#Question id: 4943
#XL - T Zoology
In what way were conditions on the early Earth of more than 3 billion years ago different from those on todayʹs Earth?
#Question id: 3858
#XL - Q Biochemistry
The 5' methyl guanosine caps added during RNA chain elongation performs what function?
1. prevents degradation by nucleases
2. are recognized by protein factors
3. are used to identify the type of RNA
#Question id: 1608
#XL - S Microbiology
Pattern recognition receptors (PRR) include which of the following?
#Question id: 4742
#XL - R Botany
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: 1114
#XL - Q Biochemistry
Sutherland discovered that the signaling molecule epinephrine is responsible for which of the following events?