Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Biology
Chapter 11 Test
| Question | Answer |
|---|---|
| If a cubical cell with 2-cm sides doubles the dimensions of its sides, what change occurs to the ratio of its surface area to volume? a. the ratio is halved b. the ratio is doubled c. the ratio is quadrupled d. the ratio is quartered | a. the ratio is halved |
| If the side of a cubical cell doubled, what would the cell then require? select all the correct answers. a. eight times more nutrients b. to excrete eight times more waste c. four times more nutrients d. to excrete four times more waste | a, b |
| What useful purpose is served by cell division in a multicellular organism? select all the correct answers. a. to ensure that a cell does not become too large b. to produce new cells during organism's growth c. to replace damaged cells and tissues | a,b,c |
| Bacteria reproduce ______ through cell fission. However, in another process, a tube of cytoplasm can temporarily connect two bacterial cells, Some DNA passes through this tube. Like _____ reproduction, this process causes genetic variation. | asexually, sexual |
| Which provides the best evidence that Paramecium reproduce asexually? the cells in the colony... a. are genetically different from one another b. decreases in number after day 14 c. are genetically identical d. become smaller over time | c |
| If an organism is successful in a particular environment, ____ reproduction is _____. However, if an environment changes, some offspring of ____ may have a chance of survival and reproductive success than others in a population because of ______. | asexually, advantageous, sexual, genetic variability |
| ESC, IPS cells, Both 1 are made from the inner cell mass of the blastocyst 2 can possibly be used for therapeutic treatments 3 are made from mouse fibroblasts 4 heart, brain, and other differentiated cells can grow form them 5 made form adult cells | Embryonic Stem Cells- 1 IPS Cells- 3,5 Both - 2.4 |
| Before sc therapies can be ethically approved for other conditions, which safety assessments should be confirmed? stem cells a. sn have harmful mutations b. sn spread beyond the site of the transplant c. t/m sn cause tumors d. t/m sn overrun costs | a. stem cells should not have harmful mutations b. stem cells should not spread beyond the site of the transplant c. stem cell treatment should not cause tumors |
| What structure is found in p cells but not eukaryotic cells? a. a shorter, condensed chromosome in the nucleus b. a cs that contains many histones c. a cs found within a membrane-bound nucleus d. a single, circular DNA cs found in the cytoplasm | d. a single, circular DNA chromosome found in the cytoplasm |
| The ______ is the point of attachment for for sister chromatids. | centromere |
| The ___________ is an area from which the spindle fibers extend. | centrosome |
| The __________ consists of coiled and condensed chromatin. | chromosome |
| List in order the phases of mitosis | prophase, metaphase, anaphase, telophase |
| chromatin forms visible chromosomes; spindles form | prophase |
| chromosomes move to the equator of the spindle; centromeres of duplicated chromosomes are aligned | metaphase |
| centromere split and chromatids are pulled to opposite poles of the cell; each pole receives the same number and kinds of chromosomes are the parent cell | anaphase |
| daughter cells are formed; nuclear envelopes reappear and chromosomes become chromatin | telophase |
| Many eukaryotic cells can be grown in tissue culture in the laboratory. Suppose you have two tissue cultures, one in G1 phase and one in the S phase. How would you determine which culture was in the G1 and which was in the S? | growth and synthesis of proteins and other macromolecules as well as an increase in organelles, which would show a culture in G1. Replication of DNA would indicate S phase. |
| The p53 protein is involved in DNA repair and in triggering cell death when repair is not possible. Why are some cancers associated with defective p53 genes? a. because in cells with damaged DNA, P53 protein levels rise and cause apoptosis | b. because cells with damaged DNA are not triggered to die c. because cell growth and division is no longer regulated by p53 protein d. because cells with damaged DNA grow and divide uncontrollably |
| Which of the following happens when cancer occurs? a. the control of the cell cycle is impaired b. cells cannot pass the G1 checkpoint c. apoptosis or programmed cell death takes place d. the cells can no longer enter the cell cycle | a |
| Which of the following statements are typical for cancer cells? a. they tend to be unspecialized b. they undergo apoptosis c. they may form tumors that metastasize d. they have defective genes | a, c, d |
| organelles and materials needed for DNA synthesis are made | G1 |
| at the end of the phase, each chromosome is made up of two chromatids | S |
| proteins and other materials needed for cell division are synthesized | G2 |
| chromatids are distributed to the two daughter nuclei | M |
| this process causes the death of abnormal cells, this process decreases the number of body cells; this process regulates the cell cycle | apoptosis |
| the process produces specialized cells, this process increases the number of body cells, this process repairs injuries | cell division |
| the cells have an abnormal nucleus; the cells undergo metastasis; they are non-differentiated cells | cancer cell |
| the cells have a normal nucleus; cells with DNA damage undergo apoptosis; the cells are differentiated and specialized | normal cell |
| Study the diagram of an experiment to grow a normal plant from isolated cells from a leaf. Describe and explain how a single plant cell can grow into a new multicellular plant. | Certain leaf cells are pluripotent. All of these cells have the same genes, but gene activation differs among types of cells which is crucial for the growth and development of the new multicellular plant. |
| a. differentiation is the process when cells become specialized b. the outer cells of the bc become the embryo c. the inner mass of cells of the bc will form the specialized cells in the body d. specialized bc cells become stem cells in the adult | a, c |
| Compare and contrast the length of time each cell takes to complete each phase of the cycle. Why do some cells divide faster than others and some cells do not divide after they are formed? Into which group does cancer fit, and why? Justify your answer. | cell 1= rarely cell 2=rapidly Cells that divide rapidly are skin cells and ones that take longer are nerve cells. Cancer cells divide rapidly without proper control or regulation therefore they would belong to group 2. |
| G1,S,G2,M The cell nucleus and the cytoplasm divide among two new cells DNA is synthesized, and single-stranded chromatids become double-stranded 'Cells grow at a rate that' varies between the two cell types ' ' is the same in the two cell types | 1. M 2. S 3. G1 4. G2 |
| After 35 hours, which is the most likely observation of the cells? A. Bc have divided into two daughter cells B. Bc are in the S phase of the cc C. Bc are in the M phase of the cc D. Cell 2 has divided twice, while Cell 1 has divided once | d. Cell 2 has divided twice, while Cell 1 has divided once. |
Created by:
dakota_thornell2