#Question id: 11798
#Section 6: Plant, Animal and Microbial Biotechnology
Companion cells transport of photosynthetic products from producing cells in mature leaves to the sieve elements in the minor veins of the leaf. There are at least three different types of companion cells in the minor veins of mature, exporting leaves, All three cell types have dense cytoplasm and abundant mitochondria;
#Question id: 2020
#Section 2: General Biology
Which statement best describes the difference in responses of effector B cells (plasma cells) and cytotoxic T cells?
#Question id: 2291
#Section 3: Genetics, Cellular and Molecular Biology
Ribosomes are found
#Question id: 4822
#Section 3: Genetics, Cellular and Molecular Biology
In a particular species of mammal black hair (B) is dominant to green hair (b) and red eyes (R) are dominant to white eyes (r). If a BbRr individual is mated with a bbrrindividual the expected phenotypic ratio of the offspring is 1 black-red : 1 black-white: 1 green-red : 1 green-white. However, when you mate these individuals you find that the phenotypic ratio of the offspring is 6 black-red :1 black-white : 1 green-red : 6 green-white. What could account for this difference?
#Question id: 3700
#Section 3: Genetics, Cellular and Molecular Biology
In the Meselson-Stahl DNA replication experiment, if the cells were first grown for many generations in 15N containing media, and then switched to 14N containing media, what percent of the DNA had 1 light strand and 1 heavy strand after 2 generations of growth in 15N growth media?