When E. coli cells produce the amino acid tryptophan, a cluster of five genes is transcribed together. This cluster of genes is referred to as the
A. trp operon.
B. trp regulator.
C. trp suppressor.
D. trp transcriptional operator.
E. trp promoter.
Answer: A
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Based on the data in the figure above, which of the following statements are correct?
I) Area 1 would be considered a desert because of its high average temperature. II) Area 1 has more average precipitation than Area 2. III) Area 2 would be considered a desert because of its low average precipitation. IV) Area 2 has a larger annual temperature variation. A) only I and III B) only II and IV C) only I, II, and IV D) only II, III, and IV E) only I, II, and III
When sea turtle eggs hatch, predators gather and mortality among the hatchlings is extremely high. Once turtles reach adult size, they can live for decades. This is an example of type ____ survivorship
Fill in the blank with the appropriate word.
Fungi called Deuteromycetes are not known to reproduce sexually. Nonetheless, most of them are considered members of the ________ on the basis of genetic sequences
A) Zygomycota B) Basidiomycota C) Ascomycota D) Sporozoa E) Rhizaria
____________ is a thick fluid inside the chloroplast membrane. Suspended within it are disk-like membranous sacs known as _____________.
A) The stroma; thylakoids B) The stroma; grana C) Cytoplasm; mitochondria D) Cytoplasm; organelles E) Cytoplasm; stroma