Myxobacteria lyse bacteria and yeasts by secretion of digestive enzymes. They then use the resulting peptides and amino acids as a source of which of the following?
A. Phosphate
B. Iron
C. Nitrogen
D. All of the choices are correct.
Answer: C
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In cell signal propagation, what does dimerization do?
a. moves water across the plasma membrane in large quantities b. allows activated receptors to interact extracellularly with the surrounding environment c. enables the intracellular domains of the receptors to activate each other d. shuts down the signaling pathway
New genetic variations sometimes become more common within populations because ____
a. most parts of the genome are non-coding and are available for selection b. proteins can be "recruited" for advantageous function c. proteins for which they code are advantageous and selected d. adaptation occurs rapidly in the few species that have survived through time e. mutations are able to select against genetic variations that had disadvantageous function
Active transport is different from simple diffusion in that active transport
A. requires energy. B. All of the answer choices are correct. C. moves molecules against a concentration gradient. D. requires transport proteins embedded within the cell membrane. E. moves molecules from an area of lower concentration to an area of higher concentration.
Haldane pointed out that if he received a certain allele, the chance that one of his brothers would receive that allele would be
A. 100%. B. 50%. C. 10%. D. random. E. 0%.