Chromosomal gene exchange is not useful in classification studies because prokaryotes do not reproduce sexually.
Answer the following statement true (T) or false (F)
False
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Adenoviruses are a frequent cause of acute upper respiratory tract infections in humans. Adenoviruses are non-enveloped and their capsid contains a "fiber" protein that is analogous in function to the spike glycoproteins of HIV. Which of the following would be ACCURATE about an adenovirus that has a mutation in its fiber protein gene?
A. The virus would still cause upper respiratory tract infections in humans but at a slower rate. B. Because it has a defective fiber protein, it will now have a broader host range. C. It would not be able to cause disease in humans. D. It would be able to infect humans normally, but would not be able to replicate its genome. E. It would be able to infect humans normally, but would not be able to release new adenoviruses from the human cells.
The enzyme _______ has a pH optimum most similar to peak A in the above graph.
A. lipase B. pepsin C. pancreatic amylase D. trypsin E. salivary amylase F. chymotrypsin Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about optimal pH for an enzyme? 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? 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?
Modern humans evolved about
a. 200,000 years ago. b. 2,000,000 years ago. c. 2,000,000,000 years ago. d. 4,600,000,000 years ago.
Endoplasmic reticulum (ER) with many ribosomes attached is called ________ ER, whereas endoplasmic reticulum that is mostly devoid of ribosomes is called ________ ER.
What will be an ideal response?