AP BIO CHAPTER 11 - 13 TEST

Cancer can result from a variety of different mutational events. Which of the following is LEAST likely to result in the initiation of a canereous tumor

A defect in a cell-cycle checkpoint prevents a cell from entering the S phase

Within a forest ecosystem, there is a large amount of diversity among members of a warbler species. Of the following stages of meiosis illustrated for a typical cell, which contributes most to diversity among the warblers?

A picture quizlet wont let put in but basically it's independent assortment in metaphase 1

Which of the following is (are) true of ligand-gate ion channels

A) They open and close in response to a chemical signal B) They lead to changes in sodium and calcium concentrations C) They are important in the nervous system

Asexual reproduction and sexual reproduction differ in all but which of the following ways

Asexual reproduction is utilized only by fungi and protists, whereas sexual reproduction is utilized only by plants and animals.

Which of these statements is false

At sexual maturity, ovaries and testes produce diploid gametes by meiosis.

For a newly evolving protist, what would be the advantage of using eukaryote -like cell division rather than binary fission?

Cell division would allow for the orderly and efficient segregation of multiple linear chromosomes.

Which of the following is a protein synthesized at specific times during the cell cycle that associate with a kinase to form a catalytic ally active complex

Cyclin

Which of the following best describes the role of mitosis in the cell cycle

Distributing replicated chromosomes to daughter nuclei

Cells that are in a nondividing state are in which phase?

G0

Which of the following are primarily responsible for cytokinesis in plant cells

Golgi-derived vesicles

Which of the following best represents two different signaling pathways that share a second messenger

It's C but quizlet is stupid and wont let me add pictures

Which of the following triggers the cell's passage past the G2 checkpoint into mitosis

MPF

Imagine looking through a microscope at a squashed onion root tip. The chromosomes of many of the cells are plainly visible. In some cells, replicated chromosomes are aligned along the center (equator) of the cell. These particular cells are in which stage of mitosis?

Metaphase

Which of the following occurs in all species of living organisms and may lose to an increase in genetic variation

Mutations in the genome

From the perspective of the cell receiving the message, the three stages of cell signaling are

Signal reception, signal transduction, and cellular response

Based on the model of eukaryotic cell cycle regulation shown in the figure, which of the following best describes the effect of a drug that bloacks the production of the mitotic cycle

The cell would be prevented from entering mitosis, and the cell would stop dividing

How do the daughter cells at the end of mitosis and cytokinesis compare with their parent cell when it was in G1 of the cell cycle

The daughter cells have half the number of chromosomes and the same amount of DNA

Type 1 diabetes results from the destruction of insulin-producing cells in the pancreas. Individuals with type 1 diabetes produce insufficient amounts of insulin, a hormone that regulates the concentration of glucose in the blood Which of the following best explains how treatment with a drug stimulates the production of insulin receptors on target cell will affect the insulin signaling pathway in an individual with Type 1 diabetes?

The drug will have little to no effect on the signaling pathway because the receptors will not be activated in the absence of insulin

Which of the following statements best describes how a growth factor stimulates cell division from outside a cell

The growth factor binds to receptors on the cell surface, initiating a signal transduction pathway that activates specific target genes

Regarding mitosis and cytokinesis, one difference between higher plants and animals is that in plants

a cell plate begins to form at telophase, whereas in animals a cleavage furrow is initiated at that stage.

Where do the microtubules of the spindle originate during mitosis in both plant and animal cells?

centrosome

The centromere is a region in which

chromatids remain attached to one another until anaphase

After telophase I of meiosis, the chromosomal makeup of each daughter cell is

haploid, and the chromosomes are each composed of two chromatids

A human cell in prophase of mitosis can be distinguished from a human cell in prophase I of meiosis by the presence of

paired homologous chromosomes in the meiotic cell

Which of the following occurs in meiosis but not in mitosis

synapsis of chromosomes

Of the following, a receptor protein in a membrane that recognizes a chemical signal is most similar to

the active site of an allosteric enzyme in the cytoplasm that binds to a specific substrate.

Cytokinesis usually, but not always, follows mitosis. If a cell completed mitosis but not cytokinesis, the result would be a cell with

two nuclei