If a virus is referred to as naked, it means it lacks which structure?
a. Protein coat
b. Capsid
c. Envelope
d. Nucleocapsid
C
Viruses that do not have an envelope are often referred to as naked. Naked viruses are resistant to environmental factors. As a result of their stability, they are typically transmitted via the fec-al-oral route.
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What feature of the double-stranded DNA helix suggested to Watson and Crick a mechanism by which DNA could be replicated?
What will be an ideal response?
Roberts Syndrome extremely rare genetic disorder that is characterized by mild to severe prenatal retardation or disruption of cell division, leading to malformation of the bones in the skull, face, arms, and legs. Shown below is a pedigree for a family with Robert’s Syndrome. Consider couple II-C and II-D. What is the probability that their next two children will have Robert's Syndrome?
A. 1/4
B. 1/2
C. 1/8
D. 1/16
E. 1/32
What mechanism is used by a bacterial cell to fit its DNA into the nucleoid region?
A. the formation of loop domains B. supercoiling by topoisomerases C. tight wrapping around histones to form nucleosomes D. the formation of loop domains and supercoiling by topoisomerases E. the formation of loop domains, supercoiling by topoisomerases, and tight wrapping around histones to form nucleosomes
In an emergency room, a patient is found to have a depressed breathing rate, and subsequently low oxygen levels in the tissues. He is put on oxygen, but his respiration rate continues to be too low, and his oxygen saturation level in his tissues also continues to be too low. Will increasing the oxygen levels that he is receiving correct his low breathing rate?
A. Yes, because normal oxygen levels in the tissues will cause his breathing rate to return to normal. B. Yes, because the increased oxygen levels in the lungs will stimulate the breathing rate to return to normal. C. No, because the oxygen will be immediately used up to the previous deficit. D. No, because the brain does not use oxygen levels to regulate breathing.