Which statement is CORRECT concerning animal viruses?
a. Enveloped viruses are surrounded by a lipid and carbohydrate coat, which is made from the host cell's mitochondria.
b. The genome of animal viruses is always single-stranded.
c. Capsid proteins are produced in the nucleus.
d. Retroviruses use an enzyme called reverse transcriptase, which synthesizes DNA by copying RNA.
Answer: d. Retroviruses use an enzyme called reverse transcriptase, which synthesizes DNA by copying RNA.
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Match each stage with the events listed
a. sister chromatids move apart b. chromosomes start to condense c. new nuclei form d. all duplicated chromosomes are aligned at the spindle equator________ metaphase________ prophase________ telophase________ anaphase
An important reason that the nervous system and the endocrine systems are closely linked is _____
a. neurons and endocrine cells develop from an embryo’s ectodermal layer b. produce the same outcomes c. are regulated by the adrenal cortex d. are homologous e. are regulated by the brain
Using PGD to screen for embryos that would become suitable donors for siblings is illegal under any
circumstance. Indicate whether the statement is true or false.
Studies in knockout mice have demonstrated an important role of the FOXP2 transcription factor in the development of vocalizations
Recent sequence comparisons of the FOXP2 gene in Neanderthals and modern humans show that while the DNA sequence may be different, the protein sequence it codes for is identical. What might logically be inferred from this information? A) There was a problem with the experiment because different DNA sequences cannot result in the same protein sequence. B) The differences in DNA sequence support the hypothesis that Neanderthals were primitive beings that could only grunt. C) Human and Neanderthal vocalizations may have been more similar than previously thought. D) The experiments in mice demonstrating the function of the FOXP2 gene are not relevant to humans and Neanderthals because they are not primates.