Your father is heterozygous for the recessive disorder phenylketonuria (PKU). You know your mother has two "good"
alleles. You have a ____chance of having the disorder.
a. 0%
b. 100%
c. 25%
d. 50%
e. 75%
ANSWER: a
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In a prokaryotic operon, the region to which RNA polymerase binds is called
a. the heterogeneous nuclear DNA. b. the repressor gene. c. the promoter sequence. d. the operator sequence. e. all enhancer gene.
In his studies of colonization of hard substrates by various subtidal invertebrates, Michael Keough found that, among isolated bare patches, __________ more successfully colonized the smaller patches.
A) the better competitors, tunicates and sponges, B) the disturbance-adapted species, bryozoans and polychaetes, C) the large predators, such as starfish, D) microbial films, consisting of bacteria and fungi,
If lithium has an atomic number of 3 then it will have one valence electron.
Answer the following statement true (T) or false (F)
Fungal infections are called
A) mycoses. B) dimorphic. C) coencytic. D) sporgangia. E) basidium.