Figure 42.11
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Use the figure above showing human embryonic developmental day 14 to answer the following question.
Which of the following structures represents the yolk sac?
A. A
B. B
C. C
D. D
E. E
Answer: E
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Adenine and thymine are held together by two hydrogen bonds in a double stranded DNA molecule. Indicate whether the statement is true or false
In accordance with the Hardy-Weinberg concept, a population with 80% dominant (A) alleles and 20% recessive (a) alleles would have ____ heterozygous individuals.
A. 4% B. 16% C. 32% D. 64%
People whose kidneys have failed can eat and drink whatever they like as long as they go to dialysis three times a week as scheduled
Indicate whether the statement is true or false
Place the steps in the correct order to reflect how a lethal dose may be determined.1. Dilutions of virus are made to represent a range of concentrations.2. Dilutions are inoculated into susceptible tissue cultures (or susceptible host organisms).3. Inoculated host cells are observed and the number of dead cells are counted.4. The dilution which killed 50% of the tissue culture cells is identified.
Fill in the blank(s) with the appropriate word(s).