In a family, both parents have freckles and widow's peak. Both of these traits are dominant: F = freckles, W = widow's peak. They have a child who has no widow's peak and no freckles. Which one is a possible dihybrid genotype of the child?
A) FfWw
B) ffWw
C) ffww
D) FFww
C
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Membrane-enclosed organelles, such as nuclei, lysosomes, endoplasmic reticulum, mitochondria, and chloroplasts,
A) form specialized compartments within eukaryotic cells for specific functions to occur. B) increase the structural complexity of eukaryotic cells. C) help large eukaryotic cells overcome the limitations of diffusion imposed by their large cell size. D) increase structural complexity, help eukaryotes overcome diffusion limitation due to their size, and form specialized environments for specific functions to occur.
Which of the following cell structures are present in sieve elements, but not in mature vessel elements? Choose all that apply
A. nucleus B. mitochondria C. cell wall D. cytoplasm E. smooth endoplasmic reticulum
Which of the following animals generally has the lowest volume of urine production?
A) a vampire bat B) a salmon in fresh water C) a marine bony fish D) a shark inhabiting the Mississippi River
Assume you have isolated an unknown virus. This virus has a single, positive sense strand of RNA, and possesses an envelope. To which group does it most likely belong?
A) herpesvirus B) picornavirus C) retrovirus D) togavirus E) papovavirus