Which of the following carries amino acids to ribosomes?
a. mRNA
b. tRNA
c. hnRNA
d. rRNA
e. all of these
ANSWER: b
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What field of study uses geographic distribution of extinct and living species to determine patterns of evolution?
A. Biology. B. Geology. C. Palentology. D. Geneology. E. Biogeography.
Which of the following cerebral areas is correctly matched with its function?
a. occipital lobes-control auditory centers b. temporal lobes-control skeletal muscles c. frontal lobes-directly receive visual input d. parietal lobes-receive sensations of heat, touch, pressure e. substantia nigra-control learning and language
The most famous and well-studied mass extinction occurred at the end of the Cretaceous period (65 million years ago), at which time the dinosaurs and a variety of other terrestrial and aquatic organisms went extinct. Recent findings have supported the hypothesis that this extinction event was triggered when a large asteroid slammed into Earth. Which of the following could cause a global mass extinction following an asteroid strike? (Check all that apply.)A) The impact triggered global forest fires that obscured the sun.B) The asteroid killed animals it hit upon impact.C) The asteroid was very hot when it entered the atmosphere and heated up the planet.D) The asteroid created a massive dust cloud that obscured the sun.
What will be an ideal response?
At which stage of mitosis are chromosomes usually photographed in the preparation of a karyotype?
A) prophase B) metaphase C) anaphase D) interphase