When two organisms do not mate because they breed at different times of the year, they are exhibiting ____
reproductive isolation.
a. behavioral
b. ecological
c. gametic
d. mechanical
e. temporal
ANSWER: e
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Exceptions to the genetic code have been identified. Which one of the following is a known exception?
A. A codon might not always encode the same amino acid. B. A single stop codon, UGG, may be the only stop codon recognized. C. Alanine codons instead of methionine codons may be used for the initiation of translation. D. The codons in mitochondria are reversed (e.g., instead of AUG, the methionine codon in mitochondria is GUA).
Which of the following is a bacterium known
to cause stomach ulcers?
a. Clostridium botulinum b. Staphlococcus aureus c. Escherichia coli d. Helicobacter pylori e. Lactobacillus acidophilus
In this section of the tissue layers of a cnidarian, which item, A, B, C, or D, is a nematocyst?
1.A
2.B
3.C
4.D
what does CTL target?
What will be an ideal response?