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JCHS Biology Semester 2 Final Review Flashcards | StudBud
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JCHS Biology Semester 2 Final Review
JCHS Biology Semester 2 Final Review
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Semester 2 Final Exam review.
Flashcards
75 cards
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Practice quiz
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Questions
75
Answers
1
Genes contain instructions for assembling
proteins.
operons.
mutagens.
2
What did Rosalind Franklin contribute to the effort to identify the structure of DNA?
radioactive evidence that DNA carried the genetic code
x-ray diffraction photos of the DNA molecule
the ratios of the two sets of nucleotide pairs in DNA
3
Human females produce egg cells that have
two X chromosomes.
one X or one Y chromosome.
one X chromosome.
4
Which of the following pairs of genotypes result in the same phenotype?
IBIB and IBi
IBIB and IAIB
IAIA and IAIB
5
The genetic drift that follows colonization of a new habitat by a small group of individuals is
the founder effect.
the Hardy-Weinberg principle.
directional selection.
6
Compared to a polygenic trait, a single-gene trait tends to have
fewer phenotypes.
the same number of phenotypes.
phenotypes that form a bell-shaped curve.
7
People of Charles Darwin’s time understood that fossils were
unrelated to living species.
available for every organism that ever lived.
preserved remains of ancient organisms.
8
The Punnett square in Figure 11–3 shows that the gene for pea shape and the gene for pea color
assort independently.
have the same alleles.
are always homozygous.
9
In humans, the pelvis & femur are involved in walking. In whales, the pelvis & femur shown are
examples of fossils.
vestigial structures.
examples of natural variation.
10
What stores information in a cell?
proteins
DNA
carbohydrates
11
How many nucleotides are needed to specify three amino acids?
9
12
3
12
What is formed at the end of meiosis?
four genetically different cells
two genetically identical cells
four genetically identical cells
13
An advantage of sexual reproduction over asexual reproduction is that sexual reproduction
provides genetic diversity
requires more time
produces identical offspring
14
Shaded symbols = affected people. Male = ⧠; women = O. An X chrom sex-linked. What is circle 1?
She has two alleles for the disorder.
She has no alleles for the disorder.
She has one allele for the disorder.
15
Rabbits have 4 different versions of the coat color gene. What pattern of inheritance is this?
multiple alleles.
incomplete dominance.
polygenic inheritance.
16
Variation in human skin color is an example of
polygenic traits.
codominance.
multiple alleles.
17
Which is the correct sequence of the transfer of information in most organisms?
RNA to protein to DNA
RNA to DNA to protein
DNA to RNA to protein
18
How many chromosomes are shown in a normal human karyotype?
2
46
44
19
When during the cell cycle is a cell’s DNA replicated?
M phase
G2 phase
S phase
20
The genes carried by all members of a particular population make up the population’s
gene pool.
phenotype.
genotype.
21
17–1 shows increasing beak size for a birds. When 1 end of a bell curve shows high fitness it's
directional selection.
disruptive selection.
genetic drift.
22
Sex-linked genes are located on
the Y chromosome only.
the X chromosome only.
the autosomal chromosomes.
both the X chromosome and the Y chromosome.
23
What is produced during transcription?
proteins
DNA molecules
RNA molecules
24
In which cells is the accurate transmission of information most important?
sex cells
bone cells
nerve cells
25
The process by which a cell divides into two daughter cells is called
metaphase.
cell division.
mitosis.
26
The different forms of a gene are called
alleles.
traits.
hybrids.
27
Which molecules are involved in protein synthesis?
messenger RNA, ribosomal RNA, and transfer RNA
messenger RNA, introns, and ribosomal RNA
ribosomal RNA, transfer RNA, and mutagens
28
Which of the following statements defines the members of a species?
They have identical genes.
They mate and produce offspring.
They are geographically isolated from each other.
29
The number of chromosomes in a gamete is represented by the symbol
N.
Y.
X.
30
One difference between a gene mutation and a chromosomal mutation is that
A chromosomal mutation can change the # of chromosomes.
Chromosome mutation more likely to be passed on to offspring
Gene mutation can involve insertion/deletion, not frameshift
31
Which of the following is true?
DNA is usually single-stranded.
RNA is usually single-stranded.
DNA contains uracil.
32
That Darwin’s Galápagos finches have similar characteristics supports the hypothesis that they
all eat the same type of food.
have the ability to interbreed.
descended from a common ancestor.
33
Early on, all cells in the embryo are identical. Later, they will become specialized through
differentiation.
apoptosis.
interphase.
34
Because of base pairing in DNA, the percentage of
thymine molecules in DNA is about = to adenine molecules
cytosine % in DNA much greater than % of guanine molecules
adenine molecules in DNA is much greater than thymine.
35
Each of the following is a condition necessary for natural selection to occur EXCEPT
population size is very large.
there is heritable variation among members of the population
fitness varies among individuals.
36
According to Darwin’s theory of natural selection, individuals that tend to survive have
characteristics that plant and animal breeders value.
the greatest number of offspring.
variations best suited to environmental conditions.
