Why are mitochondria absent in RBCs (red blood cells)?      2. Why are the mitochondria known as semi‐autonomous organelles?

5       Item 5 One example of a membrane-bound organelle is a ribosome. Group startsTrue or False   6       Item 6 Peroxisomes are membrane-bound organelles. Group startsTrue or False         Item7       Item 7 Which of the following choices describes three general functions cells must perform? Multiple Choice   a. Maintain shape, obtain nutrients, and dispose of wastes   b. Respond to all hormones, maintain a waterproof barrier, give rise to gametes   c. Grow until dividing, store complex carbohydrates, generate antibodies   d.Take up oxygen, prevent water entry, undergo mitosis frequently

Please complete the following question.

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Item17       Item 17 Which is a passive transport process? Multiple Choice   Phagocytosis   Pinocytosis   Receptor-mediated endocytosis   Osmosis   Ion pump Item18       Item 18 The type of vesicular transport by which large molecules or large amounts of substances are secreted from a cell is _________. Fill in the blank Fill in the blank   Item19       Item 19 Materials tend to move less rapidly when their concentrations are significantly different between two compartments. Group startsTrue or False   Item19       Item20       Item 20   As potassium diffuses down its concentration gradient, it moves out of the cell. However, this movement is resisted by the accumulating negative charge outside the cell.   Group startsTrue or False

1. Term describing the leukocyte's CAM-dependent  migration from the blood vessel out to the tissue. 2. Name the two types of structures that mediate cell-cell contact and are associated with intermediate filaments. 3. The dynamic behavior of microtubules is regulated by a variety of MAPs. What does this stand for?

3. Red blood cells, which carry oxygen to body tissues, live for only about 120 days. Replacement cells are produced by cell division in bone marrow. How many cell divisions must occur each second in your bone marrow just to replace red blood cells? Here is the information to use in calculating your answer: There are about 5 million red blood cells per cubic millimetre (mm3) of blood. An average adult has about 5 L (5,000 cm3) of blood. (Hint: What is the total number of red blood cells in the body? What fraction of them must be replaced each day if all are replaced in 120 days?)

A, B & C

I need help on this part of the study guide, to answer the questions about. Identify the organelles of a human cell and describe basic function, and the questions under describe the cell cycle and mitosis.

Disorder 3 is associated with the..... Group of answer choices lysosome mitochondria peroxisome Golgi apparatus