A sample space has two events A and B such that probabilities  

#Question id: 1214

#Unit 4. Cell Communication and Cell Signaling

A mutation in the FAK gene would likely result in:

#Question id: 298

#Unit 1. Molecules and their Interaction Relevant to Biology

Water molecules contain _____________ hydrogen bond/s.

#Question id: 5664

#Unit 5. Developmental Biology

Following statements are regarding to gamete fusion and the prevention of polyspermy in mammals.

A. In mammals, it is not the tip of the sperm head that makes contact with the egg but the side of the sperm head.

B. The junction between the inner acrosomal membrane and the sperm cell membrane is called the acrosomal region, and this is where membrane fusion between sperm and egg begins.

C. Sperm-egg fusion appears to involve several proteins, two of which are Izumo, in the oocyte membrane, and Juno, in the acrosomal membrane.

D. These fusion proteins bind together and appear to recruit other proteins to make an adhesion and fusion complex.

Which of the following statements are correct?

#Question id: 11099

#Unit 7. System Physiology – Animal

In the mammalian alveoli, the partial pressure of O2 is _______ that of atmospheric air and the CO2 partial pressure is _______ that of atmospheric air

#Question id: 7170

#Unit 5. Developmental Biology

Following statements are regarding to maternally provided mRNAs—hunchback and caudal, are critical for patterning the anterior and posterior regions of the body plan, respectively.

A. These two mRNAs are synthesized by the nurse cells of the ovary and transported to the oocyte, where they are distributed ubiquitously throughout the syncytial blastoderm.

B. Translation of the hunchback and caudal mRNAs is repressed by the diffusion gradients of Bicoid and Nanos proteins, respectively.

C. Bicoid binds to a specific region of caudal’s 3′UTR. Here, it binds Bin3, a protein that stabilizes an inhibitory complex that prevents the binding of the mRNA 5′ cap to the ribosome. By recruiting this translational inhibitor, Bicoid prevents translation of caudal in the anterior of the embryo.

D. Nanos protein prevents translation of the hunchback message. Nanos in the posterior of the embryo forms a complex with several other ubiquitous proteins, including Pumilio and Brat. This complex binds to the 3′UTR of the hunchback message, where it recruits d4EHP and prevents the hunchback message from attaching to ribosomes.

Which of the following statements are true?