Chapter 11
Studies of rapidly dividing embryonic animal cells revealed: a cyclic production of certain proteins in sync with the cell cycle. a cyclic activation of protein kinases in sync with the cell cycle. that the production of cyclin proteins is followed by activation of CDK enzymes. All of these choices are correct. that inhibition of protein production blocks mitosis.
All of these choices are correct.
In what way is cytokinesis in plant cells similar to binary fission in a bacterium? A motor protein slides microtubules in a contractile ring at the plasma membrane between the two nuclei to separate the daughter cells. All of these choices are correct. Cell wall material is deposited to separate the daughter cells. A microtubulin-like structure constricts the plasma membrane between the two nuclei to separate the daughter cells. A ring of actin filaments constricts the plasma membrane between the two nuclei to separate the daughter cells
Cell wall material is deposited to separate the daughter cells
Which of the following statements is TRUE if a cell has a mutation in the p53 gene such that the p53 protein is no longer able to be phosphorylated? The kinase activity in the nucleus would decrease in response to DNA damage. The amount of cytoplasmic p53 protein would increase in response to DNA damage. The cell would proceed through the cell cycle even in the presence of DNA damage. The cell would arrest, giving time for the DNA damage to be repaired.
The cell would proceed through the cell cycle even in the presence of DNA damage.
Which of the following statements is NOT true about gamete formation in mammals? Only one of the four cells resulting from meiosis goes on to become an egg, which becomes a zygote upon fertilization by a sperm cell. Only one of the four cells resulting from meiosis goes on to become an oocyte. The polar bodies formed during meiosis in the female can participate in fertilization with sperm. The cytoplasm is diminished during development of sperm, and a flagellum is formed to give sperm locomotion. In the female, the separation of cytoplasm is unequal during meiosis.
The polar bodies formed during meiosis in the female can participate in fertilization with sperm
Sexual reproduction results: in a new generation with the same number of chromosomes as each parent. in offspring that are not genetically identical. in a new generation that is not genetically identical to its parents. All of these choices are correct. from combining genetic material from two gametes.
all of the choices are correct
Which of the following steps in prokaryotic binary fission is CORRECT? All of these choices are correct. The two replicated chromosomes remain attached to the plasma membrane. DNA is replicated bidirectionally from a single point on the circular chromosome. Cell wall material is laid down at the midpoint to separate the two daughter cells. The cell continues to grow outward symmetrically, separating the two chromosomes.
all of the choices are correct
The amount of _____ is fairly constant throughout the cell cycle, but the amount of _____ varies. cyclin-dependent kinase/DNA cyclins/cyclin-dependent kinases cyclins/DNA DNA/cyclins
cyclin-dependent kinase/DNA
Which of the following is NOT true about the eukaryotic cell cycle? Some cells pause between M phase and S phase for more than a year. The M phase consists of two events: mitosis and cytokinesis. Interphase is typically the shortest of the two stages of the cell cycle. There are three phases of interphase: the S phase and two gap phases. There are two stages to the cell cycle: M phase and interphase.
interphase is typically the shortest of the two stages of the cell cycle
Cancer-causing genes found in some viruses are called: proto-oncogenes. oncogenes. viral genes. tumor suppressor genes.
oncogenes
Which of the following has the MOST similarity in nucleotide sequence? sister chromatids homologous chromosomes maternal and paternal copies of the same chromosome complementary strands of DNA nonhomologous chromosomes
sister chromatids
