Passive diffusion
A. Occurs only when the membrane is permeable to the solute.
B. requires the presence of a transmembrane protein.
C. is a spontaneous process.
D. requires energy.
E. is the process by which molecules move from an area of low concentration to an area of high concentration.
Answer: C
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Why do obligate symbionts often contain lower G+C content when compared to free-living organisms?
A) Ancestral symbionts had low GC content genomes by chance, and these low GC content genomes are passed onto their progeny. B) Free-living organisms must have a more stable genome to survive; low G+C content organisms are often selected against in nature. C) Replicating high G+C content genomes requires several additional enzymes, to break apart the strong triple bonds formed from GC pairs, which are rarely found in symbionts with relatively small genome sizes. D) Symbionts usually do not have as many DNA repair mechanisms as free-living organisms, and two common spontaneous mutations change GC pairs into AT pairs.
How does jasmonic acid contribute to the activation of the wound response in tomato plants?
A. It moves through the phloem of the plant until it reaches the wound site. B. It produces a polypeptide that binds with membrane lipids. C. It binds to enzymes in the gut of the predator. D. It increases the energy available for the plants to fight the predator. E. It signals gene expression, leading to the production of a proteinase inhibitor.
If someone has no genetic predisposition to cancer, then environmental exposure to carcinogens will not cause them to develop cancer.
Answer the following statement true (T) or false (F)
What is the name of the enzyme that fits new complementary DNA nucleotides into the new strand?
A. DNA telomerase B. DNA helicase C. DNA polymerase D. DNA ligase