Which statement is NOT true about retroviruses?
A. cDNA is used as a template to transcribe double-stranded DNA.
B. They contain an enzyme called reverse transcriptase.
C. HIV is a retrovirus.
D. They incorporate themselves into the host cell genome, but replicate independently of the host DNA.
Answer: D
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Which of the following signals is not a signal that may cause a change in gene expression in complex multicellular organisms?
A. oxygen levels B. nutrients in the environment C. temperature D. hormones E. All of these influence gene expression in complex multicellular organisms.
Possessing the entire sequence of a particular human genome may not be as useful as we think. Why not?
A. Every human genome is different enough that knowing ONE human's DNA sequence can't tell us almost anything about ALL humans. B. It's not the DNA sequence that matters-we need to know the mRNA sequence of the human genome. C. Due to the presence of introns/exons, and splicing of RNA after transcription, the DNA sequence doesn't necessarily tell us the exact number/type of proteins that will eventually be made from it. D. The amount of "junk DNA" present in the human genome masks any useful genetic information that we'd like to obtain.
What is the immune function of the placenta in human and marsupial embryo development?
What will be an ideal response?
Of the following countries, which of them
control and have natural resources rights to the Arctic?
a. Russia d. none of these b. Canada e. all of these c. United States