Which of the following is true about the relationship between plectonemic and solenoidal supercoils?
A. Plectonemic supercoils are stabilized by proteins, whereas solenoidal supercoils are not.
B. The formation of plectonemic versus solenoidal supercoils is sequence specific.
C. Plectonemic supercoils are always left-handed and solenoidal supercoils are always right-handed.
D. In underwound DNA, plectonemic supercoils are all right-handed and solenoidal supercoils are all left-handed.
E. Plectonemic supercoils compact the DNA to a greater extent than solenoidal supercoils.
D
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Why is there a problem replicating the ends of linear DNA?
A. Leading strand synthesis primed at the replication origin of a linear DNA can't remove and replace the primer. B. Lagging strand synthesis primed at the ends of a linear DNA can't be removed and replaced because there is no 3'-OH available. C. Since replication only initiates at the ends of linear DNA, the priming of each leading strand leaves a primer at the end that cannot be removed. D. Okazaki fragments are generated along both strands but DNA ligase is inhibited by the Tus-Ter complexes at the ends of the DNA. E. Primase cannot copy telomere DNA.
Which statement is TRUE?
a. Environment can readily alter some genotypes. b. Genotype is manifested in phenotype. c. Unlike phenotypic variation, genetic variation is easily observable. d. Variation dies with individuals. e. Phenotype is seen physically in the genotype.
In what type of mating system is marked sexual dimorphism unlikely?
A. monogamy B. polyandry C. polygamy D. polygyny E. polygamy and polyandry
Fast muscle fibers contain a high proportion of myofibrils, which allows the fibers to generate high amounts of force. However, this leaves little room in the fibers for other cellular components, including mitochondria. The opposite is true for slow
muscle fibers. Does this information support or refute what you know about the fatigue-susceptibility of fast and slow fibers? Why or why not? A) It supports it because if fast fibers have less room for mitochondria than slow fibers do, they cannot produce as much ATP and thus are less fatigue-resistant than slow fibers. B) It supports it because if fast fibers have less room for mitochondria than slow fibers do, they can produce more ATP than slow fibers and thus are more fatigue-resistant than slow fibers. C) It refutes it because if fast fibers have less room for mitochondria than slow fibers do, they can produce more ATP than slow fibers and thus are less fatigue-resistant than slow fibers. D) It refutes it because if fast fibers have less room for mitochondria than slow fibers do, they cannot produce as much ATP and thus are more fatigue-resistant than slow fibers.