After much debate, it is decided that the family will vacation at Myrtle Beach in South Carolina this year. Swimsuits and other beach accoutrements are purchased and packed. Unfortunately, upon arrival, they are faced with signs that say, “WARNING! Beware: Portuguese men-of-war have been spotted along the shore! Beaches closed until further notice.” Upon returning home, the oldest child exclaims, “I never thought jellyfish could ruin our whole vacation!” The parents frown at the child, for they are biologists and he has committed a grave taxonomic error. What error has he made?
a. Portuguese men-of-war are not jellyfish, they are Scyphozoans.
b. Portuguese men-of-war are not jellyfish, they are Anthozoans.
c. Portuguese men-of-war are not jellyfish, they are Hydrozoans.
d. Portuguese men-of-war are not jellyfish, they are Cubozoans.
c. Portuguese men-of-war are not jellyfish, they are Hydrozoans
You might also like to view...
Natural selection operates directly on
(a) the genotype. (b) individual alleles. (c) the phenotype. (d) color only.
The domain Archaea was discovered in the mid-1970s. Despite the recent start to investigations of archaeal species, some general chromosome and genome characteristics are clear
Which of the following similarities have been found between archeae and bacteria? A) they have no nucleus B) they are haploid C) a high percentage of the genome encodes proteins D) many genes share promoters E) all of the above
A condition in which the placenta forms in the lower half of the uterus and covers the cervix, which may result in premature birth or maternal hemorrhage, is called ________
A) cesarean section B) neural tube C) colostrum D) placenta previa
The DNA duplex consists of two long covalent polymers wrapped around each other many times over their entire length. The separation of the DNA strands for replication causes the strands to be "overwound" in front of the replication fork
How does the cell relieve the torsional stress created along the DNA duplex during replication? (a) Nothing needs to be done because the two strands will be separated after replication is complete. (b) Topoisomerases break the covalent bonds of the backbone allowing the local unwinding of DNA ahead of the replication fork. (c) Helicase unwinds the DNA and rewinds it after replication is complete. (d) DNA repair enzymes remove torsional stress as they replace incorrectly paired bases.