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Principles of Biology I - Unit 3 Quiz

Description

unit 3 multiple choice questions from practice exam
dumb himbo
Quiz by dumb himbo, updated more than 1 year ago
dumb himbo
Created by dumb himbo about 3 years ago
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Resource summary

Question 1

Question
An organism’s ________________ is determined by its _________________.
Answer
  • Genotype; phenotype
  • Phenotype; genotype
  • Allele; phenotype
  • F1 generation; allele

Question 2

Question
What are Barr bodies?
Answer
  • 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

Question 3

Question
If one strand of a DNA molecule has the sequence ATTGCAT, then the complementary strand will have the sequence
Answer
  • ATTGCAT
  • TACGTTA
  • TAACGTA
  • GCCTAGC

Question 4

Question
What is the central dogma of molecular biology?
Answer
  • 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

Question 5

Question
Nondisjunction results in
Answer
  • An improper number of chromosomes
  • aneuploidy
  • None of the above
  • Both a and b above

Question 6

Question
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
Answer
  • Mendel’s second law of heredity
  • The principle of segregation
  • Law of independent assortment
  • Mendel’s third law of heredity

Question 7

Question
When more than one gene affects a trait, this is known as ____________ and an example of this can be found with _______________.
Answer
  • Pleiotropy; eye color
  • Incomplete dominance; hairline
  • Polygenic inheritance; eye color
  • Codominance; sex-linked disorders

Question 8

Question
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:
Answer
  • Incomplete dominance
  • Codominance
  • Segregation
  • Epistasis

Question 9

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

Question 10

Question
If an organism’s DNA is known to be composed of 23% adenine, what percentage of their DNA would be composed of guanine?
Answer
  • 27%
  • 23%
  • Unable to determine from the data given
  • 46%

Question 11

Question
The process in which DNA is used as a template to form another DNA molecule is called
Answer
  • Transcription
  • Reverse transcription
  • Replication
  • Translation

Question 12

Question
In addition to adding bases to the growing DNA strand during replication, DNA polymerase is also responsible for
Answer
  • Proofreading the new DNA molecule as it is being synthesized
  • Synthesizing RNA
  • Making proteins
  • DNA polymerase has only the one function

Question 13

Question
DNA is always synthesized in the __________ direction and because of this, the lagging strand is synthesized ______________, forming Okazaki fragments.
Answer
  • 3’-5’; discontinuously
  • 3’-5’; continuously
  • 5’-3”; discontinuously
  • 5’-3’; continuously

Question 14

Question
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:
Answer
  • Photorepair
  • Mutagen repair
  • Radiation
  • Excision repair

Question 15

Question
What is added to eukaryotic transcripts following transcription
Answer
  • 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

Question 16

Question
Where does translation occur in eukaryotes?
Answer
  • In the nucleus
  • In the golgi apparatus
  • On the ribosomes
  • In a vacuole

Question 17

Question
A mutation that alters a single base but does not alter the amino acid that is coded for is called a _________ mutation.
Answer
  • Missense
  • Silent
  • Nonsense
  • noisy

Question 18

Question
Which of the following is a good example of epistasis?
Answer
  • 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
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