Florida National University Eukaryotic Chromosomes Multiple Choice

0.4 PointsFor each animal cell that begins oogenesis, the number of ova produced is four.__________________

1. True
2. False

0.4 PointsWhat color does chlorophyll reflect?

1. green
2. yellow
3. red
4. violet
5. blue

0.4 PointsEukaryotic chromosomes are composed of:

1. chromatin.
2. circular chromatin.
3. DNA only.
4. proteins only.
5. karyotypes.

0.4 PointsPlant hormones known as ____ stimulate mitosis.

1. growth factors
2. cytokinins
3. cohesins
4. scaffolding proteins
5. cyclins

0.4 PointsTo prevent disastrous consequences, the eukaryotic cell cycle is controlled by:

1. environmental signals.
2. a series of cell cycle checkpoints.
3. a very detailed, rigid genetic program.
4. the mitochondria.
5. replication.

0.4 PointsAn enzyme raises the activation energy of the reaction it catalyzes.__________________

1. True
2. False

0.4 PointsSome enzymes have a receptor site that is other than the active site. This is also referred to as a(n) ____ site.

1. competitive
2. allosteric
3. inhibitive
4. sensitive
5. reversible

0.4 PointsThe cell maintains a ratio of ATP to ADP that is at the equilibrium point.__________________

1. True
2. False

0.4 PointsNucleosomes are best described as:

1. prokaryotic DNA associated with nonhistone proteins.
2. eukaryotic DNA associated with nonhistone proteins.
3. eukaryotic DNA associated with scaffolding proteins.
4. prokaryotic DNA associated with histone proteins.
5. eukaryotic DNA associated with histone proteins.

0.4 PointsIn what part of a chloroplast are chlorophyll and accessory photosynthetic pigments associated?

1. light reaction centers of the stroma lamellae
2. mesophyll membranes
3. stroma grana
4. thylakoid membranes
5. stroma

0.4 PointsA(n) closed system does not exchange energy with its surroundings.__________________

1. True
2. False

0.4 PointsWhy are enzymes considered important biological catalysts?

1. Enzymes decrease the enthalpy of a biochemical reaction.
2. Enzymes lower the activation energy of a biochemical reaction.
3. Enzymes lower the entropy of a biochemical reaction.
4. Enzymes increase the free energy of a biochemical reaction.
5. Enzymes supply the energy to initiate a biochemical reaction.

0.4 PointsThe direction of an exergonic reaction can best be describe as moving:

1. from higher to lower free energy.
2. from higher to lower absolute temperature.
3. from lower to higher free energy.
4. from lower to higher absolute temperature.
5. from higher to lower entropy.

0.4 PointsDuring prophase, ____ is(are) compacted into visible chromosomes.

1. centrioles
2. chromatin
3. kinetochores
4. tetrads
5. centromeres

0.4 PointsCyclic electron transport is different from noncyclic electron transport in that cyclic electron transport produces NADPH.__________________

1. True
2. False

0.4 PointsSurrounding the grana is the thylakoid lumen.__________________

1. True
2. False

0.4 PointsIn fungi and protists, gametes produced by ____ of haploid cells fuse to form a ____ zygote, which then undergoes ____ to restore the haploid chromosome number.

1. mitosis, diploid, meiosis
2. meiosis, haploid, mitosis
3. meiosis, diploid, mitosis
4. mitosis, diploid, mitosis
5. mitosis, haploid, meiosis

0.4 PointsA cell is dividing by binary fission. What can you conclude?

1. The cell is prokaryotic.
2. The cell cycle is out of control.
3. Mitosis has taken place without cytokinesis.
4. The cyclin-Cdk complex is no longer phosphorylating enzymes.
5. Homologous chromosomes have already paired.

0.4 PointsAn enzyme binds its substrate at the active site.__________________

1. True
2. False

0.4 Points____ organized on chromosomes carry the information that controls the functions of the cell.

1. Asters
2. Genes
3. Proteins
4. Nucleosomes
5. Histones

0.4 PointsDuplicated centrioles move to opposite poles of a dividing ____ cell during the ____ of the cell cycle.

1. animal; interphase
2. animal; prophase
3. plant; anaphase
4. prokaryotic; metaphase
5. plant; metaphase

0.4 PointsChemical energy is a form of kinetic energy.__________________

1. True
2. False

0.4 PointsAccording to the second law of thermodynamics, energy cannot be created nor destroyed.__________________

1. True
2. False

0.4 PointsEnergy that is useable and organized is classified as having ____.

1. high energy
2. low entropy
3. low energy
4. low enthalpy
5. high entropy

0.4 PointsThe nuclear envelope fragments during the prometaphase stage.__________________

1. True
2. False