A coccus is a(n) ____
a. rod-shaped bacterium
b. spherical bacterium
c. multicellular bacterial colony
d. spiral-shaped bacterium
e. bacteriophage
ANSWER: b
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Turner Syndrome (XO) is the only viable monosomy found in humans. Some sex chromosome
trisomies are also viable, including XXX, XXY, and XYY. There are no viable autosomal monosomies, and a small handful of viable autosomal trisomies exist, such as Trisomy 21 (Down Syndrome), and Trisomy 13 and 18, both of which are lethal within the first year of life. Clearly aneuploidy is not tolerated well in humans. Speculate as to why there are so few viable monosomies (only one) in humans, and then why there are so few viable trisomies. Also, speculate as to why aneuploidy involving the sex chromosomes is better tolerated than those involving autosomes.
What will be an ideal response?In which of these locations are salivary gland found?
A) side of the face below and in front of the ears B) the floor of the oral cavity C) roof of the oral cavity D) under the tongue.
What is the definition of the eclipse phase?
A) When the virus is developing but not yet infectious B) When a virus matures and is capable of infecting a new host C) When the active, infectious viral particle escapes from the host D) When the viral DNA becomes latent as a prophage E) When the virion enters the host cell
Which of the following is true of a viral DNA genome?
A. Viruses use only RNA for their genome. B. It is usually composed of unusual bases unique to viruses. C. It uses the same four nitrogenous bases found in prokaryotic and eukaryotic DNA. D. It may have the normal bases found in prokaryotic and eukaryotic DNA, or it may have one or more unusual bases.