During the life of a tunicate, the notochord
a. is present throughout life.
b. appears only in the larva.
c. develops during adulthood.
d. is completely absent.
e. changes into the nerve cord.
Answer: b
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a. 1 b. 2 c. 3 d. 4 e. 5
The function of lactoferrin in the mucous membranes is to
A) Hydrolyze peptidoglycan B) Reduce the amount of iron available to microbes C) Lyse the plasma membrane D) Damage DNA
When the genome of a particular species is said to include 20,000 protein-coding regions, what does this imply?
A. Any other regions are "junk" DNA. B. There are also genes for RNAs other than mRNA. C. Each gene codes for one protein. D. The species is highly evolved. E. There are 20,000 genes.
Which of the following represents the genotype of a male who is color-blind?
A. XbXb B. XBY C. XbY D. XBXB E. XBXb