The virus that causes rabies travels up nerve cells to the brain and spinal cord. Which cell structures will allow the virus to move through the nerve cells?
A) pseudopods B) Golgi complexes C) nuclei D) microtubules
Answer: D
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After the drought of 1977, researchers hypothesized that on the Galàpagos island Daphne Major, medium ground finches with large, deep beaks survived better than those with smaller beaks because they could more easily crack and eat the tough Tribulus. After the drought of 1977, researchers hypothesized that on the Galápagos island Daphne Major, medium ground finches with large, deep beaks survived better than those with smaller beaks because they could more easily crack and eat the tough Tribulus cistoides fruits. A tourist company sets up reliable feeding stations with a variety of bird seeds (different types and sizes) so that tourists can get a better look at the finches. Which of these events is now most likely to occur to finch beaks on this island?
A) evolution of yet larger, deeper beaks over time, until all birds have relatively large, deep beaks B) evolution of smaller, pointier beaks over time, until all birds have relatively small, pointy beaks C) increased variation in beak size and shape over time D) no change in beak size and shape over time
What is required for formation of the transcription initiation complex in eukaryotes?
A. binding of a transcription factor to the TATA box, followed by recruitment of additional transcription factors and recruitment of RNA polymerase II B. binding of a transcription factor to the transcription bubble, followed by recruitment of additional transcription factors and recruitment of RNA polymerase III C. binding of the sigma subunit to the start site followed by recruitment of RNA polymerase II D. binding of RNA polymerase II to the TATA box, followed by recruitment of transcription factors E. binding of the sigma subunit to promoter elements at -35 and -10, followed by recruitment of the core polymerase
The number of European rabbits in Australia is
currently controlled by a. two viruses. b. a 2,000-mile-long fence. c. pesticide application to grasslands. d. toxic species of grasses. e. fumigation and destruction of their burrows.
The cellular effect of the abnormally oligomerized yeast protein Sup35 is
a. failure of translation to terminate. b. abnormal chromosome inactivation by heterochromatin formation. c. abnormal imprinting of some genes. d. abnormal cytoskeletal structures. e. failure of chromosomes to condense during mitosis.