D) Pre-adaptation E) Environmental selection
Which of the following proteins are part of the first line of defense against microbial invasion?
A) dermacidins B) TLRs C) NOD proteins D) C3 and C5 E) interferons