1) Some of the biological steps in human embryo development iare shown below. Ar
ID: 65575 • Letter: 1
Question
1) Some of the biological steps in human embryo development iare shown below. Arrange them in the order in which they occur during normal development. 1 = first and 5 = last.
answer chosse the number for each one from 1 to 5
a) blastocyst implants in wall
b) fertilization
c) gastrulation
d) sperm swims toward the egg
e) embryo disk makes three germ layers
2)The Sonic Hedgehog signaling pathway is important for the growth and development of limbs, hands and fingers in the human fetus. The opposable thumb in humans results from
Select one:
a) a concentration gradient of Sonic hedgehog proteins between the pinky finger and the thumb in the developing hand of the fetus.
b) the expression of a special Sonic hedgehog protein in the thumb cells is not expressed in the pinky cells during development of the fetal hand.
c) the complete absence of Sonic hedgehog proteins in the middle finger and the pinky finger compared to the palm and the thumb of the developing hand of the fetus.
d) genetic programming unrelated to Sonic Hedgehog.
e) the expression of a special Sonic hedgehog protein in the pinky finger cells that is not expressed in the thumb cells during development of the fetal hand.
3) Arrange the following according to the hierarchy of developmental potential. Cells with the highest developmental potential should be numbered 1 and cells with the lowest developmental potential should be numbered 4.
answer chosse the number for each one from 1 to 4
a) totipotent
b) multipotent
c) pluripotent
d) terminally differentiated
Select one:
a) both the endoderm and the mesoderm.
b) the mesoderm.
c) the endoderm.
d) the ectoderm
e) both the ectoderm and the mesoderm.
5)
During development, embryonic stem cells pass along the same genes and genome to the specialized cells generated from the stem cells. Specialized cells can have very different structures and functions because differentiation involves
Select one:
a) the selective deletion (removal) of certain DNA genes from the genome in each type of cell in the body.
b) a step where all genes are copied into RNAs and different RNA splicing reactions occur on a large scale to select the genes to be expressed.
c) the selective expression of different genes in each specialized type of cell or tissue in the body.
d) accretion of more specialized cells from maternal tissues.
e) the DNA replication of localized regions of the genome designed to increase the copy number of certain genes in each type of cell in the body.
answer chosse the number for each one from 1 to 5
a) blastocyst implants in wall
b) fertilization
c) gastrulation
d) sperm swims toward the egg
e) embryo disk makes three germ layers
Explanation / Answer
1. d,b,a,c,e
2. d
3. a,c,b,d
4.e
5. c
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