1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
White raven [17]
3 years ago
8

A scientist studying the effects of radiation on DNA performs an experiment in which she exposes a sequence of nitrogen bases fo

und in DNA to radiation. The DNA before and after the radiation is shown below.
Use the evidence to determine whether a mutation has occurred, and if so, interpret that mutation in the answer sheet provided

Before Exposure: ATCGTCA; After Exposure: ATTCGTCA

A. No mutation has occurred to the DNA sequence.

B. A nitrogen base has been deleted from the DNA molecule.

C. A nitrogen base has replaced another nitrogen base in the DNA molecule.

D. A nitrogen base has been added to the DNA molecule.
Biology
1 answer:
Oksana_A [137]3 years ago
6 0

Answer:

D. A nitrogen base has been added to the DNA molecule.  

Explanation:

You can see that the sequence for the nitrogen bases are in the exact same order after the exposure, this rules out A.  You can count how many bases there are, 7 before and 8 after so it cannot be B. Lastly, given that they are in the same order as were before and that a base has been added, you can see that no bases were replaced (so not C) and that D is your answer.  

You might be interested in
The body's endocrine system consists of which glands?
avanturin [10]

The endocrine system<span> refers to the collection of </span>glands<span> of an organism that </span>secrete hormones<span> directly into the </span>circulatory system<span> to be carried towards distant target organs. The major </span>endocrine glands<span> include the </span>pineal gland<span>, </span>pituitary gland<span>, </span>pancreas<span>, </span>ovaries,testes<span>, </span>thyroid gland<span>, </span>parathyroid gland<span>, </span>hypothalamus<span>, </span>gastrointestinal tract<span> and </span>adrenal glands<span>. </span>

6 0
3 years ago
What is the difference between jet streams and global wind belts
ikadub [295]
Jet streams-Are fast flowing, narrow air currents found in the atmospheres of some planets, including earth.
Global wind belts-Are formed by 2 main factors which is the unequal heating of the earth by sunlight and the earths spin.
3 0
3 years ago
The protostome developmental sequence arose just once in evolutionary history, resulting in two main subgroups—Lophotrochozoa an
Lelechka [254]

Answer:

<h2>c. Division of these two groups occurred after the protostome developmental sequence appeared. </h2>

Explanation:

  • Protosomes are such types of organisms in which the mouth part developed first during embryonic development.
  • Those animals in which anus develop first are known as deuterostomes.
  •  This differentiation takes place during the embryonic development of the organisms.
  • Since lophotrochozoan and Ecdysozoa both are protostomes animals and categorized on the basis of molecular evidence.
  • Thus these two groups were formed after the appearance of the protostomes.

8 0
3 years ago
Consider the factors that affect muscular strength. Read each scenario and identify whether each would result in a stronger or w
nlexa [21]

Muscles are required in breathing, talking, running, walking, and any body movement. Actin and myosins are protein filaments present in muscle cells that help to contract and relax or change the shape of muscles. Muscles are responsible for the movement or motion of organisms. Joints are the connection between two or more bones. Most joints are mobile.

Muscle strength is determined by several factors. Some of those are the physical shape, size, and innervation of the muscles.  

Weak contraction

  • Potassium accumulates in the sarcoplasm.
  • Contracted lower sarcoplasm pH.
  • Begin contraction with muscle already 50%.
  • The circular arrangement of muscle fascicles.

Stronger contraction

  • Increase in muscle belly circumference.
  • A lesser proportion of motor neurons to muscle fibers.
  • Increased recruitment.
  • Increased stimulus frequency.

7 0
2 years ago
New cells are made up every second. select every example that would involve new cells being made
Dafna1 [17]

Answer:

? Need more

Explanation:

4 0
3 years ago
Read 2 more answers
Other questions:
  • RNA polymerase possesses its own helicase enzymatic activity. This means that once it binds to a promoter of a gene, it can
    8·1 answer
  • A scientific explanation for a natural occurrence is called
    9·2 answers
  • How does the density of ice compare to that of liquid water and why is that property important to aquatic organisms
    14·2 answers
  • To incorporate desired genes, a______ is used.
    9·2 answers
  • What do scanning electron microscopes and transmission electron microscopes have in common
    15·2 answers
  • In a population the homozygous dominant individuals make up 81% of the population, heterozygous individuals make up 18%, and hom
    5·1 answer
  • Which of the following pathways of CO2 fixation is found in algae and green plants? a. the reverse citric acid cycle b. the 3-hy
    8·1 answer
  • A sharp or "stabbing" pain would be categorized as...
    11·1 answer
  • Which statement best describes how organisms use DNA and amino acids to synthesize a protein
    11·1 answer
  • Which of the following are reasons Earth's atmosphere makes conditions suitable for life? (multiple answers)
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!