The current theory is that chloroplasts are descendants of symbiotic cyanobacteria that lived within eukaryotic cells. If we look at their respective genomes, however, we see that the cyanobacteria have many more genes than do chloroplasts
Where did these genes go?
A. Restriction enzymes removed them.
B. Endosymbiosis requires a reduction in
genetic material in order to be successful.
C. Many of them were transported to the
nucleus, and others were lost.
D. Nowhere. Cyanobacteria and chloroplasts
actually have the same number of genes.
E. None of the answers options is correct..
C
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A newly described fungus has been isolated from the lungs of several patients experiencing symptoms of pneumonia. All of these patients have a preexisting immunocompromising condition, including four patients with AIDS and two who have been recipients of organ transplants. The natural habitat of this fungal species is the soil.This fungal disease would most likely be classified as a (an) ________ mycosis.
A. cutaneous B. opportunistic C. subcutaneous D. systemic E. superficial
How does habitat fragmentation affect biodiversity?
a. As long as the fragments are of good quality habitat, biodiversity will not be affected. b. Habitat fragmentation increases biodiversity because it reduces entry of exotic species. c. Habitat fragmentation is a threat to biodiversity because small habitat patches sustain only small populations. d. Habitat fragmentation increases biodiversity because adaptation to local conditions stimulates evolution. e. Habitat fragmentation connects terrestrial and aquatic habitats.
What type of fruit is a blackberry?
a. an aggregate of many drupes b. an aggregate of many indehiscent fruits c. an aggregate of many small berries d. a multiple of small berries e. a multiple of small pomes
Mutations vary in how much they affect the phenotype of an organism. Frameshift mutations typically cause more of an impact on phenotype than other mutations. Which describes a situation in which a deletion mutation would NOT result in a frameshift?
A) The deletion occurs at the beginning of a gene. B) The deleted base is adenine. C) The deletion consists of three consecutive bases. D) The deletion is a result of an error in replication.