Which cell structure does Neisseriae gonorrhoeae use to attach and enter tissue?
a. cell wall components
b. capsules
c. flagella
d. fimbriae
Ans: d. fimbriae
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The enzyme required to attach the sticky ends of DNA and used when splicing DNA fragments into other DNA is ________.
A. helicase B. ligase C. endonuclease D. reverse transcriptase
Most antihelminthic medications act only against the pathogens, not the human host.
Answer the following statement true (T) or false (F)
Scientists are always thinking about ways to improve experimental design. In the text's potato chip experiment, which
of these changes would produce the most effective design?
a. Show a different movie. b. Exclude teenagers as group members. c. Collect uneaten chip remains and weigh them for both groups. d. Provide free drinks before the experiment. e. Use a smaller theater.
An unfortunate deer becomes stuck in quicksand at the edge of a lake and dies. A few months later, it is buried by sediment in a massive landslide, but by this time, bacteria have fully decomposed its soft tissues. Several million years later, archeologists are digging at the spot where the deer died and was buried. Would the archeologists be able to find a fossil of the deer? Why or why not?
A. Yes, because it would have fossilized before it was buried. B. Yes, because its skeleton could have been replaced by minerals to form a fossil. C. No, because it needed to be fully intact when buried to form a fossil. D. No, because bacteria continued to decompose its skeleton after it was buried.