What major benefits do plants and mycorrhizal fungi receive from their symbiotic relationship?
A) Plants receive enzymes, and fungi receive nitrogen and phosphorus.
B) Plants receive increased root surface area, and fungi receive digestive enzymes.
C) Fungi receive photosynthetic products in exchange for living in plant root nodules.
D) Plants receive nitrogen and phosphorus, and fungi receive photosynthetic products.
D
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You are performing a fruit fly cross similar to those that Morgan performed. Unfortunately, you forgot to write down the parents of your cross
You count the progeny, and find you have 40 red-eyed males, 80 red-eyed females, and 40 white-eyed males. Assuming that all genotypes from this cross should have equal survival rates, what are the genotypes of the parent flies? A. XwY and Xw+Xw+ B. XwY and Xw+Xw C. Xw+Y and Xw+Xw D. Xw+Y and XwXw
Organelles protect a cell by
A) sequestering biochemicals that could dismantle other cellular structures. B) forming a thick outer barrier. C) containing powerful enzymes that kill any bacteria that enter. D) placing flag-like molecules on a cell's surface, which identify that cell as belonging to a particular person.
A proficient engineer can easily design skeletal structures that are more functional than those currently found in the forelimbs of such diverse mammals as horses, whales, and bats. The actual forelimbs of these mammals do not seem to be optimally arranged because _____.
A) natural selection has not had sufficient time to create the optimal design in each case, but will do so given enough time B) in many cases, phenotype is determined by genotype and the environment C) though we may not consider the fit between the current skeletal arrangements and their functions excellent, we should not doubt that natural selection ultimately produces the best design D) natural selection is generally limited to modifying structures that were present in previous generations and in previous species
Eukaryotic cells can be found in all of the following organisms EXCEPT:
A) plants B) bacteria C) fungi D) animals