Media in which all components and their concentration are known are called ________ media.
A. defined
B. selective
C. enrichment
D. transport
Answer: A
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If two individuals with different distinct characteristics are mated, their offspring is called a _______
A. strain B. true-breeding line C. gamete D. cross E. hybrid
Familial hypercholesterolemia is a genetic disease that affects approximately one in 500 people worldwide. There is more than one genetic cause of the disease. Class I is often described as an autosomal dominant disease. Affected individuals have cholesterol levels >250 as children and often >300 as adults. However, homozygotes have cholesterol levels of >600 as children and can die of heart attacks in their 20s. These individuals entirely lack a functional LDL receptor.
Which of the following would be the best description of the inheritance of this form of hypercholesterolemia? A) Dominant epistatic B) Codominant C) Incompletely dominant D) Complementary E) Recessive epistatic
What is the correct sequence of structures through which the filtrate would pass?
1) Bowman's capsule 2) collecting duct 3) distal convoluted tubule 4) proximal convoluted tubule 5) ascending loop of Henle 6) descending loop of Henle a. 1 ? 3 ? 4 ? 5 ? 6 ? 2 b. 1 ? 4 ? 5 ? 6 ? 3 ? 2 c. 1 ? 6 ? 5 ? 4 ? 3 ? 2 d. 1 ? 3 ? 4 ? 2 ? 6 ? 5 e. 1 ? 4 ? 6 ? 5 ? 3 ? 2
A fertility doctor is trying to determine why a couple is infertile. It has been determined that the woman is fertile, so the problem may be with the man. In analyzing his semen, the doctor notices adequate sperm production, but the sperm are largely
inactive. He concludes that the semen may be lacking in proper nutrients for the sperm. Which structure would be the most likely candidate for the source of the problem? A) vas deferens B) seminiferous tubules C) seminal vesicles D) urethra