A membrane is examined using freeze-fracture and freeze-etch analysis. The surfaces are shown to have almost no pits or bumps. Which of the following is the most likely source of the membrane?

#Question id: 2291

#Unit 2. Cellular Organization

Ribosomes are found

#Question id: 3376

#Unit 11. Evolution and Behavior

The frequencies of two allele’s p and q for a gene locus in a population at Hardy-Weinberg equilibrium are 0.6 and 0.4, respectively. After a few generations of inbreeding, the heterozygote frequency was found to be 0.10, The inbreeding coefficient in this case is

#Question id: 693

#Unit 1. Molecules and their Interaction Relevant to Biology

In an alpha helix, the R groups on the amino acid residues:

#Question id: 21249

#Unit 7. System Physiology – Animal

#Question id: 3824

#Unit 3. Fundamental Processes

State whether the following statements is true/false regarding DNA replication.

1. The polymerization of DNA is essentially irreversible due to the hydrolysis of pyrophosphate.

2. On average about twenty errors are made during each replication of the human genome.

3. DNA polymerase I possesses 5ʹ → 3ʹ exonuclease activity.

4. All DNA ligase enzymes use ATP as a cosubstrate.

5. The purpose of SSB is to prevent single-stranded DNA from folding back on itself to form double-helical regions.