Bio Final Exam

What represents the most basic level of biological organization that can carry out all properties of life?

• cell

• atom

• tissue

• molecule

• organism

How does a prokaryotic cell differ from a eukaryotic cell?

• prokaryotic cell has no membrane-enclosed organelles

• prokaryotic has plasma membrane

• prokaryotic contains organelles

• prokaryotic has nucleus

• prokaryotic has DNA

the smallest unit of an element that contains all the characteristics of that element

• molecule

• organelle

• cell

• atom

• none

A major interacting system that includes organisms and their nonliving environment

• biosphere

• ecosystem

• community

• population

• both a and b

Most accurate organization of life

• biosphere, ecosystem, communities, populations, organisms, cells, organelles, atoms

• ecosystems, biosphere, communities, populations, organisms, cells, organeles, atoms

binary fission in prokaryotes does not require the

• replication of dna

• elongation of the cell

• separation of daughter cells by septum formation

• assembly of the nuclear envelope

Chromatin is composed of

• rna and protein

• dna and protein

• sister chromatids

• chromosomes

what is a nucleosome

• a region in the cell's nucleus that contains euchromatin

• a region of the dna wound histone proteins

• a region of a chromosome mad up of multiple loops of chromatin

• a 30 nm fiber foud in chromtin

What is the role of cohesin roteins in cell division

• they organize the dna of the chromosomes into highly condensed structures

• they hold the dna of the sister chromatids together

• they help the cell divide into two daughter cells

• they connect microtubles and chromosomes

the kintochere is a structure that functions to

• connect the centromere to microtubles

• connect centrioles to microtubles

• aid in chromosome condensation

• aid in chromosome cohesin