The GM progenitor cell gives rise to two main classes of white blood cells in the
presence of appropriate colony-stimulating factors. Both of these cell types …
A.have relatively long half-lives, being capable of living for months if not years.
B.circulate in the bloodstream for most of their life-span.
C.are phagocytes.
D.are unaffected by colony-stimulating factors once terminally differentiated.
E.All of the above.
Cortical rotation following fertilization in X. laevis places the …(1) pole at the point of
sperm entry, while Wnt11 mRNA is transported to the …(2) pole.
A.1: anterior; 2: posterior
B.1: posterior; 2: anterior
C.1: animal; 2: vegetal
D.1: dorsal; 2: ventral
E.1: ventral; 2: dorsal
In the following schematic diagram showing the initial signaling steps in growth cone
collapse in motor neurons, indicate which protein (A to E) corresponds to the following.
Your answer would be a four-letter string composed of letters A to E only, e.g. CBAE.
( )Ephrin
( )Ephexin
( )RhoA GTPase
( )Cytoplasmic tyrosine kinase
Indicate true (T) and false (F) statements below regarding Hox genes. Your answer
would be a four-letter string composed of letters T and F only, e.g. TTTF.
( )The order of expression of Hox genes along the body corresponds to their order in the
Hox complex.
( )Generally, the more anterior of the Hox genes dominate (or suppress) posterior Hox
genes.
( )When a posterior Hox gene is artificially expressed in an anterior region of the
embryo, the tissue maintains its anterior character.
( )Hox genes control the A-P axis in both vertebrates and invertebrates.
Assume two isolated human communities with 500 individuals in each. If the same
neutral mutation happens at the same time in two individuals, one from each
community, what is the probability that it will be eventually fixed in both of the
populations? How would the result change if the two communities fully interbreed?
Write down the numbers in scientific notation and separate the two answers with a
comma, e.g. 10-5, 3 x 10-2
.