Module 1 Flashcards
Which of the following is a trace element in living things?
Chromium
An atom’s valence electron shell
determines its chemical reactivity
A covalent bond occurs when
electrons are shared between two atoms to complete their valence shells
When a sodium atom transfers an electron to a chlorine atom
the ions will separate in the presence of water.
The figure below is depicting the interaction of water molecules with one another. The weak attractions between water molecules are known as
hydrogen bonds
A space-filling model shows formation of different bonds between neighboring red and grey atoms of 5 adjacent molecules.
A(n) ________Blank can be defined as a substance that keeps pH within established limits by taking up excess H+ or OH- in a solution.
buffer
All atoms of the same element have the same
atomic number
An ionic bond forms when
a positively charged ion is attracted to a negatively charged ion.
When a positively charged hydrogen in a water molecule become attracted to the negatively charged oxygen in a nearby water molecule, this is referred to as a(n)
hydrogen bond
The subatomic particles that are found within the nucleus of an atom are the
neutrons and protons
Hydrolysis of maltose, a disaccharide, results in
two monosaccharides.
A triglyceride is formed when three fatty acids join a glycerol by
dehydration synthesis reactions.
Which of the following correctly lists the parts of a nucleotide of RNA?
nitrogen-containing base, ribose, phosphate
A saturated fat has
* one bond
* two bonds
* no double bonds
no double bonds
Which of the following is in correct order from largest to smallest?
polypeptide - dipeptide - amino acid
Select the incorrect association:
1. glucose - monosaccharide
2. cellulose - building block for cell walls in plants
3. sucrose - polysaccharide
4. lactose - a disaccharide
5. starch - a long chain of glucose molecules
sucrose - polysaccharide
The polymer shown below is comprised of what kind of subunits:
* G-C
* T-A
* C-G
* A-T
Think about the double stand helix
nucleotides
Which of the following is an organic molecule?
C5H10O5
Starch is a ________Blank made of many ________Blank.
polymer; glucose molecules
The four main categories of organic macromolecules are
carbohydrates, lipids, proteins, and nucleic acids.
Which of the following is a correct match?
* ribosomes – protein synthesis
* Golgi apparatus - production of cellular ATP
* mitochondria - protein alteration and packaging
* lysosomes – lipid synthesis
* smooth endoplasmic reticulum - storage of water
ribosomes – protein synthesis
Which organelle modifies the contents within vesicles and then repackages them for export?
1. * smooth ER
1. rough ER
1. Golgi apparatus
1. ribosomes
1. 1. plasma membrane
Golgi apparatus
Both plants and animals need mitochondria to
produce ATP
Without gap junctions in certain tissues;
* cells would not be able to communicate with each other.
* fluids may leak out past the barrier the junction would create.
* the tissues would not be able to expand and stretch without damage.
* nutrients would not be able to be passed from cell to cell.
* cells would not be able to migrate during their development.
cells would not be able to communicate with each other.
Which of the following structures would NOT be found in a prokaryotic cell?
* cell membrane
* nucleus
* ribosomes
* flagella
* chromosomes
NUCLEUS
What must materials pass through to enter or leave a cell?
Plasma membrane
What function does the nucleolus have?
synthesizes ribosomal RNA
Which of the following is involved in the breakdown of damaged organelles?
* smooth endoplasmic reticulum
* lysosome
* ribosome
* rough endoplasmic reticulum
* centrosome
Lysosome
Which of the following statements describes the function of a chloroplast?
It converts light energy into chemical energy.
Both the nuclear membrane and the plasma membrane are composed of
phospholipids
Which of the following pairs is correctly matched?
* G1 phase - DNA replication
* G2 phase – cytoplasm divides
* S phase - DNA replication
* M phase - cell growth
* G0 phase – chromosomes line up at the spindle equator
s-phase - DNA replication
Which of the following statements is correct regarding the events of the cell cycle?
* DNA is duplicated during the G1 and G2 phases.
* DNA replicates during cytokinesis.
* The M phase is usually the longest phase of the cell cycle.
* Interphase consists of G1, S, and G2.
* The cell enters a non-dividing state in the G2 phase.
Interphase consists of G1, S, and G2.
Which of the following represents the phases of mitosis in their proper sequence?
* prophase, metaphase, anaphase, telophase
* interphase, prophase, metaphase, telophase
* anaphase, interphase, prophase, metaphase, telophase
* prophase, metaphase, anaphase, telophase, cytokinesis
* metaphase, interphase, cytokinesis, anaphase, telophase
prophase, metaphase, anaphase, telophase
During which phase of mitosis are the sister chromatids separated and consequently become daughter chromosomes?
* anaphase
* interphase
* metaphase
* prophase
* telophase
anaphase
Apoptosis?
can be used to remove damaged or malfunctioning cells.
Cancer occurs when
the regulation of the cell cycle is lost and uncontrolled cell division occurs.
Plant cells and animal cells differ in cytokinesis because
plant cells need to build a cell wall, while animal cells do not.
