Which term refers to a young moss gametophyte?
a. antheridium
b. capsule
c. protonema
d. prothallus
Ans: c. protonema
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Direct penetration of which of the following worms results in tissue damage at the site of attachment, blood loss, and an acute gastrointestinal phase demonstrated by an increased eosi-nophilia?
a. Whipworm b. Pinworm c. Threadworm d. Hookworm
Why was the nucleus removed from the egg cell used to create Dolly, the cloned sheep?
a. to remove the mitochondrial DNA of the egg donor b. to test whether the genetic contribution from a sperm cell alone could produce a lamb c. to create a cloned sheep in the absence of DNA d. since the genome for the clone was supplied by the diploid mammary cell, the presence of the egg cell DNA would result in triploidy e. to see whether egg cell DNA injected into a sperm cell could produce a lamb
What kind of mutation occurs when one base is changed to another at a single location in the DNA?
A) Insertion B) Neutral C) Deletion D) Substitution
Why must water that has moved to the interstitial fluid in the medulla be quickly removed from the interstitial fluid?
A) to prevent dilution of urine B) to prevent destruction of the concentration gradient necessary for water reabsorption C) to equilibrate the concentration of solutes in the cortex and medulla D) to maintain an environment for transport of nutrients