#Question id: 1091
#Unit 4. Cell Communication and Cell Signaling
Why does testosterone, a lipid-soluble signaling molecule that crosses the membranes of all cells, affect only target cells?
#Question id: 5804
#Unit 8. Inheritance Biology
The gene that is mutated in cases of cystic fibrosis encodes an ion transporter protein normally expressed in the respiratory and digestive tracts along with other locations. Individuals homozygous for the most common mutation in this gene (ΔF508) died at very early ages prior to the advent of advanced medical intervention. Despite this, the mutation exists at relatively high frequency in populations of European descent. One potential explanation is that heterozygotes for such mutations may be relatively immune to the lethal effects of diseases such as typhoid fever. Which statement below is most accurate?
#Question id: 795
#Unit 1. Molecules and their Interaction Relevant to Biology
A single-stranded DNA molecule contains 40 nucleotides and has the sequence 5’-(GA)20-3’. When this single strand binds to a complementary DNA strand,
#Question id: 11622
#Unit 8. Inheritance Biology
If a cross is made between two parental homozygous allele female Red phenotype (RR) cross with male white phenotype (rr) resulting F1 progeny is all red phenotype (Rr), if reciprocate this cross the resulting progeny will be change.
a) Gene expression will be the parental origin dependent
b) uniparental gene contribution and also the expression of the gene is uniparental
c) Gene expression independent over parental origin
d) Gene contribution is biparental but the expression of the gene is uniparental
This prediction concludes that,
#Question id: 18704
#Unit 13. Methods in Biology