In 1964, Nirenberg and Leder used the triplet binding assay to determine specific codon assignments. A complex of which of the following components was trapped in the nitrocellulose filter?
A) sense and antisense strands of DNA
B) charged tRNA, RNA triplet, and ribosome
C) ribosomes and DNA
D) uncharged tRNAs and ribosomes
E) free tRNAs
Answer: B
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Which of the following is TRUE of cell cleavage?
A. It involves consecutive cycles of cell division without cell growth. B. It forms a blastula. C. It is a rather slow event of embryonic development. D. It involves consecutive cycles of cell division without cell growth and forms a blastula. E. It is a rather slow event of embryonic development involving consecutive cycles of cell division.
Despite the aggressive defense of the cardiovascular system by the immune system, some microbes can invade and establish an infection in the blood. From the following list of microbes and their virulence factors, identify the mismatch.
A. Borrelia burgdorferi changes its surface antigens to avoid immune recognition. B. Coxiella burnetii produces an endospore-like structure. C. Trypanosoma cruzi cloaks itself in host proteins to avoid immune recognition. D. Bacillus anthracis produces antioxidants to combat lysosomes.
Which form of spore formation offers the promise of more variability in the offspring?
A) asexual spore formation B) sexual spore formation
The ____ is an extension of the upper body wall in mollusks.
A. radula B. mantle C. gill D. lung E. siphon