Retroviruses ____
a. have DNA genomes
b. use an RNA intermediate to replicate their genome
c. replicate their RNA genome directly to produce progeny RNA genomes
d. do not have an envelope
e. require reverse transcriptase to replicate their genome
ANSWER: e
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Placozoans (select all that apply)
A. are tiny animals containing only a few thousand cells. B. are simple animals, consisting of only 2 tissue layers that sandwich an interior fluid layer. C. are, in spite of their morphological simplicity, genetically complex, sharing many genes for transcription factors, signaling molecules, and structural proteins with both cnidarians and bilaterians animals. D. are a highly diverse group, consisting of many species occupying a wide range of habitats. E. are large radially symmetrical animals superficially similar to cnidarians and ctenophores.
As a result of being cloned, Dolly exhibited abnormalities not seen in normally reproduced sheep. One of these abnormalities was she
A. developed arthritis in her hind legs. B. was able to reproduce asexually, without requirement of a male sperm. C. developed lung disease at a young age of six years. D. developed arthritis in her back. E. gave birth to healthy lambs through normal sexual reproduction.
Which gland produces both aldosterone and cortisol?
a. hypothalamus b. adrenal cortex c. anterior pituitary d. thyroid e. pineal
A carnivore is usually a(n)
A) secondary producer. B) autotroph. C) primary producer. D) secondary consumer. E) primary consumer.