Crossing over mixes up _____
a. chromosomes that are not homologous pairs
b. alleles on homologous pairs
c. zygotes
d. gametes
e. sister chromatids
b
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Development of an animal is connected to the genes that are expressed during development. Researchers propose that ...
A. increases in the number of Hox genes have been instrumental in the evolution of many animal species. B. the greater the number of Hox genes the more complex the body plan of the animal. C. both BMP4 and Hox are associated only with digit development in animals. D. increases in the number of Hox genes have been instrumental in the evolution of many animal species and the greater the number of Hox genes the more complex the body plan of the animal are both correct. E. increases in the number of Hox genes have been instrumental in the evolution of many animal species, the greater the number of Hox genes the more complex the body plan of the animal, and both BMP4 and Hox are associated only with digit development in animals are all correct.
While they are simple relative to cells, viruses often have a very diverse collection of components. Which one of the following choices is LEAST likely to be found as part of a virus?
A. proteins with functional binding sites B. membrane components C. single-stranded DNA D. ribosomes E. glycoproteins Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about virus structure? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Kinesin 1 and myosin II share each of the following features except
A) two heads. B) dimers formed by heavy chain tails coiled around each other. C) formation of bipolar filaments. D) plus end directed motor activity. E) ATPase activity.
Over the course of evolutionary time, animal body sizes have gotten larger, yet cell sizes have not. Cells have stayed proportionally the same size to remain efficient, because
A) if cells got larger, the demand for energy and raw materials would greatly decrease. B) larger cells would become limited by the ability to move materials across the plasma membrane. C) of limitations of the composition of the plasma membrane. D) of the inability of the nucleus to produce sufficient DNA for larger cells. E) the Golgi apparatus would not be able to meet the demands of cell transport of larger cells.