37
A change in the genetic material of a cell is called a
mutation.
polygenic trait.
recombination.
38
Using Figure 13–2, what kind of amino acid does the codon CAG form?
serine
leucine
glutamine
39
Which of the following combinations of sex chromosomes represents a female?
XXXY
XXY
XX
40
Sexual reproduction contributes to genetic diversity by allowing
unmixed genes from two parents to be passed to offspring.
genes of 2 parents to be mixed before passing to offspring
a single parent to pass along complete set of unmixed genes.
41
In Figure 14–1, what is the approximate probability that a human offspring will be female?
75%
50%
10%
42
Which statement about evolution in the Galápagos finches is true?
Natural selection on beak size/shape driven by avail. food
Mate choice likely plays no role in the finches’ evolution.
Stabilizing selection favors an intermediate beak type.
None of the finch species is reproductively isolated.
43
The principle of common descent helps explain why
birds & reptiles share a number of inherited characteristics
well-adapted species have many offspring.
An organism’s environment ensures the organism’s survival.
44
Molecular evidence in support of natural selection includes
the nearly universal genetic code.
the presence of vestigial structures.
the transmission of acquired characteristics by DNA.
45
Which scientist(s) figured out that the shape of a DNA molecule is a double helix?
Hershey and Chase
Watson and Crick
Franklin
46
In both prokaryotes & eukaryotes, how many copies of the chromosome are left after replication?
2
3
4
47
Cancer is a disorder in which some cells have lost the ability to control their
size.
surface area.
growth rate.
48
All of the following are problems that growth causes for cells EXCEPT
excess oxygen.
expelling wastes.
obtaining enough food.
49
DNA replication results in two DNA molecules,
1 with 2 new strands and the other with 2 original strands.
each with two original strands.
each with one new strand and one original strand.
50
Figure 12–4 is the % of bases in a DNA sample. How much Cytosine should find in the sample?
24%
28%
44%
51
The Galápagos finch species are an excellent example of
genetic equilibrium.
selection on single-gene traits.
speciation.
52
In Figure 11–1, which of the following is true about the offspring resulting from the cross?
All are expected to be tall.
About half are expected to be short.
About three fourths are expected to be tall.
53
Why are stem cells important?
They are incapable of becoming cancer cells.
They have the potential to develop into other cell types.
They have specialized DNA.
54
Darwin noticed that many organisms seemed well suited to
surviving in the environments in which they lived.
providing humans with food.
swimming from South America to the Galápagos Islands.
55
During which phase in the cell cycle does mitosis happen?
G2 phase
M phase
G1 phase
56
If an organism’s diploid number is 24, its haploid number is
6.
24.
12.
57
Which RNA brings information in the genetic code from the nucleus to other parts of the cell?
rRNA
mRNA
tRNA
58
Organisms that have two identical alleles for a particular trait are said to be
homozygous.
dominant.
hybrid.
59
Human males have
two X chromosomes.
one X and one Y chromosome.
two Y chromosomes.
60
Cell division is represented in Figure 10–3 by the letter
A.
C.
D.
61
Colorblindness is more common in males than in females because the allele for colorblindness is
dominant and located on the X chromosome.
recessive and located on the Y chromosome.
recessive and located on the X chromosome.
62
A factor that is necessary for the formation of a new species is
reproduction at different times.
reproductive isolation.
geographic barriers.
63
Gametes are produced by the process of
crossing-over.
meiosis.
mitosis.
64
During DNA replication, a DNA strand that has the bases CTACCT produces a strand with the bases
TCGAAC.
GATGGA.
AGCTTG.
65
Genetic drift tends to occur in populations that
are very large.
are formed from new species.
are small.
66
The structures labeled B in Figure 10–5 are called
sister chromatids.
centromeres.
spindles.
67
Gregor Mendel’s principles of genetics apply to
pea plants only.
plants only.
all organisms.
68
The Human Genome Project is an attempt to
sequence every person’s DNA.
sequence the DNA of every human gene.
cure infectious human diseases.
69
Which nucleotide in Figure 13–1 indicates the nucleic acid above is RNA?
uracil
cytosine
guanine
70
The hypothesis that all species are descended from common ancestors was proposed by
Charles Darwin.
Thomas Malthus.
James Hutton.
71
In both prokaryotes and eukaryotes, DNA replication happens
before cell division.
around the histones.
only to telomeres.
72
When a dairy farmer breeds cows that give the most milk, the farmers are using the principle of
descent with modification.
artificial selection.
natural selection.
73
In eukaryotes, DNA
is circular.
is located in the ribosomes.
is located in the nucleus.
74
Which of the following represents the phases of mitosis in their proper sequence?
prophase, anaphase, metaphase, telophase
prophase, metaphase, anaphase, telophase
interphase, prophase, metaphase, telophase
75
In Figure 13–3, which amino acid is specified by the mRNA code AAA?
Ala
Pro
Lys