My Lab#2 Hmwk

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During ________, the shortest phase of mitosis, chromosomes are pulled toward the poles of the cell.

anaphase

This tissue type is a covering and lining tissue. It includes glands.

epithelial

This accessory organ of the skin is composed primarily of dead, keratinized cells.

hair

Which layer is highlighted?

hypodermis

Which structure is highlighted?

reticular layer of dermis

These glands are found all over the skin except in the palms of the hands and soles of the feet. They produce an oily substance that lubricates skin and hair.

sebaceous glands

What is secreted by the highlighted structure?

sebum

Only one human cell has a flagellum. This specialization allows the cell to propel itself forward. It is a ________.

sperm cell

From deep to superficial, the layers of the epidermis of thin skin are ________.

stratum basale, stratum spinosum, stratum granulosum, stratum corneum

During which stage of mitosis does cytokinesis end?

telophase

Identify the stage of mitosis.

telophase

During which phase of mitosis do sister chromatids line up at the center of the cell?

Metaphase Spindle microtubules from both poles of the cell attach to the sister chromatids and pull them in both directions. During metaphase, the sister chromatids are forced to the center of the cell.

During which phase of mitosis do nuclear envelopes and the nucleoli reappear?

Telophase Telophase begins when the chromosomes stop moving. Nuclear envelopes form, and nucleoli reappear. Ultimately, the cell divides in two by a process known as cytokinesis.

A dialysis sac that is permeable to glucose and water is filled with water and placed in a beaker containing 20% glucose solution. Will there be a net transport of glucose across the dialysis sac? If so, in which direction will the glucose move, into the sac or out of the sac?

Yes, glucose will move into the sac.

Which structures would you expect to find in the highlighted layer?

blood vessels, free nerve ending, and receptor cells

What is produced by the highlighted structures?

sweat

These molecules diffuse through the lipid portion of the plasma membrane.

CO2 and O2

What is the name of the process by which the cytoplasm divides in two?

Cytokinesis

The nucleus of the cell contains its genes, which are sections of ________.

DNA

What is true about the blood supply to the skin?

Epidermis is avascular and dermis is richly vascularized.

During which phase of the cell cycle does DNA duplication, or replication, take place?

Interphase DNA replicates during interphase. This process provides each new daughter cell with a full complement of genetic material.

Which statement about vesicular transport is true?

Pinocytosis is used to take liquids into a cell.

During which phase of mitosis do the nuclear envelope and nucleoli disappear?

Prophase Prophase is the first phase of mitosis. During this phase, the sister chromatids condense, the nuclear envelope and nucleoli disappear, and the spindle apparatus forms.

What is not true of epithelial cells?

They are richly vascularized. These are True: They are bound together to form sheets. They have a free surface. They regenerate readily.

The force that causes water and solutes to cross cell membranes by filtration is ________.

a hydrostatic pressure gradient

Identify the stage of mitosis.

anaphase

Cutaneous glands, hair, and nails ________.

are accessory structures of the skin, are derived from stratum basale in the epidermis, and reside in the dermis

Squamous epithelial cells ________.

are thin and flat, like fish scales

Which structure is highlighted?

arrector pili muscle

This organelle is particularly important during cell division. It directs the formation of the mitotic spindle.

centriole

When a double helix of DNA is replicated, two complete helices are formed. Together, these helices are called sister __________.

chromatids Each new daughter cell receives one of the sister chromatids. After the chromatids separate, each is considered a new chromosome. At the end of cell division, each new cell contains 23 pairs of chromosomes.

The outermost surface of the hair is called the __.

cuticle

The nucleus, plasma membrane and ________ are the three major regions of cells that can readily be seen with a light microscope.

cytoplasm

This connective tissue is packed with parallel collagen fibers, attaches muscles to bone, and can withstand great stress when pulled in one direction.

dense regular

Pressure receptors, called Pacinian corpuscles, are located in this layer of the integument.

dermal reticular layer

This region of the skin contains abundant elastic and collagen fibers.

dermis

Two important passive processes for membrane transport are ________.

diffusion and filtration

Common functions of cells include ________.

digesting nutrients and disposing of wastes

Which structure is highlighted?

duct of sudoriferous gland

Bone and cartilage are connective tissues that have ________.

ground substance that is firm or hard

Which structure is highlighted?

hair follicle

Which structure is highlighted?

hair root

This organelle digest other worn-out organelles and foreign substances that have entered the cell.

lysosome

Identify the stage of mitosis.

metaphase

Simple epithelia have ________.

one type of epithelial cell, arranged in a single layer

This layer of the dermis is responsible for fingerprints.

papillary layer

Membrane transport may be passive or active. Select the active process from the list below.

phagocytosis passive tranports are diffusion, filtration, osmosis

Identify the stage of mitosis.

prophase

This layer of the epidermis contains translucent cells filled with keratin fibrils. It is found only in thick skin.

stratum lucidum

Which layer is highlighted?

stratum spinosum

During which phase of mitosis do the sister chromatids move apart?

Anaphase During anaphase, the centromeres split and the spindle microtubules pull the sister chromatids to opposite poles of the cell. The single chromatids are now considered chromosomes.


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