Which of the following are purines?

A) adenine and guanine
B) adenine and thymine
C) guanine and uracil
D) guanine and cytosine


A) adenine and guanine

Biology & Microbiology

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____ have four pairs of walking legs attached to their cephalothorax and no antennae

a. Ticks and mites b. Insects c. Crustaceans d. Myriapods e. Arachnids

Biology & Microbiology

Release of what protein is directly subject to negative feedback inhibition when blood volume rises?

A. angiotensinogen B. aldosterone C. angiotensin II D. renin E. atrial natriuretic hormone

Biology & Microbiology

Genes are found in the same order for large stretches of the X chromosome in the rat and mouse genomes, indicating  

A.  occurence of aneuploidy. B.  formation of pseudogenes. C.  conservation of synteny. D.  conservation of neoteny. 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 synteny?   Consider Possibilities · Consider the different answer options. Which can you rule out?   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

Our ability to respond to moderate heat and cold is due to

A. mechanoreceptors. B. thermoreceptors. C. nociceptors. D. electromagnetic receptors. E. chemoreceptors.

Biology & Microbiology