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unit 3 multiple choice questions from practice exam

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Principles of Biology I - Unit 3 Quiz

Principles of Biology I - Unit 3 Quiz

Pregunta 1 de 18

1

An organism’s ________________ is determined by its _________________.

Selecciona una de las siguientes respuestas posibles:

  • Genotype; phenotype

  • Phenotype; genotype

  • Allele; phenotype

  • F1 generation; allele

Explicación

Pregunta 2 de 18

1

What are Barr bodies?

Selecciona una de las siguientes respuestas posibles:

  • X chromosomes inactivated to prevent over-expression of the alleles found on the X chromosome in females

  • Highly condensed Y chromosomes in males

  • X chromosomes inactivated to allow for expression of the males-specific phenotype

  • Inactive autosomal chromosomes specific to females

Explicación

Pregunta 3 de 18

1

If one strand of a DNA molecule has the sequence ATTGCAT, then the complementary strand will have the sequence

Selecciona una de las siguientes respuestas posibles:

  • ATTGCAT

  • TACGTTA

  • TAACGTA

  • GCCTAGC

Explicación

Pregunta 4 de 18

1

What is the central dogma of molecular biology?

Selecciona una de las siguientes respuestas posibles:

  • DNA is the genetic material.

  • Information passes from DNA to protein.

  • Information passes from DNA to RNA to protein

  • One gene encodes only one polypeptide

Explicación

Pregunta 5 de 18

1

Nondisjunction results in

Selecciona una de las siguientes respuestas posibles:

  • An improper number of chromosomes

  • aneuploidy

  • None of the above

  • Both a and b above

Explicación

Pregunta 6 de 18

1

The principle that states that two alleles for a gene separate during gamete formation and are rejoined at random, one from each parent during fertilization is called

Selecciona una de las siguientes respuestas posibles:

  • Mendel’s second law of heredity

  • The principle of segregation

  • Law of independent assortment

  • Mendel’s third law of heredity

Explicación

Pregunta 7 de 18

1

When more than one gene affects a trait, this is known as ____________ and an example of this can be found with _______________.

Selecciona una de las siguientes respuestas posibles:

  • Pleiotropy; eye color

  • Incomplete dominance; hairline

  • Polygenic inheritance; eye color

  • Codominance; sex-linked disorders

Explicación

Pregunta 8 de 18

1

In certain flowers, the heterozygous condition is displayed as an intermediate phenotype between the two homozygous conditions. For example, crossing red snapdragons with white snapdragons produces pink snapdragons. This is an example of:

Selecciona una de las siguientes respuestas posibles:

  • Incomplete dominance

  • Codominance

  • Segregation

  • Epistasis

Explicación

Pregunta 9 de 18

1

Nondisjunction of the sex chromosomes is much more likely to occur in women than in men because

Selecciona una de las siguientes respuestas posibles:

  • this is not true; nondisjunction occurs equally in men and women

  • Women have two X chromosomes to the one X chromosome in men

  • Women’s eggs have developed prior to birth while men form new sperm cells daily and so the eggs are much older.

  • It is carried on the X chromosome

Explicación

Pregunta 10 de 18

1

If an organism’s DNA is known to be composed of 23% adenine, what percentage of their DNA would be composed of guanine?

Selecciona una de las siguientes respuestas posibles:

  • 27%

  • 23%

  • Unable to determine from the data given

  • 46%

Explicación

Pregunta 11 de 18

1

The process in which DNA is used as a template to form another DNA molecule is called

Selecciona una de las siguientes respuestas posibles:

  • Transcription

  • Reverse transcription

  • Replication

  • Translation

Explicación

Pregunta 12 de 18

1

In addition to adding bases to the growing DNA strand during replication, DNA polymerase is also responsible for

Selecciona una de las siguientes respuestas posibles:

  • Proofreading the new DNA molecule as it is being synthesized

  • Synthesizing RNA

  • Making proteins

  • DNA polymerase has only the one function

Explicación

Pregunta 13 de 18

1

DNA is always synthesized in the __________ direction and because of this, the lagging strand is synthesized ______________, forming Okazaki fragments.

Selecciona una de las siguientes respuestas posibles:

  • 3’-5’; discontinuously

  • 3’-5’; continuously

  • 5’-3”; discontinuously

  • 5’-3’; continuously

Explicación

Pregunta 14 de 18

1

Some errors that may occur during DNA replication may be repaired. The type of repair that does not require the presence of light is known as:

Selecciona una de las siguientes respuestas posibles:

  • Photorepair

  • Mutagen repair

  • Radiation

  • Excision repair

Explicación

Pregunta 15 de 18

1

What is added to eukaryotic transcripts following transcription

Selecciona una de las siguientes respuestas posibles:

  • 5’ cap and a 3’ poly A tail

  • 3’ cap and a 5’ poly A tail

  • 5’ hat and a 3’ poly B tail

  • 3’ bonnet and a 5’ poly A tail

Explicación

Pregunta 16 de 18

1

Where does translation occur in eukaryotes?

Selecciona una de las siguientes respuestas posibles:

  • In the nucleus

  • In the golgi apparatus

  • On the ribosomes

  • In a vacuole

Explicación

Pregunta 17 de 18

1

A mutation that alters a single base but does not alter the amino acid that is coded for is called a _________ mutation.

Selecciona una de las siguientes respuestas posibles:

  • Missense

  • Silent

  • Nonsense

  • noisy

Explicación

Pregunta 18 de 18

1

Which of the following is a good example of epistasis?

Selecciona una de las siguientes respuestas posibles:

  • red and white snapdragons are bred and the offspring are pink

  • Himalayan rabbits produce temperature-sensitive products

  • when mice have one copy of the spinning gene they spin but with two copies, they die.

  • E gene determines fur color of Labrador retrievers and the B gene determines the darkness of the pigment

Explicación

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