Which one of the following methods of enhancing fertility involves the placement of sperm and unfertilized eggs into the oviduct?
A) artificial insemination
B) in vitro fertilization
C) gamete intrafallopian transfer (GIFT)
D) hysteroscopy
E) zygote intrafallopian transfer (ZIFT)
C
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Answer the following statements true (T) or false (F)
1. Viruses can infect plants and animals, but none known that infect bacteria. 2. Many viruses are inhibited by antibiotics. 3. "Life" is defined for any particle, substance, or object as anything which is not dead. 4. The kingdom is the most all-inclusive taxonomic category. 5. The cell is the basic unit of life.
A tRNA molecule is "bilingual" because it "speaks the language of" or binds to
A. amino acids and DNA B. DNA and mRNA codons C. promoters and amino acids D. codons of mRNA and amino acids E. promoters and terminators
Which one of the following structures is characteristic of BOTH eukaryotic and prokaryotic cells?
A) nucleus B) mitochondria C) endoplasmic reticulum D) cell membrane E) Golgi apparatus
Under high tryptophan conditions, tryptophan binds to and activates the repressor protein, thereby blocking
transcription of the trp operon. This is an example of: a. protein degradation. b. negative control of inducible genes. c. negative control of repressible genes d. positive control of inducible genes. e. positive control of repressible genes.