As mesodermal structures rearrange during early development, spaces that open up merge to form the ____
a. coelom
b. colon
c. notochord
d. mouth
e. anus
ANSWER: a
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A cross of pea plants, both heterozygous for seed shape and color traits, resulted in progeny in the ratio 9/16 round yellow (R_Y_), 3/16 round green (R_yy), 3/16 wrinkled yellow (rrY_), and 1/16 wrinkled green (rryy)
This result demonstrates that the: A. alleles responsible for seed color are segregating but those responsible for shape are not. B. alleles of seed shape and color are segregating independently. C. phenotypes corresponding to seed shape are segregating 1:2:1. D. alleles governing seed color display codominance. E. alleles for seed shape and color are linked.
Which contractile protein pulls the plasma membrane inward to begin cytokinesis?
a. myosin b. titin c. actin d. troponin e. tropomyosin
The vector involved in African sleeping sickness is the ________.
A. tsetse fly B. hard-bodied tick C. sand fly D. reduviid "kissing" bug E. Anopheles mosquito
What is a trace element?
A) An element that is very rare B) An element that is evenly distributed on the planet C) An element that is required in miniscule amounts for life D) An element that is used to identify the location of other elements