What is a noncoding, repetitive DNA sequence at the end of chromosomes?
a. telomere
b. guanine cap
c. transposons
d. telomerase
e. tandem repeats
a
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Which organism would likely harbor the MOST two-component regulatory systems?
A) an archaeon living in an extreme environment B) a bacterium occupying a heterogeneous niche will high nutrient mixing C) an organism capable of quorum sensing D) a parasitic bacterium living inside another organism
Which signal do helper T cells respond to in the MHC II molecule?
a. missing self b. normal self c. non-self d. altered self
Which hormone stimulates spermatogenesis?
a. LH b. FSH c. testosterone d. progesterone
Protein phosphorylation is commonly involved with all of the following EXCEPT _____
A) regulation of transcription by extracellular signaling molecules B) enzyme activation C) activation of G protein-coupled receptors D) activation of protein kinase molecules