The black spots seen on a moldy piece of bread are which part of a zygomycete?
A. the sporangia
B. the hyphae
C. the mycelium
D. the rhizoids
E. the zygotes
A
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Tropical leafcutter ants collect leaf cuttings which they transport to special underground chambers. There, they chew the leaves to create nursery beds on which they grow a species of fungus they use for food
When ant queens disperse to establish new colonies, they carry the fungus with them, dispersing it as well (this benefits the fungus). In the ants' nest, the fungus is at risk of being destroyed by another fungal species that is able to grow in the same habitat, using the same limited resources. On their bodies, the ants carry and provide a home for bacteria that produce antibiotics the ants use to kill this second fungus and thereby protect their food supply. In this system, the relationship between the leafcutter ants and their fungal food species is: A. interspecific competition. B. mutualism. C. predation. D. parasitism. E. commensalism.
A patient in his forties is diagnosed with Huntington disease. The patient's mother is healthy and a genetic evaluation shows 25 and 26 CAG repeats within her HTT alleles
The patient's father died at age 24 when the patient was 2 and no genetic evaluation can be done. It is most likely that: A. the father was heterozygous for the defective HTT allele. B. the father was homozygous for the defective HTT allele. C. the mother is a carrier for the defective HTT allele. D. the HTT gene acquired additional CAG repeats during the 40 years of the patient's life.
Morgan's student Sturtevant demonstrated that the recombination frequencies between a series of linked genes is additive. Examine the following recombination data from Sturtevant, and determine the proper order of the genes on the Drosophila X chromosome. Assume y is in the 0.0 position.Gene 1 Gene 2 Recombination frequencyyellow(y) vermilion(y) 0.322vermilion miniature(m) 0.030white(w) vermiliom 0.297yellow white 0.010white miniature 0.337
A. y m v w B. y w m v C. y w v m D. y m w v
Saturated fats are usually in _______ form and are derived from _________.
Fill in the blank(s) with the appropriate word(s).