In many bacteria, genes that confer resistance to antibiotics are carried on
A) F factors.
B) R plasmids.
C) introns.
D) exons.
Answer: B
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You find a new species of worm and want to classify it. Which of the following lines of evidence would allow you to classify the worm as a nematode and not an annelid? A) It undergoes protostome development
A) It undergoes protostome development. B) It is segmented. C) It is triploblastic. D) It has a coelom. E) It sheds its external skeleton to grow.
One of the reasons why the model systems of yeast, Arabidopsis, nematode worms, fruit flies, and mice are so often used to study functional analysis of genes is because
A. they all have only a few chromosomes. B. they are easy to cross with each other and observe polyploidy effects. C. they have short life cycles. D. they are easy to observe in the wild. E. they mutate easily leading to new genomic variations.
A selectively ________ membrane is one that allows some molecules to pass through but not others.
Fill in the blank(s) with the appropriate word(s).
Which of the following CANNOT be repaired by nucleotide excision repair (NER)?
A. chemically modified bases B. ultraviolet-induced damage C. missing bases D. mismatched bases E. pyrimidine dimers