Bio Study Quizzes

The cells show characteristics of tumors

A research team began a study of a cultured cell line. Their preliminary observations showed them that the cell line did not exhibit either density-dependent inhibition or anchorage dependence. What could they conclude right away?

haploid, and the chromosomes are each composed of two chromatids

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

They change their conformation after binding with signal polypeptides.

Because most receptors are membrane proteins, which of the following is usually true?

the complete set of an organism's genes

Which of the following defines a genome?

cAMP

Caffeine is a inhibitor of phosphodiesterase. Therefore, the cells of a person who has recently consumed coffee would have increased levels of

3/16

Drosophila (fruit flies) usually have long wings (+) but mutations in two different genes can result in bent wings (bt) or vestigial wings (vg). If flies that are heterozygous for both the bent wing gene and the vestigial wing gene are mated, what is the probability of offspring with bent wings only?

true

Epistasis is a genetic condition in which certain alleles of one locus alter the expression of alleles of a different locus.

hydrolyzes GTP binding to G protein.

GTPase activity is involved in the regulation of signal transduction because it

True

Homologous chromosomes contain genes for the same traits.

The disorder may be due to mutation in a single protein- coding gene

Hutchinson-Gilford progeria is an exceedingly rare human genetic disorder in which there is very early senility and death, usually from coronary artery disease, at an average age of approximately 13. Patients, who look very old even as children, do not live to reproduce. Which of the following represents the most likely assumption?

environmental factors such as soil pH

Hydrangea plants of the same genotype are planted in a large flower garden. Some of the plants produce blue flowers and others pink flowers. This can be best explained by which of the following?

a form of cancer in which there is insufficient apoptosis

If an adult person has a faculty version of the human analog to ced-4 of the nemtode, which of the following is most likely to result?

The growth factor is a paracrine signal

In an experiment to track the movement of growth factor molecules from secretion to the point of receptor binding in a particular species of mammal, a student found a 20-fold reduction in mm traveled when in the presence of an adrenal hormone. This is in part attributable to which of the following?

Meiosis

In animals, ___ occurs during the production of the egg and the sperm

0

In certain plants, tall is dominant to short. If a heterozygous plant is crossed with a homozygous tall plant, what is the probability that the offspring will be short?

A plant species( privet shrubs) has 46 chromosomes per cell.

In the human species, all somatic cells have 4 chromosomes. Which of the following can be also be true?

The random and independent way in which each pair of homologous chromosomes line up at the metaphase plate during meiosis I.

Independent assortment of chromosomes is a result of

Incomplete Dominance

Radish flowers may be red, purple or white. A cross between a red-flowered pant and a white flowered plant yields all- purple offspring. the part of the radish we eat may be oval or long with long being the dominant characteristic. The flower color trait in radishes is an example of which of the following?

TtRr-tall and pink

Tallness (T) in snapdragons is dominant to dwarfness (t), while red (R) flower color is dominant to white (r). The heterozygous condition results in pink (Rr) flower color. A dwarf, red snapdragon is crossed with a plant homozygous for tallness and white flowers. What are the genotype and phenotype of the F1 individuals?

Incompatibility of the binding of the signal molecule to the receptor

The termination phase of cell signaling requires which of the following?

Exon shuffling

Two eukaryotic proteins have one domain in common but are otherwise very different. Which of the following processes is most likely to have contributed to this similarity?

There should also be persons born with, if not living with, an anti-lepore mutation or duplication.

Unequal crossing over during prophase I can result in one sister chromosome with a deletion and another with a duplication. A mutated form of hemoglobin, known as hemoglobin Lepore, is known in the human population. Hemoglobin Lepore has a deleted set of amino acids. If it was caused by unequal crossing over, what would be an expected consequence?

radioactive-labeled nucleotides

Using which of the following techniques would enable your lab group to distinguish between a cell in G2 and a cell from the same organism in G1?

Calcium ions are actively imported from the cytoplasm into the ER

What explains the increased concentration of Ca++ in the ER?

Finding transcriptional start and stop sites, RNA splice sites and ESTs

What is gene annotation in bioinformatics?

Aster fibers

Which spindle fiber will shorten during anaphase, thereby pulling the chromosomes apart?

Ss

Where two alternatives for a trait are tall and short, and tall is dominant, the genotype of a heterozygous individual would be expressed

serine and threonine

Which of the following amino acids are most frequently by phosphorylated protein kinases in the cytoplasm during signal transduction?

at least 1-2 per chromosome pair

Which of the following best describes the frequency of crossing over in mammals?

sperm cell plus an egg cell

Which of the following cells, when combined, will result in a diploid fertilized egg?

The law of independent assortment requires describing two or more genes relative to one another.

Which of the following differentiates between independent assortment and segregation?

Aerobic Cellular respiration of multicellular organisms

Which of the following is NOT a function of cell division?

GTPase activity and hydrolysis of GTP to GDP

Which of the following is a correct association?

Cdk

Which of the following is a protein maintained at constant levels throughout the cell cycle that requires cyclin to become catalytically active?

Platelet-derived growth factor (PDGF)

Which of the following is released by platelets in the vicinity of an injury?

It would not be able to activate and inactivate the G protein on the cytoplasmic side of the plasma membrane.

Which of the following is true for the signaling system in an animal cell that lacks the ability to produce GTP

During mitosis, the centromeres divide and the sister chromatids stay together.

Which of the following statements about mitosis is NOT correct?

MPF

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

Asters

Which part of a spindle consists of arrays of short microtubules that radiate from the spindle pole?

Sanger

Who first developed the DNA sequencing approach using dideoxynulecoside triphospates in DNA synthesis?

false

a trait caused by a recessive autosomal allele will result in a pedigree that shows affected individuals having at least one affected parent.

telophase II

during ___, daughter cells will form, each containing only one chromosome from each homologous pair.

homologous chromosomes are separated

which of the following happens at the conclusion of meiosis I?

to allow the chromosomes to move without becoming entangled and breaking

why do chromosomes coil during mitosis?