Viruses, bacteria, and old organelles that a cell wants to get rid of are broken down in ________.
a) ribosomes
b) mitochondria
c) rough ER
d) lysosomes
Ans: d) lysosomes
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Refer to the figure above. Which curve best describes survivorship in humans who live in developed nations?
A) A B) B C) C D) D E) E
The RNA molecules of an RNA world on early Earth may have been composed of bases other than A, U, G, and C
because ____.
a. DNA does not use all four bases b. these nucleotides will not form a double helix c. these nucleotides cannot be created in a Miller-Urey like experiment d. G is somewhat unstable in water e. C is somewhat unstable in water
Which statement about prokaryotic gene expression is true?
a. RNA transcription and protein translation occur almost simultaneously. b. Gene expression is regulated primarily at the epigenetic level. c. Prokaryotic organisms have intracellular organelles. d. RNA post-processing includes the splicing of exons.
Which meal is high in fiber, low in saturated fats, and high in unsaturated fats?
A) beef, potatoes, and carrots B) eggs and bacon C) black beans, cheese, lettuce, and sour cream D) spaghetti noodles with olive oil and broccoli