The basic building block of DNA and RNA is a(n) ____

a. nitrogenous base
b. sugar-phosphate backbone
c. amino acid
d. nucleotide

e. ribose sugar


d

Biology & Microbiology

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The chromosome that plays the largest role in human sex determination is

A. the group of autosomes known as the SRY group. B. the Y chromosome. C. chromosome number 21. D. the X chromosome. E. chromosome number 22.

Biology & Microbiology

Which of the following is a characteristic of sea stars?

a. two stomachs b. thin arms c. suspension feeders d. a notochord

Biology & Microbiology

You are working to identify enhancer regions of a particular gene. The best place to look is  

A.  immediately upstream of the promoter. B.  immediately downstream of the promoter. C.  primarily upstream of the promoter, possibly some distance away. D.  primarily downstream of the promoter, including the exons of the coding region. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about enhancers? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect 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?

Biology & Microbiology

Which scientist is credited with coining the term cell from the Latin cellulae?

A) Robert Brown B) Antonie van Leeuwenhoek C) Theodor Schwann D) Matthias Schleiden E) Robert Hooke

Biology & Microbiology