Body cells of human females contain _____
a. one X chromosome
b. two X chromosomes
c. one Y chromosomes
d. two Y chromosomes
e. one X and one Y chromosome
ANSWER: b
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Which aspect of phospholipids is most important to the formation of bilayers?
A) They are amphipathic. B) Their size is large, relative to cholesterol. C) Their size is small, relative to fats. D) Their hydrocarbon tails can consist of fatty acids or isoprene subunits.
Sequencing eukaryotic genomes is more difficult than sequencing genomes of bacteria or archaea because of the _____
A) large size of eukaryotic proteins B) hard-to-find proteins C) high proportion of G-C base pairs in eukaryotic DNA D) large size of eukaryotic genomes and the large amount of eukaryotic repetitive DNA
At which stage of meiosis are sister chromatids separated from each other?
a) anaphase II b) prophase I c) prophase II d) anaphase I
All of the following organisms produce exotoxins EXCEPT
A) Salmonella typhi. B) Clostridium botulinum. C) Corynebacterium diphtheriae. D) Clostridium tetani. E) Staphylococcus aureus.