Answer the question using the accompanying figure. The function of the structure labeled "9" is ____
a. food intake
b. digestion
c. sexual reproduction
d. water discharge
e. asexual reproduction
ANSWER: d
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A ribosome is made of
a. rRNA and proteins. b. tRNA and rRNA. c. tRNA, rRNA, and mRNA. d. rRNA and mRNA. e. tRNA, rRNA, and proteins.
Which of the following is not a reason why Clostridium difficile is an increasing concern in healthcare settings?
A) antibiotic misuse and overuse in the population B) antibiotic resistance C) emerging superstrains that make a third type of toxin D) the bacterium can naturally escape drugs and disinfectants by retreating into a resistant spore state E) additional modes of transmission have occurred in several isolated cases
There are some similarities between prokaryotic and eukaryotic cells. Which of the following structures is found in both prokaryotic and eukaryotic cells?
A. lysosome B. mitochondrion C. nucleus D. ribosome
How many codons are there for leucine?
A. two B. three C. five D. six E. four