Which component of the blood is most important for clotting?
A. plasma
B. platelets
C. leukocytes
D. erythrocytes
E. All of the choices listed for this question are important for clotting.
Answer: B
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When scientists used flaps on the same plant to make observations of water flow they were attempting to remove the possibility of:
A. artificial results B. experimental variation C. differentiated results D. separation factors E. alignment factors
Researchers studying the rigidity and flexibility of the cell envelope used chemotaxis to measure the ability of microbes to squeeze through tight spaces. E. coli, a gram-negative bacterium, was able to traverse narrower channels than B. subtilis, a gram-positive microbe, even though both cells are the same size when grown without restriction. E. coli has the more flexible cell envelope because
A. it has only a single membrane. B. lipopolysaccharide has no charge. C. it has fewer flagella. D. there is less structural carbohydrate. E. there are fewer protein receptors.
The event that triggers fruit formation is the growth of a pollen tube through the carpel of a flower. Identify a reasonable hypothesis about the basis of this effect
A) Pollen tubes grow in response to a cytokinin produced by the carpel. B) Pollen tubes grow in response to abscisic acid. C) The growing pollen tube produces ethylene. D) The growing pollen tube produces auxins and/or gibberellins.
How large is the human genome?
A) 3 million base pairs B) 1 trillion base pairs C) 3.2 billion base pairs D) 1 million base pairs E) 10 billion base pairs