Study of the origin of life has resulted in the breakdown of cellular development into overlapping stages, beginning with the synthesis of precursor molecules for the synthesis of nucleotides and amino acids and ending in polymers enclosed in membranes acquiring cellular properties. Which of these stages were a focus of study for Miller and Urey in their FIRST experiment?
A. Stage 1: Nucleotides and amino acids were produced prior to the existence of cells.
B. Stage 2: Nucleotides became polymerized to form RNA and/or DNA, and amino acids became polymerized to form proteins.
C. Stage 3: Polymers became enclosed in membranes.
D. Stage 4: Polymers enclosed in membranes acquired cellular properties.
E. Stage 5: Ribosomes were developed inside the membrane.
A. Stage 1: Nucleotides and amino acids were produced prior to the existence of cells.
You might also like to view...
Choose the item in column 2 that best matches each item in column 1.
A) breaking and capping actin B) increase cellular surface area C) assembly and disassembly D) terminal web E) control microtubule organization F) plectin G) central shaft H) nucleating actin branches I) bind to profilin and CapZ J) oligomer formation K) nucleating tubulin branches L) hemidesmosome M) decorate the actin microfilament N) dynein O) prevents loss of subunits P) desmosome Q) nuclear lamina R) account for 10-15% of microtubules S) inhibits microtubule assembly T) two identical polypeptides joined end-to-end U) found in cilia and flagella 1) axonemal microtubules 2) nucleation 3) treadmilling 4) nocodazole 5) motor MAPs 6) Arp2/3 complex 7) myosin subfragment 1 (S1) 8) capping protein 9) gelsolin 10) microvilli 11) filamin 12) polyphosphoinositides 13) nonmotor MAPs 14) axoneme 15) microtubule-associated proteins (MAPs)
The effect of population growth limiting factors begin to become evident at about the letter ____
a. A b. B c. C d. D e. E
Which of the following statements is supported by the evidence from the tree
A. All the anole species in this tree do not share a common ancestor. B. Anolis coelestinusis more closely related to Leiocephalus carinatusthan to any other anole species. C. Anolis coelestinusis the oldest anole species. D. The anole species on Puerto Rico and Hispaniola evolved from a common ancestor.
A vegetative cell becomes a sporangium with a developing prospore. How many endospores are formed from each vegetative cell?
A) One endospore B) Two endospores C) Four endospores D) Eight endospores