Four of the five answers listed below are participants in photosynthesis. Select the exception
a. photosystem
b. chlorophyll
c. mitochondrion
d. chloroplast
e. thylakoid membrane
c
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Huntington's disease is caused by a single dominant allele. It is a lethal disease, yet it persists in the human population. Which of the following statements best describes why?
A. Huntington's disease is sex-linked and every human has at least one X chromosome; thus, the chances are extremely high for this allele to be maintained in the human population. B. Huntington's disease can present symptoms so mild that they appear to lack dominant expression of the allele in some individuals; in those cases, the allele is passed on to the offspring. C. While lethal to a parent, Huntington's disease will not be lethal to the offspring since it can skip a generation. D. Huntington's disease presents symptoms in mid-life, after most people have already had offspring. E. Even though Huntington's disease is lethal, it improves chances for reproduction before the person dies.
To express a gene, DNA is first transcribed into a corresponding strand of
A) mtDNA. B) rRNA. C) mRNA. D) tRNA.
The female gametophyte generation of angiosperms is represented by:
A) seeds. B) embryo sacs. C) pollen tubes. D) pollen grains.
The figure below demonstrates which key concept regarding cell activities?
- enzyme inhibition - the first law of thermodynamics - coupled reactions - active transport - receptor-mediated endocytosis