All of the following are involved in the transport system of the vascular plant EXCEPT
A. Xylem
B. Tracheids
C. Sporangia
D. Vascular tissue
Answer: C. Sporangia
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A male expresses
A. only the homozygous recessive alleles on his X chromosome. B. none of the alleles on his X chromosome. C. only the dominant alleles on his X chromosome. D. both the dominant and recessive alleles on his X chromosome. E. None of the answer choices is correct.
As a consequence of the immune system in humans recognizing dsRNA as foreign,
A) dsRNA viruses rarely infect humans. B) dsRNA viruses quickly transcribe their genes into mRNA which is insensitive to immune responses. C) genomes of RNA viruses are often chemically modified to avoid recognition by human immune cells. D) the genomes of dsRNA viruses must avoid human immune cells during infection, including replicating their genomes within their own nucleocapsids.
Which of the following occurs in both spermatogenesis and oogenesis?
A. Diploid stem cells divide by mitosis to create a large population of precursor cells. B. The developing gametes remain connected to one another via cytoplasmic bridges. C. Polar bodies are produced. D. Four haploid gametes are produced. E. Production of gametes begins at puberty.
If a cell's splicesomes were mutated so they no longer functioned normally, what consequences would result?
A. Introns would remain in the mature mRNA. B. Exons would be missing in the mature mRNA. C. Transcription would cease. D. A functional protein would still be produced. E. RNA processing would remain intact.