Which statement about stem cells is false? A. Stem cells were first identified in the hematopoietic system. OB.Stem cells in organs can only differentiate into the tissue in which they are located. C. Stem cells are a subpopulation of less differentiated, self-renewing cells present in most adult tissues. D. Stem cells divide to form one daughter cell that remains a stem cell and a second cell that proliferates and then differentigtes.

Q: Which gene program is described correctly? A. Cell division is the process whereby identical cells…

A: Which gene program is described correctly?

Q: List and briefly describe the four stages that are thoughtto have led to the formation of the first…

A: The origin of cells was the very first stage in the evolutionary theory of life on Earth. The cell…

Q: These genes are involved in normal cell growth and division, but if mutated, could become more…

A: Oncogenes are tumour-causing genes. They are mutated and abnormal that leading to uncontrolled cell…

Q: Research the function of the protein called p53. What does this function do? Explain how it can…

A: Step 1 The p53 gene was identified by Arnold Levine, David Lane and William Old in 1979. The p53…

Q: Explain what stem cells are and how they are helpful in an organism

A: Stem cells are the cells that give rise to all other cells in the body and play specific functions.…

Q: A experiment in which cancer cells were injected into the vein leading to the liver demonstrated:…

A: Cancer that spreads from where it started to a distant part of the body is called metastatic cancer

Q: If you draw on your skin with a permanent marker, the markings willfade in a couple of days. What…

A: Skin is the main part of the body that protects and shields the body from any extremities outside.…

Q: can a stem cell become a nerve cell

A: Stem cells are the cells which has the ability to develop into any cell type. Bone marrow is the…

Q: Which molecule is a Cdk inhibitor that is controlled by p53? a. cyclin b. anti-kinase c. Rb d. p21

A: Enzymes that catalyze consecutive metabolic reactions are multifunctional enzymes. These enzymes…

Q: Based on today’s science and medicine, when does the age of viability begin? a. between 8 and 12…

A: The viability of a fetus indicates that the fetus has a survival chance. As soon as the fetus…

Q: When an invasive cancer occurs? A. When genetic mutation occurs in a cell B. Cells are abnormal…

A: * Invasive cancer means a cancer which was grown past the original tissue where it developed and…

Q: when does DNA synthesis occur?  a.

A: The cell cycle consists of several phases: G1 (Gap 1), S (Synthesis), G2 (Gap 2), and M…

Q: How are stem cells shielded from the contents of the small intestine? a. By their tissue…

A: Intestinal stem cells are found in the crypts of the instentine. They have the ability to divide and…

Q: How do Cyclins work? a. They are kinases that phosphorylate key proteins at different points in the…

A: Cell cycle progression is dependent on the activity of cyclin-CDK complexes. Cyclins are the…

Q: How many copies of each gene are found in a cell during prophase II?  A. one copy of each gene B.…

A: Meiosis or meiotic division is one of the two types of cell division found in living organisms. This…

Q: A chromosomal mutation that occurs during meiosis may or may not be expressed in an organism’s…

A: The mitosis cell division is a process by which a diploid (2n) mother cell divides and produce two…

Q: marrow is the spongy, fatty tissue inside your bones. A bone marrow transplant is a medical…

A: A bone marrow transplant is a medical procedure performed to replace bone marrow that has been…

Q: Which of the following embryonic cell movements involves the desperation of cells from a continuous…

A: Gastrulation is the process where blastula implanted forms three germ layers, after week 3 of…

Q: Which statement describes pathology as a concern in cell biology?

A: Option (C) is right answer. All the other options were wrong according to the question because they…

Q: In which marked area below are cells dividing most frequently? OD A C B A B C

A: The above image is of skin.  The skin is mainly divided into two layers - the outermost epidermis…

Q: Which of these is a result of homeostasis?a. Muscular tissue is specialized to contract.b. Normal…

A: Hypothalamus is the part of the brain which is located below the thalamus and above the pituitary…

Q: What would be the likely result of a mutation of the bcl-2 gene on the level of apoptosis? a. No…

A: Answer: Introduction: Bcl-2 (B-cell lymphoma 2), occurred in humans produced by the BCL2 gene, this…

Q: Which protein organizes the cytoskeletons of cells along the medial-lateral axis during convergent…

A: Convergent extension is a mechanism for elongating tissues of an embryo. It consists of 2 steps-…

Q: Which of these processes is MOST directly involved in the resorption of a tadpole’s tail during…

A: The process of resorption of tale in tadpoles is one of the most physiologically notable processes…

Q: What is the first thing that happens when a healthy cell detects damage to DNA? A. It stops the…

A: correct answer = A) It stops the cell cycle Cell cycle proceed only when cell is in good condition…

Q: Cells function for the body's homeostasis . What is the most striking characteristic of cells?…

A: The branch of science which deals with the study of cells is known as cytology. Cytology…

Q: Stem cells are undifferentiated cells with potential to give rise to many types of specialized…

A: Stem cells act as the repair system in a body. There are two kinds of stem cells : embryonic stem…

Q: Which statement is NOT TRUE about lysosomes? a. It contains strong digestive enzymes. b. It is a…

A: a) Lysosomes are membrane-bound organelle which has strong hydrolytic enzymes inside them. These are…

Q: A doctor is using a camera to gulde Instruments into blood vessels. What should the doctor expect to…

A: Closed circulatory system is a type of circulatory system in which blood flows inside the blood…

Q: What do mural cells do? a. Provide the endothelial tubes with structural stability and ability to…

A: ▪︎Mural cells control blood vessel constriction and dilation by regulating blood vessel diameter .…

Q: What happens to microtubules in the presence of very high levels of GTP?   A. They will undergo…

A: In eukaryotic cells three types of cytoskelton proteins are found that are- microfilament,…

Q: If you run IHC and the antibody you chose binds to everything in a non-specific manner, what visual…

A: Immunohistochemistry (IHC) could be a commonly utilized strategy in science and medication to see…

Q: Which protein is a positive regulator that phosphorylates other proteins when activated? a. p53 b.…

A: Answer: Introduction: Cyclin-dependent kinases (CDKs) are the group of protein kinases, it functions…

Q: When pluripotent stem cells differentiate AND self-renew how many specialized cells can be produced…

A: Stem cell A cell that has the ability to continously divide and differentiate(develop) into various…

Q: Which of these occurs as we get older?a. Neurons replicate to replace lost neurons.b. Skeletal…

A: Aging is considered as the progressive physiological changes in an organism that lead to senescence,…

Q: Which of the following is a key feature of stem cells?a. They have the ability to divide.b. They…

A: Stem cells are the earliest type of the cell in cell lineage in multicellular organism. They are…

Tissue renewal

In multicellular organisms, tissue is a level of structure that consists of a group of physically and functionally identical cells and their intercellular substances. Unicellular organisms do not have tissues. Tissues are absent or poorly differentiated even in the simplest multicellular animals, such as sponges. However, more evolved multicellular animals and plants have specialized tissues that may organize and govern an organism's reaction to its surroundings. The word tissue is derived from the Latin word 'weave.' Plants and animals have various kinds of tissue systems that differ in their work and composition according to the different requirements.