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
Sholpan [36]
3 years ago
14

If there is no lactose present, how does bacteria respond? The gene for beta-galactosidase turns on. The gene for beta-galactosi

dase turns off. Lactose is produced. Beta-galactosidase production increases.
Biology
2 answers:
mojhsa [17]3 years ago
6 0

Answer:

The gene for beta-galactosidase turns off.

Explanation:

The gene that codifies the beta-galactosidase enzyme is part of the <em>lac</em> operon, which also contains two other genes that produce enzymes involved in the metabolization of lactose.

Between glucose and lactose, the bacteria will preferentially use glucose as an energy source. On the other hand, lactose is a dimer, and thus a series of enzymes are needed to process lactose before its use as an energy source.

If there is no lactose present, the genes contained inside this operon are turned off (the operon is repressed).

NeTakaya3 years ago
5 0

Answer:

The gene for beta-galactosidase turns off

Explanation:

Beta-galactosidase is an enzyme which cleaves lactose molecule into glucose and galactose.

The lactose-metabolizing enzymes are encoded by the<em> lac</em> operon. The lac operon contains three genes:

  • <em>lac</em>Z encodes beta-galactosidase
  • <em>lac</em>Y encodes lactose permease
  • <em>lac</em>A encodes thiogalactoside transacetylase

In an absence of lactose, Lac repressor binds to <em>lac</em> operator. And as a result of this binding, transcription of <em>lac</em> operon will be prevented. Hence all the above mentioned genes of the <em>lac </em>operon will be repressed or will be turned off.

You might be interested in
Point where crossing over takes place between chromatids of the homologous chromosomes during prophase 1
Free_Kalibri [48]

Answer:

Crossing over occurs during prophase I of meiosis before tetrads are aligned along the equator in metaphase I.

Explanation:

When chromatids "cross over," homologous chromosomes trade pieces of genetic material, resulting in novel combinations of alleles, though the same genes are still present. Crossing over occurs during prophase I of meiosis before tetrads are aligned along the equator in metaphase I.

3 0
2 years ago
Which is the best explaination of a recessive gene?
Elanso [62]
Answer: A gene that is hidden or not expressed.
8 0
3 years ago
Read 2 more answers
Is a pansy, hydrangea, and sunflower a monocot or dicot plant?
Alex73 [517]
Pansies and Sunflowers = Dicots
Hydrangeas = Monocots
3 0
3 years ago
Read 2 more answers
Transcribe the following section of DNA 3’ G C C A T T A G 5’
rjkz [21]

Answer:

theres 2 answers actually

Explanation:

DNA TO RNA :

5’ CGG UAA UC 3’

DNA TO DNA :

5’ CGG ATT TC

3 0
3 years ago
Read 2 more answers
Three advantages of Biodiversity in an ecosystem?
beks73 [17]
It increases ecosystem productivity, protects fresh water resources, and provides nutrient storage and recycling
3 0
3 years ago
Other questions:
  • Compare the amount of hyaline cartilage found in an embryonic skeleton compared to a child
    8·1 answer
  • 1. Name three types of evidence used to support the theory of evolution
    8·1 answer
  • Which vessel of the heart receives blood during right ventricular systole?
    10·2 answers
  • Based on the passage, FSHRs are found on cells of which type(s) of tissue? Connective Epithelial Nervous I only III only I and I
    9·1 answer
  • Identify each of the following structures as haploid or diploid.
    15·2 answers
  • Hemoglobin is
    5·1 answer
  • Match each statement to the type of behavior it describes. Jenna published the results of her latest experiment for the public t
    7·1 answer
  • What is a recessive gene?
    10·2 answers
  • As invasive species, how does the introduction of the feral pig and the water hyacinth impact an ecosystem? (Site 1)
    12·1 answer
  • The potential source of land pollution in your locality​
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!