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Exam 1: Development and Structure of Cells and Tissues

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Question 1

Multiple Choice

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Which phase of the cell cycle is characterized as the initial resting stage?

A) S phase
B) G1 phase
C) G2 phase
D) Prophase

E) A) and B)
F) B) and D)

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B

Question 2

Multiple Choice

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Each tissue originates from mesoderm,except one.What is the exception?

A) Bone
B) Liver
C) Blood
D) Muscle

E) A) and B)
F) A) and C)

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Question 3

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___________ __________appear in the third prenatal week as the first sign of shape change in the embryo's body.

Blood cells begin to form in the __________ __________ at weeks of development.

Melanocytes are responsible for skin pigment.

Intercalated disks are present in which type of muscle?

The foramen ovale closes during the third week of prenatal life.

Spindles present during mitosis are attached to centromeres.

The embryonic skeleton first forms as bone.

The ovum contains twice as many chromosomes as its parent cell.

Myotome produces ___________ tissue.

Mitochondria produce which chemical for intracellular energy?

Tissues are most susceptible to teratogens during the proliferative period.

Smooth muscle is consciously controlled.

Which chemical is called the second messenger?

Endoderm and ectoderm are the first two germ layers to develop.

___________bone formation occurs directly through a tight matrix of collagen fibers,which slowly calcify into bone.

Which organelle produces microtubules?

Before the development of the vascular system,the vitelline system provides nutrients to the embryo.

Posttranslational modifications to proteins produced by the rough endoplasmic reticulum are accomplished by __________.