The fluid portion of the chloroplast is called the ________.
A. cytoplasm
B. thylakoid
C. matrix
D. gel
E. stroma
Answer: E
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Sequences of genomic DNA and its corresponding messenger RNA (mRNA) are often compared to obtain valuable information for genome annotation. Why is this comparison
A. The open reading frame of the mRNA includes the introns of the genomic DNA. B. The exclusion of introns in mRNA reveals the intron-exon structure of many protein coding genes. C. The genomic DNA is longer because the exons are spliced together. D. The genomic DNA is shorter because the exons are spliced together. E. The sequences of genomic DNA and mRNA are identical, which serves as independent validation.
Advanced treatment of sewage
A. is done to prevent nutrient enrichment. B. is done to prevent possible overproduction of algae and other organisms. C. involves the removal of phosphates and nitrogen compounds. D. All of the choices are correct.
An organ is made up of several
a. biological molecules. b. organ systems. c. tissues. d. cells. e. organisms.
Prior to 500 million years ago, organisms were
unable to venture onto land because a. the earth’s crust was too hot. b. the land was too dry. c. there was not enough oxygen in the atmosphere for respiration. d. the land was not shielded from the sun’s ultraviolet radiation. e. there was no organic matter on land for food