Florida National University Stage of Meiosis and Hydrolases Catalyze Questions

0.4 PointsAs you climb a flight of stairs, what type of energy are your legs in motion using?

1. kinetic energy
2. thermal energy
3. electrical energy
4. chemical energy
5. potential energy

0.4 PointsBecause enzymes affect the speed of chemical reactions without being consumed, they are referred to as:

1. transformation proteins.
2. catalysts.
3. cytochromes.
4. activation energy.
5. hydrogen acceptors.

0.4 PointsHomologous chromosomes can be identified and/or characterized by:

1. the different centromere positions in the maternal vs. paternal chromosomes.
2. those chromosomes that do not have partners.
3. maternal chromosomes only.
4. their similar and characteristic staining patterns.
5. paternal chromosomes only.

0.4 PointsHow are chlorophyll molecules attached to thylakoid membranes?

1. by a long hydrocarbon side chain
2. by a hydroxide group
3. with a methyl group
4. by a magnesium ion
5. with a porphyrin ring

0.4 PointsDuring which stage of meiosis do the sister chromatids separate?

1. metaphase II
2. telophase II
3. anaphase I
4. metaphase I
5. anaphase II

0.4 PointsIn the cell cycle, DNA is replicated during the G2 phase.__________________

1. True
2. False

0.4 PointsThe M phase of the cell cycle involves two main processes:

1. meiosis I and meiosis II.
2. homologous pairing and crossing over.
3. interphase and mitosis.
4. mitosis and meiosis.
5. mitosis and cytokinesis.

0.4 PointsWhat do hydrolases catalyze?

1. the transfer of a phosphate group
2. splitting water
3. splitting a molecule using water
4. oxidation-reduction reactions
5. reactions in which double bonds are formed

0.4 PointsAccording to the second law of thermodynamics, the amount of usable energy availableto do work in the universe ____ over time.

1. exponentially increases
2. crashes
3. stays constant
4. increases
5. decreases

0.4 PointsCytokinesis in animal cells involves contraction of a ring of ____ microfilaments.

1. actin plus myosin
2. tubulin plus actin
3. cohesin plus actin
4. cyclin plus myosin
5. cyclin plus actin

0.4 PointsA nucleosome consists of DNA wrapped around scaffolding proteins.__________________

1. True
2. False

0.4 PointsA cell in the G2 phase:

1. has twice the amount of DNA present in a telophase nucleus.
2. lacks a visible nuclear membrane.
3. is in mitosis.
4. is in cytokinesis.
5. has visibly distinct chromosomes.

0.4 PointsWhat is the ultimate source of energy for almost all living organisms?:

1. the sun
2. lipids
3. heat
4. glucose
5. carbon dioxide

0.4 PointsIn which part of the chloroplast do the carbon fixation reactions take place?

1. stroma
2. mesophyll
3. granum
4. thylakoids
5. lumen

0.4 PointsThe ____ is responsible for the separation of the chromosomes during the ____ of mitosis.

1. kinetochore; prophase
2. centromere; telophase
3. mitotic spindle; interphase
4. mitotic spindle; anaphase
5. cell wall; anaphase

0.4 PointsThe function of nucleosomes is to:

1. prevent histones from tangling.
2. prevent DNA strands from tangling.
3. help DNA replicate.
4. prevent RNA from tangling with DNA during transcription.
5. make RNA synthesis possible.

0.4 PointsWhat would happen if you were to increase the temperature in an enzyme-catalyzed reaction?

1. The rate of reaction will decrease and then increase rapidly.
2. The rate of reaction will increase and then decrease rapidly.
3. The rate of reaction will increase and then level off.
4. The rate of reaction will not change.
5. The rate of reaction will decrease and then level off.

0.4 PointsScientists usually name enzymes by adding what suffix to the name of the substrate with which the enzyme is associated?

1. -ase
2. -yst
3. -ator
4. -tic
5. -lose

0.4 PointsEukaryotic chromosomes consist of:

1. linear DNA molecules complexed with positively charged histone proteins.
2. circular DNA molecules complexed with positively charged nonhistone proteins.
3. linear DNA molecules complexed with negatively charged histone proteins.
4. circular DNA molecules complexed with negatively charged histone proteins.
5. circular DNA molecules folded to fit inside a bacterial cell.

0.4 PointsA cell must expend energy to produce a concentration gradient.__________________

1. True
2. False

0.4 PointsThe cell cycle of a typical somatic cell consists of the ____ and M phases.

1. mitosis
2. interphase
3. meiosis I
4. crossing-over
5. meiosis II

0.4 PointsWhen is a cell in metaphase?

1. The chromosome are separated into distinct groups at opposite poles of the cell.
2. Cytokinesis is occurring.
3. The chromosomes are visible as threadlike structures.
4. The chromosomes are aligned at the midplane of the cell.
5. The nuclear envelope is clearly visible.

0.4 PointsMany bacterial infections are treated with drugs, such as penicillin and sulpha drugs, that ____ the bacterium’s enzyme activity.

1. accentuate
2. stabilize
3. decrease
4. promote
5. inhibit

0.4 PointsIn a human cell at prophase I, there are ____ tetrads.

1. 23
2. 46
3. 92
4. 2
5. 4

0.4 PointsDuring prophase I, each chiasma represents:

1. the remnant of the nucleolus.
2. the remnants of the nuclear envelope.
3. a newly formed haploid gamete.
4. a site of crossing-over.
5. the site where sister chromatids are connected.