The ____ absorb nutrients through their plasma membranes and lack food vacuoles
a. golden algae
b. apicomplexans
c. dinoflagellates
d. diatoms
e. red algae
ANSWER: b
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The response to touch by such plants as the sensitive plant is due to:
A. changes in water content of cells B. changes in electrical impulses at the touched area C. auxin displacement in the touched area D. effect of gibberellins on the area affected E. sensitive responder cells
The Y chromosome was challenging to sequence because
A) it is very small. B) the sequence has many sites of high symmetry called palindromes. C) it is very similar to the X chromosome. D) not enough men volunteered to have their Y chromosomes sequenced.
In Drosophila melanogaster there is a sex-linked gene for eye color that is found only on the X
chromosome. The allele for red eye color (Xw+) is dominant over the allele for white eye color (Xw). You examine a vial of 100 flies that are all offspring from a single genetic cross. You find only redeyed females and red-eyed males present. Flies from the vial were allowed to interbreed, and in the next generation you find only red-eyed females, but you find both red-eyed and white-eyed males. The genotypes of the original parents were
a. Xw+Xw+; XwY. b. Xw+Xw; XwY. c. XwXw; Xw+Y. d. Xw+Xw; Xw+Y. e. XwXw; XwY.
A recessive allele in tigers causes the white tiger. If two normally pigmented tigers are mated and produce a white offspring, what percentage of their remaining offspring would be expected to have normal pigmentation?
A) 25% B) 50% C) about 66% D) 75% E) about 90%