What molecular mechanism/feature does site-directed mutagenesis exploit to introduce a mutation at a specific site?
A) flanking complementary bound nucleotides permit non-complementary base pairing
B) methylated nucleotides disrupt DNA polymerase's proofreading
C) nucleotide substitution when one is depleted
D) transposase-induced base pair changes
Answer: A
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Small circular pieces of bacterial DNA that are used as vectors in cloning experiments are called _____
A. phages B. viruses C. plasmids D. chromosomes
Which of the following is not a shape seen in prokaryotes?
A. Spheres B. Rods C. Spirals D. Icosahedrals
Respond to statements 126–130 in reference to the five
components of mammalian blood listed below. a. red blood cells b. basophils c. platelets d. albumin e. sodium and potassium chloride E 126. This blood component plays a central role in clotting blood following a wound. E 127. This blood component contains hemoglobin. E 128. This blood component helps to maintain the proper osmotic concentration of the blood. E 129. This blood component plays a role in inflammation. E 130. Oxygen is transported throughout the body by this blood component.
If motility is considered a characteristic of animals, then why are stationary creatures such as sponges still considered to be animals?
What will be an ideal response?