Biology Questions
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As cells arrive in the streak node, they change their epithelial-like to a detached flask-shaped cell and ________
When the trophoblast and embryoblast is formed, the structure is called a _________
Some of the hypoblasts cells will form the wall of the _________ that supplies some nutrients prior to establishment of the placenta and provides primitive blood circulation.
At the cephalic end of the primitive streak is the ________
True or False: Hypoblast cells create the body's cells.
At the 64-cell stage, the outer cell mass in the morula begins to transport fluid into the interior forming the _____________ cavity
The embryoblasts cells that are adjacent to the blastocyst cavity become the ______________
Early cell division via cleavage division of the zygote (one cell) results in a ______ cell stage, then ______ cell stage, then ________ cell stage, etc.
All of the body's cells comes from this sublayer of the embryoblast.
True or False: No cells from the trophoblast contribute to the body.
Process of cell division and cellular differentiation of the embryo that occurs during the early stage of development from a one-cell zygote
During the forming of the blastocyte cavity, what happens to the inner cell mass?
out of bacteria, archaea, and eukarya which are most closely related
Male deer (bucks) in a population are reaching sexual maturity with smaller antlers than they did in the past because antler growth rate has decreased. One hypothesis is that this change is related to hunting, because bucks with larger antlers are most prized and therefore taken by hunters more often than bucks with smaller antlers. Which statement best explains the decreased antler size of the buck population?
Is fitness favored to survival or to reproduction?
What are the sources of variation that makes members of the same species different from each other?
1. population is large.2. population is isolated.3. mutation does not alter gene pool.4. mating is random.5. individuals are equal in reproductive success.
A chef sprays antimicrobial cleaner on a counter top. At first, the bacteria population declines significantly. However, even though the chef continues to spray in following weeks, the number of bacteria begins to increase again. Why did this happen?
1. fossil and fossil records2. biogeography3. comparative anatomy4. comparative embryology5. molecular biology
1. produce more offspring than the environment can support2. vary in many characteristics that can be inherited