Which of the following is NOT a true
statement about the evolution of immunity?
a. immunity evolved before there were
multicelled eukaryotes
b. nonself recognition evolved about 1 billion
years ago
c. innate immunity evolved out of adaptive
immunity
d. ways of indentifying “self” evolved after
multicelled eukaryotes evolved
e. more than one of these statements is NOT
true about the evolution of immunity
C
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Blood pressure is measured with a(n) ________ and a stethoscope
Fill in the blank(s) with correct word
Which one of the following explanations does not describe why generating transgenic animals is more difficult than plants?
A) The intracellular environment of an animal can be much different than bacteria and even plants. B) Animal cells do not readily take up plasmid DNA like plant cells. C) The techniques for cloning animals from a single cell are more challenging than for plants. D) Genetic material must be inserted into a fertilized egg, then implanted into a living animal; plants can be grown in culture media, and thus, there is no need for implantation. E) Genetic material is introduced to animal cells in culture media and the animal is allowed to mature in the culture media.
Transcription is a process that occurs in cells. Which is the best description of transcription?
A) A DNA template is used to generate RNA. B) A DNA sequence is used to activate enzymes in a cell. C) DNA is copied. D) A RNA template is used to make proteins.
Sulfa antibiotics damage bacteria by affecting a certain bacterial enzyme. The sulfa antibiotic looks similar to a substrate normally required by the bacterial cells to live
The sulfa antibiotic occupies the active site of the required enzyme and blocks entry of its normal substrate. This prevents the bacteria from making nucleotides that are required for their reproduction and survival. Based on this information, the action of sulfa antibiotics is an example of A) activation energy. B) denaturing of proteins. C) electron carriers. D) competitive inhibition.