#Question id: 4742
#Unit 8. Inheritance Biology
In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females are ZW. A recessive lethal 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?
#Question id: 3831
#Unit 3. Fundamental Processes
State whether the following statements is true/false regarding DNA replication.
1. In E. coli replication begins at the origin of replication and proceeds in one direction until the entire circular DNA molecule has been copied.
2. The chromosome of the fruit fly (D. melanogaster) is about twice as large as the E. coli chromosome.
3. Prokaryotic DNA replication occurs in two steps. First, ATP provides a phosphate to the growing DNA chain. This is followed by addition of a nucleoside.
4. DNA polymerase III is the largest DNA polymerase in E. coli.
5. The β subunits of E. coli DNA polymerase form a sliding clamp that surrounds the DNA strands at the replication fork.
#Question id: 1203
#Unit 4. Cell Communication and Cell Signaling
People who suffer from thyroid adenomas have constitutively activated G proteins in some cells of the thyroid gland. Tumor cells not only secrete copious quantities of thyroid hormones but also divide and grow excessively. Based on these observations, in what kind(s) of signal transduction pathways do the mutant G proteins participate?
#Question id: 3009
#Unit 2. Cellular Organization
Endospores are
#Question id: 12138
#Unit 10. Ecological Principles