1)From the videos of living embryos that you watched, which of the following des

Question

1)From the videos of living embryos that you watched, which of the following describes the general activities of the embryonic cells that you observed during embryo development? The embryonic cells

Select one:

a) flow in a zigzag fashion betrween the two sides of the embryo.

b) are engaged in random movements.

c) appear to have dynamic, purposeful movements.

d) all act the same way in the embryo.

e) appear to be static (unmoving).

2) Human embryonic stem cells are called "immortal cells" because they can

Select one:

a) continue to grow indefinitely as undifferentiated human embryonic stem cells.

b) differentiate into tissues that can be transplanted in perpetuity.

c) respond to certain signals and differentiate into specialized cells.

d) produce growth factors that prolong the existence of differentiated cells in tissue culture.

e) respond to special signals and convert into mouse stem cells.

3)

Cell differentiation can be triggered by signals received from

Select one or more:

a) the environment

b) a neighboring cell.

c) a distant cell.

d) radio waves from a radio station.

e) inside the cell.

4)

In in vitro fertilization (IVF) the egg and sperm cells are left to find each other in a petri dish. What is the key difference between IVF and the method used in intracytoplasmic sperm injection (ICSI)?

In ICSI the

Select one:

a)intact sperm cell is injected directly into the nucleus of the egg cell.

b) cytoplasm of the egg cell is injected into the sperm cell.

c) intact sperm cells are heat treated to eliminate the most active sperm before injection directly into the egg cytoplasm.

d) nucleus of a sperm cell is injected into the cytoplasm of an egg cell.

5)

Select one:

True

False

)

The image at left is a scanning electron micrograph of sperm attached to an egg cell. This image demonstrates that multiple sperm can fertilize the same egg.

Explanation / Answer

1. a) flow in a zigzag fashion betrween the two sides of the embryo.

2. d) produce growth factors that prolong the existence of differentiated cells in tissue culture.

3. a) the environment

4. d) nucleus of a sperm cell is injected into the cytoplasm of an egg cell.

5. True

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.