The B form of the DNA double helix contains a wider major groove and a narrower minor groove because the two polynucleotide strands are not positioned directly opposite one another in the helical cylinder.
Answer the following statement true (T) or false (F)
True
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The normal functions of Spo11 and Cas9 enzymes are different because
A) Spo11 produces double-strand breaks during meiosis, whereas Cas9 functions during mitosis. B) Spo11 produces site-specific double-strand breaks during meiosis, whereas Cas9 breaks DNA at random genomic locations. C) Spo11 produces double-strand breaks in many genomic locations during meiosis, whereas Cas9 is targeted to specific sequences by a CRISPR RNA. D) Spo11 produces double-strand breaks at sequences targeted by RNAs expressed during meiosis, whereas Cas9 has the ability to recognize DNA sequences without an RNA. E) Spo11 is unique to yeast, whereas Cas9 occurs in most higher eukaryotes.
Given the structure below, please answer the following questions
Is the accompanying figure DNA or RNA? ________ Is the arrow closest to the 5' or 3' end? ________ Spleen diesterase is an enzyme that breaks the covalent bond that connects the phosphate to the 5' carbon. Assume that the dinucleotide is digested with spleen diesterase. To which base and to which carbon on the sugar is the phosphate now attached, A or T? A) DNA; 3' end; T, 5' B) DNA; 5' end; A, 5' C) RNA; 3' end; A, 3' D) RNA; 3' end; T, 3' E) DNA; 3' end; A, 3'
Which of the following statements about asexual organisms is true?
A. Asexual organisms can bring together two beneficial mutations that arise in different individuals B. Asexual organisms can unlink deleterious mutations from beneficial ones C. Populations of asexual organisms suffer when the most fit individuals fail to reproduce, causing the population's mean fitness to fall
Turbellarian flatworms have a distinct head. When compared to the head of an insect, what is the flatworm head missing?
A. A mouth B. light-sensitive structures C. Sensory organs D. Anterior collection of nerve cells