What structure is formed by two sister chromatids being held together by a centromere?
duplicated chromosomes
Which of the following is mismatched?
* interphase - longest stage of the cell cycle
* S stage - DNA synthesis
* M stage - mitosis and cytokinesis
* G1 stage - cell grows in size and cell organelles increase in number
* G2 stage – mitosis begins
G2 stage – mitosis begins
Which lifestyle choice is responsible for 90% of the cases of lung cancer among men?
smoking
Which of the following statements is correct?
* Meiosis involves two divisions and produces four nonidentical gametes.
* Meiosis involves one division and produces two nonidentical gametes.
* Mitosis involves one division and produces two nonidentical gametes.
* Mitosis involves two divisions and produces four identical gametes.
* Meiosis involves two divisions and produces two identical gametes.
Meiosis involves two divisions and produces four nonidentical gametes.
One major difference between meiosis I and meiosis II is that…
crossing-over occurs in prophase of meiosis I but not in prophase of meiosis II.
Which of the following processes does not contribute to creating genetic variability in the offspring?
* meisois
* mitosis
* anaphase
* prophase
mitosis
A homologous pair is composed of
two chromosomes with two sister chromatids each.
During crossing-over…
* genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.
* genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles.
* sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles.
* nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles.
* one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles.
genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles.
In the human life cycle…
* meiosis produces haploid gametes, and fertilization creates a diploid cell that divides by mitosis to produce a new individual.
* mitosis produces haploid gametes, and fertilization creates a diploid cell that divides by meiosis to produce a new individual.
* diploid gametes are produced by meiosis, and fertilization produces haploid daughter cells that divide by mitosis to produce a new individual.
* diploid gametes are produced by mitosis, and fertilization results in tetraploid daughter cells that divide by meiosis to produce a new individual.
* a haploid zygote is produced by meiosis and fertilization results in a diploid daughter cells that divide by mitosis to produce a new individual.
meiosis produces haploid gametes, and fertilization creates a diploid cell that divides by mitosis to produce a new individual.
The failure of sister chromatids to separate during meiosis is called
nondisjunction
Which of the following is a function only of mitosis?
* organismal growth
* creating genetic variability
* reducing the chromosome number in gametes
* keeping the chromosome number constant from one generation to the next
* producing gametes
organismal growth
Which of the following human syndromes is a monosomy?
* Turner syndrome
* Klinefelter syndrome
* Down syndrome
* Swyer syndrome
* Barr body syndrome
Turner syndrome
The human life cycle consists of
adults who are diploid and produce haploid gametes; these gametes fuse to produce a diploid zygote which grows into an adult.
Skin color is coded for by several different genes which results in a range of skin colors from very dark to very light. This is an example of?
polygenic inheritance
The information in a Punnett square represents
all possible combinations of gametes based on a cross between two parents
Determine if the following statement is true or false. Parents with the dominant phenotype cannot have offspring with the recessive phenotype.
False, because both parents could be heterozygous.
Alleles are
alternate versions of the same gene.
Which of the following is an example of a phenotype?
* AAGg
* freckles
* AA
* Ag
* Gg
freckles
Which of the following is mismatched?
* physical expression of a trait - phenotype
* allele that masks expression of alternate allele - dominant
* identical alleles - heterozygous
* allele whose expression can be masked by an alternate allele - recessive
* the specific alleles that an individual has - genotype
identical alleles - heterozygous
During meiosis, each pair of alleles on the homologous chromosomes sorts independently from all other pairs of alleles. This statement corresponds to
the law of independent assortment
A cow with black and white patches is produced from a white bull and a black cow. This is an example of
codominance
A heterozygote trait exhibiting incomplete dominance will
express an intermediate phenotype.
A woman with type AB blood marries a man who is heterozygous for type B blood. If they have children, what are all the possible blood types for the children?
* AB only
* AB, AA, AO, and BO
* AB, BB, AO, and BO
* BB only
* AA, BB, and AB
AB, BB, AO, and BO
According to Chargaff’s data, ________Blank must pair with ________Blank, and ________Blank must pair with ________.
A; T; C; G
Which of the following enzyme is needed to reseal breaks in the sugar-phosphate backbone during replication?
* DNA polymerase
* RNA polymerase
* topoisomerase
* helicase
* DNA ligase
DNA ligase
DNA replication is called semiconservative because
each resulting DNA molecules is comprised of one new DNA strand and one old strand.
RNA differs from DNA because RNA
is single-stranded, whereas DNA is double-stranded.
Which base is found in DNA, but not in RNA?
thymine
The sequence of the mRNA that would result from transcribing a segment of a DNA template strand with the bases AATAGCGTA would be
* AUGCGAUUA.
* AUUAGCGUA.
* UACGCUAAU.
* UUAUCGCAU.Correct
* ATGCGATTA.
UUAUCGCAU
What is the hereditary material found in all cells?
* DNA
* rRNA
* mRNA
* tRNA
* ATP
DNA