In humans, the 30S pre-RNA transcript yields three rRNA segments following transcription and RNA cleavage. What RNA transcripts are generated by the 30S pre-RNA transcript in E. coli?
A) two rRNAs (15S each)
B) three rRNAs (5S, 16S, and 23S)
C) two tRNA transcripts
D) three rRNAs (5.8S, 18S, and 28S) and two tRNA transcripts
E) three rRNAs (5S, 16S, and 23S) and two tRNA transcripts
E
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Which of the following structures is only found in animal cells when compared to plant cells?
a. cell walls b. chloroplasts c. mitochondria d. golgi apparatus e. centrioles
The effect of resource availability on
population size determines a. the carrying capacity of the environment. b. exponential growth. c. the doubling time of a population. d. the population's biotic potential. e. all of these.
Which of the following does NOT occur in the first trimester?
a. formation of a heart b. disappearance of the tail c. formation of internal organs d. detection of movement of the fetus e. segmentation and development of somites
Vampire squid (Vampyroteuthisinfernalis) are deep-sea cephalopods with features similar to both octopus and squid. Extensive video recordings show the diet of the vampire squid consists of items like crustacean remains and fecal pellets. Which of the following terms describes the position of the vampire squid in the deep-sea trophic pyramid?
A. Primary producer B. Secondary carnivore C. Detritivore D. Herbivore E. Primary carnivore