Only bacteria cells have cell wall
a. true
b. false
Ans: b. false
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Genetic testing has revealed that mating between Homo sapiens and Homo neanderthalenis likely took place in ____
a. France b. China c. Papua New Guinea d. England e. the Middle East
To get into the nucleus a component has to have the correct signal sequence and pass through a nuclear pore.
a. true b. false
Which of the following post-transcriptional modifications allow multiple forms of protein products from the same gene sequence?
A. phosphorylation B. methylation C. alternative splicing D. poly-A tail E. 5’ nucleotide cap
Which of the following statements is false?
(a) Nucleotides and amino acids can act as extracellular signal molecules. (b) Some signal molecules can bind directly to intracellular proteins that bind DNA and regulate gene transcription. (c) Some signal molecules are transmembrane proteins. (d) Dissolved gases such as nitric oxide (NO) can act as signal molecules, but because they cannot interact with proteins they must act by affecting membrane lipids.