Four of the five systems listed below are produced
by the same germ layer. Select the exception.
a. nervous
b. muscle
c. circulatory
d. reproductive
e. excretory
Answer: a
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In humans, if non-disjunction led to an individual with a genotype of XXY, that person would
A. be female because each cell has two X chromosomes. B. be male because each cell has one Y chromosome. C. display both male and female characteristics. D. not survive.
If a virus enters the lytic phase in a host's cell, it will cause the host cell to
A. reject the virus. B. shrink because of the loss of cytoplasm that has been used in the synthesis of viral DNA. C. lysis due to the action of enzymes D. replicate itself at a higher than normal frequency. E. initiate an attack on the virus.
An embryo sporophyte surrounded by nutritive tissue and a tough, protective outer coating makes up a(n) ____
a. pollen grain b. spore c. ovule d. seed e. strobilus
Prokaryotes have traditionally been classified by numerical taxonomy, which compares all of the following traits except ________
a. shape b. gene sequencing c. cell wall properties d. metabolism