#Question id: 10511
#Unit 6. System Physiology – Plant
Which type of pumps inhibits digitoxin in the membranes of heart cells, leading to increased myocardial contraction?
#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: 5469
#Unit 8. Inheritance Biology
Breeding experiment was performed on pure lines of tomatoes differing in fruit weight. The plants were all grown in a controlled environment chamber providing equal environmental conditions for all individuals as far as humanly possible. The results were as follows:
a) One dominants polygene contribution?
b) What will be frequency of 20 g in F2 CLASSES?
c) Number of polygene loci for this character.
#Question id: 32254
#Unit 2. Cellular Organization
#Question id: 2668
#Unit 2. Cellular Organization
The toxic shock syndrome toxin is produced by some Salmonella species when there is not sufficient iron present. When iron is present, it prevents transcription of the TSS-toxin gene. Iron therefore serves as __________.