Mutant cells lacking coated pits would most likely be a. deficient in receptor-mediated endocytosis b. unable to adopt to the cold c. unable to actively transport ions out of the cell d.  unable to actively transport ions into the cell e. involved in steroid synthesis

Which of the following is a characteristic of a cell undergoing cellular senescence? a.Doubling in physical size b.Production of SASPs c.Atypically low NGF1-A levels d.Abnormally high rate of proliferation

Red blood cells shrivel when placed in a 10% sucrose solution. When first placed in the solution, the solute concentration of the cell is______ the concentration of the sucrose solution. After the cells shrivel, their solute concentration is______ the concentration of the sucrose solution. A. Greater than... equal to B. Equal to... equal to C. Less than... greater than D. Less than... equal to E. Greater than... less than

A common starvation or generalized stress signal produced and sometimes secreted by bacterial, protistan, or fungal cells is   a. CAP b. cyclic ATP c. cyclic GTP d. cyclic AMP e. cyclic ADP f. glucose g. Lactic acid h. Ethanol or CO2

2. Assuming no contact inhibition and optimal nutrient and waste transport, graph the cell concentration as a function of time (up through 72 hours) for the following conditions: a. μ =0.10 h-¹; Xo = 1 X 100 cells b. to 24 hrs; Xo = 10 cells c. μ= 0.00001 h-¹; No = 1 X 10° cells d. With a basic knowledge of rates of cell turnover and division in various human tissues, what kinds of cells are best described by the graph in a? b? and c?

3.Cell surface receptors used in cell signalling are usually proteins that extend from one sid of the membrane to the other side of the membrane. What is the role of the extracellular part of the protein? A. binding the signalling molecule B. functioning as an enzyme C. increasing the solubility of the receptor D. transmitting the signal from the target cell

46. If a cell does not receive a go ahead signal at the G1 checkpoint in the cell cycie then it will a. proceed On to the "S" phase b. go directly to jail - Do not pass GO. DO nột collect $200 c. proceed to mitosis d. enter a nondividing state called the Go phase 47. When T2 phages infect bacteria and make more viruses in the presence of radioactive phosphorus, what is the result? The bacterial DNA will be radioactive. b. The viral DNA will be radioactive. The bacterial DNA will be radioactive. c. The viral DNA will be radioactive. The viral proteins will be radioactive. d. The viral DNA will be radioactive. The viral proteins will be radioactive. e. 48. Each amino acid attaches to its proper tRNA with the help Of a. DNA b. an enzyme and ATP c. an enzyme d. ATP e. an enzyme and DNA

GABA receptors play an essential role in neurotransmission in the central nervous system. In response to the appropriate signal, these receptors open up and allow CI (chloride ions) to flow into the cell. Given this information, GABA receptors can be classified as a A. gated ion channel B. carrier protein O C. symporter D. enzyme

Match the type of substance with the likely mechanism used to move material across the cell membrane. v steroid A. osmosis v amino acid B. endocytosis v large protein outside the cell C. facilitated diffusion protein hormone to be secreted from cell D.exocytosis oxygen gas E simple diffusion monosaccharide carbon dioxide positive or negative ion_ water