If A is dominant to a and B is dominant to b, what is the expected phenotypic ratio of the cross AaBb × AaBb?
A) 16:0:0:0
B) 8:4:2:2
C) 1:1:1:1
D) 9:3:3:1
Answer: D
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Which of the following statements best defines the feature(s) linking all animals, but separating them from all other organisms?
A. They are terrestrial or secondarily aquatic. B. They have digestive enzymes. C. They are heterotrophic. D. The nature of their small subunit rRNA gene sequences is different. E. All of the choices provided are correct.
Two true-breeding mutant strains of Drosophila have black body color instead of the wild-type gray yellow. When the two strains are crossed, all the F1 flies have wild-type body color. How can these data be interpreted?
A) Recombination occurred. B) Complementation occurred. C) The mutations involved are on two different genes. D) A new mutation occurred in all the offspring. E) Both B and C
Each antenna complex absorbs light energy and transfers it to its reaction center, which consists of chlorophyll
molecules and ____. a. P680 b. proteins c. carotenoids d. accessory pigments e. thylakoid membranes
T-independent antigens
A) may be polysaccharides or proteins, and are not able to bind multiple B cell receptors on a given B cell. B) are usually polysaccharides and able to bind multiple B cell receptors on a given B cell. C) are able to bind multiple B cell receptors on a given B cell. D) are usually proteins. E) are usually polysaccharides.