In studying the dance of the honeybees, Karl von Frisch determined the duration of dance conveyed the ____ of the
food and the angle of the dance conveyed the ____ of the food.
a. direction; distance
b. distance; direction
c. type; direction
d. direction; type
e. distance; type
ANSWER: b
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Why are genes associated with nitrogen fixation not typically used to identify bacteria species? (Select all correct choices.)
A. Their sequences are similar to those of rRNA genes. B. These genes are not typically exchanged between bacteria by horizontal gene transfer. C. These genes are often exchanged between bacteria by horizontal gene transfer. D. Every bacterium contains nitrogen fixation genes.
Coarse-textured soils have a low field capacity and a low wilting point
Indicate whether the statement is true or false
Which of the following does not apply to eukaryotic gene regulation?
A) gene regulation by attenuation B) regulation as a result of compartmentalization C) mRNA degradation (turnover) D) protein degradation (turnover) E) protein folding
In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females are ZW. A lethal recessive allele that causes death of the embryo is sometimes present on the Z chromosome in pigeons. What would be the sex ratio in the offspring of a cross between a male that is heterozygous for the lethal allele and a normal female?
A) 2:1 male to female B) 1:2 male to female C) 1:1 male to female D) 4:3 male to female E) 3:1 male to female