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
SSSSS [86.1K]
2 years ago
15

The Lac Operon is a set of genes that controls the production of lactase the enzyme that digests

Biology
1 answer:
Romashka [77]2 years ago
4 0

Answer:

The lactose present prevents the production of lactase

Explanation:

This question is describing a set of genes in bacteria called LAC OPERON. Lac operon controls the production of lactase, which is the enzyme that digests lactose. However, this gene can be regulated at the transcription level i.e caused to be transcribed or not depending on certain factors.

According to the question, lac operon, which regulates the production of enzymes will be transcribed and subsequently translated i.e. turned on when there is a substrate (lactose) that the produced enzyme will work on. However, when there is no need of the lactase enzyme or there is absence of lactose (substrate), the lac operon gene is turned off.

Note that, the statement that "The presence of lactose prevents the production of lactase" is not correct.

You might be interested in
Place the following events of muscle excitation in the correct order.
svetlana [45]

An motion potential in the presynaptic cell activates calcium channels. Ca+ triggers the discharge of Acetylcholine through exocytosis. Ach binds its receptors in the postsynaptic membrane, opening Na+ channels. The Order is 4, 3, 5, 1, 2.

The principal frightened system generates an motion potential that travels to the goal activating the calcium channels ⇒ event (4)

Calcium triggers vesicles fusion to the presynaptic membrane. By exocytosis, vesicles release the neurotransmitter -Acetylcholine- into the synaptic space ⇒ event (3)

Once there, Ach binds to its receptors on the postsynaptic membrane of the skeletal muscle fiber, causing ion channels to open ⇒ event (5)

Positively charged sodium ions move the membrane to get into the muscle fiber (sarcoplasm) and potassium leaves the cell ⇒ event (1)

The distinction in charges, resulting from these ions' transport, positively charges the fiber membrane. The postsynaptic cell depolarizes ⇒ Event (2)

The motion potential enters the t-tubules depolarizing the internal part of the muscle fiber. Contraction initiates while the motion potential depolarizes the internal part of the muscle fiber. Calcium channels spark off in the T tubules membrane, releasing calcium into the sarcolemma.

At this point, the muscle is at rest, and the tropomyosin is inhibiting the appeal strengths between myosin and actin filaments. Tropomyosin is obstructing binding sites for myosin on the skinny filament.

When calcium enters the sarcolemma, it binds to troponin C, and troponin T alters the tropomyosin role through shifting it and unblocking the binding sites.

Myosin heads be a part of the uncovered actin-binding points forming move-bridges, and whilst doing so, ATP turns into ADP and inorganic phosphate, that's released.

Myofilaments slide impulsed through chemical energy accumulated in myosin heads, generating a strength stroke. The strength stroke initiates while the myosin move-bridge binds to actin. As they slide, ADP molecules are released. A new ATP hyperlinks to myosin heads and breaks the bindings to the actin filament.

Then ATP splits into ADP and phosphate, and the energy produced is gathered in the myosin heads, which begins offevolved a new binding cycle to actin.

Finally, Z-bands are pulled towards every other, and the sarcomere and the I-band get shorter, generating muscle fiber contraction.

According to those steps, the appropriate order of activities is 4, 3, 5, 1, 2.

To learn more about Acetylcholine, click here:

brainly.com/question/13821381

#SPJ4

7 0
9 months ago
Find the kinetic energy of a ball moving at 45 m/s with a mass of 0.18kg
mamaluj [8]

Answer:182.25 joules

Explanation:

Mass=0.18kg

Velocity=45m/s

Kinetic energy=(mass x(velocity)^2)➗2

Kinetic energy=(0.18 x 45^2) ➗ 2

Kinetic energy=(0.18x45x45) ➗ 2

Kinetic energy=364.5 ➗ 2

Kinetic energy=182.25

Kinetic energy=182.25 joules

5 0
3 years ago
??????????????????!????
makvit [3.9K]

Dominant: the more common trait (brown hair)

Recessive: a trait that doesn't show up unless both parents carry it (blue eyes)

Co- dominant: both traits show up and co- exist (AB blood)

Incomplete dominance: when a dominant gene does not completely mask a recessive gene so they blend (pink flower)

Phenotype: physical trait- able to be seen (stripes on a zebra)

Genotype: genetic makeup of an organism - genetic trait

Hetrozygous: different (Bb)

Homzygous dominant: same and dominant (bb) and (BB)

Purebred: same as homzygous- has same alleles (bb) and (BB)

Hybrid: also known as heterozygous traits

1.

75%

25%

orange (AA) blue (aa)

2 orange Aa

2.

0%

100%

Hetrozygous

7 0
3 years ago
Bonjour ☺️
garri49 [273]

Answer:

les glandes produisent deux produits essentiels :

-gamètes. les mâles produisent du sperme et les femelles produisent des ovules (œufs). la formation des gamètes dépend d'un type particulier de division cellulaire appelé méiose

-hormones sexuelles. ces hormones stéroïdes - principalement la testostérone chez les hommes, les œstrogènes et la progestérone chez les femmes - jouent un rôle vital à la fois dans le développement et la fonction des organes reproducteurs et dans le comportement et les pulsions sexuelles. ces hormones influencent également la croissance et le développement de nombreux autres organes et tissus du corps

Explanation:

6 0
2 years ago
How many differents genus groups are there? list them.​
lbvjy [14]

http://1kai.dokkyomed.ac.jp/mammal/en/genus_list.html

4 0
3 years ago
Other questions:
  • Meiotic nondisjunction could be a result of ______
    12·1 answer
  • 11. Which of the following compounds is formed when three fatty acids covalently bond to
    14·1 answer
  • How many copies of the first chromosomes does a human haploid cd contains
    9·1 answer
  • Which is one major product of the ETS series of reactions
    13·1 answer
  • How does the suns energy effects the climate of an area
    10·1 answer
  • HELP!! WILL GIVE BRAINLIEST TO 1ST ANSWER!!! NO SPAM PLS!!!!!!!
    6·1 answer
  • How does natural selection lead to the development of antibiotic-resistant bacteria? ​
    11·2 answers
  • WILL MARK BRAINLIEST IF CORRECT
    15·1 answer
  • What is the desired product of cellular respiration
    13·2 answers
  • Which are vectors?<br><br><br> animals<br> water<br> air<br> food<br> objects
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!