Compare and contrast DNA and RNA. Include the similarities and differences of their chemical
structures, as well as their roles within the cell, in your comparison. What will be an ideal response?
DNA and RNA are both polynucleotides. DNA is double-stranded, contains deoxyribose, and
contains thymine instead of uracil. RNA is shorter, usually single-stranded, contains ribose, and
contains uracil instead thymine. The sequence of bases in DNA determines the sequence of amino
acids in a protein, and various types of RNA function as intermediaries between DNA and protein
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Garstang's theory states that the vertebrates originated from:
A. larval tunicates that developed the ability to reproduce sexually while retaining the larval body form B. a gradual modification of the adult body form of Urochordates C. larval Cephalochordates that developed the ability to reproduce sexually while retaining the larval body form D. echinoderms with a post anal tail and notochord E. segmented echinoderms
The neuron that secretes neurotransmitters into the synapse is called the _________, and the neuron that receives the signal is called the ________.
A. presynaptic neuron; postsynaptic neuron B. preneurotransmitter; postneurotransmitter C. postneurotransmitter; preneurotransmitter D. postsynaptic neuron; presynaptic neuron
Communities with a high level of bacterial diversity are found in many habitats including soil and aquatic environments. Recent studies indicate this diversity is crucial to the functioning of these communities. The same studies have also found that phage abundance plays a critical role in the maintenance of the bacterial diversity within these communities. What is the probable role of phages in this community? (Check all that apply)
_____ they act as facilitators _____ they have a mutualistic relationship with the bacteria _____ they parasitize the bacteria _____ they have a commensal relationship with the bacteria _____ they compete with the bacteria for space and nutrients _____ they keep any one species of bacteria from becoming too abundant in the community Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about maintaining bacterial diversity in a community? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection on Process: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
A light microscope with an objective lens numerical aperture of 0.65 is capable of allowing two objects 400 nm apart to be distinguished when using light with a wavelength of 420 nm.
Answer the following statement true (T) or false (F)