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3 years ago

Describe two factors that are responsible for regulating the cell cycle. What is their role in the regulation process?

Biology

1 answer:

finlep [7]3 years ago

3 0

Answer:

The cell cycle is controlled by many cell cycle control factors, namely cyclins, cyclin-dependent kinases (Cdks) and cyclin-dependent kinase inhibitors (CKIs). Cyclins and Cdks, which are positive regulators of the cell cycle, activate cell cycle factors that are essential for the start of the next cell cycle phase.

Explanation:

Listen to pronunciation. (sel-SY-kul REH-gyoo-LAY-shun) Any process that controls the series of events by which a cell goes through the cell cycle. During the cell cycle, a cell makes a copy of its DNA and other contents, and divides in two.

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Why do you feel the trachea expand when you're sitting upside down?

jenyasd209 [6]

I think its because when your upside down, your not breathing right. So its a way of trying to breathe correctly.

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3 years ago

The trp and lac operons are regulated in various ways. How do bacteria regulate transcription of these operons? Sort the stateme

OLEGan [10]

Answer:

Operon is not transcribed:

-lac operon: lactose absent

-trp operon: tryptophan present

Operon is transcribed, but not sped up through positive control:

-lac operon: lactose and glucose present

-trp operon: tryptophan absent

Operon is transcribed quickly through positive control:

-lac operon: lactose present, glucose not

Explanation:

The trp operon is controlled via negative control only.

Presence of tryptophan will inhibit the transcription of the operon genes

The lac operon is controlled via negative control and positive control.

●Negative control:

--Transcription is turned off due to

active Repressor protein and absence of lactose

--Transcription is turned on due to

Inactive Repressor protein and presence of lactose

●Positive control:

--Transcription rate is higher due to absence of transcription and presence of lactose as a regulatory protein (CAP) adhere to the lac operon promoter

8 0

3 years ago

Puberty is defined as _________. the production of hormones in the reproductive glands stimulated by the pituitary gland the sta

Lorico [155]

Answer: the physical changes that occur in the body as sexual development reaches its peak

Explanation:

Puberty refers to the transition of a child into an adult. It is characterized by several physical changes induced mainly by hormones. These changes include:

- deep voice in males; high pitch voice in females

- growth of pubic hairs in males and females

- presence of thicker skin in males; delicate and lighter skin in females

- emergence of breast in females, broad chest in males etc

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3 years ago

On which of the following surfaces of permanent teeth is pit and fissure caries MOST likely to occur? A. Facial surfaces of maxi

aksik [14]

Answer:

Explanation:

A pit is a tiny depression which is found on the surface of the tooth.

Fissures are the grooves that occur naturally on the biting surfaces of teeth.

Thus, pits and fissures are located on the lingual surfaces of the maximillary first molars because of the lingual fissures on the max molars.

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4 years ago

Andrei [34K]

<span>All of their skulls were fairly long with sharp teeth.</span>

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3 years ago

Read 2 more answers