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Marrrta [24]
3 years ago
9

Once an egg cell is fertilized by sperm, the cell _______.

Biology
2 answers:
Dovator [93]3 years ago
5 0

i think its B. begins to divide and implants itself in the wall of the uterus

Arisa [49]3 years ago
4 0
The answer is B.
- Once an egg cell is fertilized by sperm, the cell begins to divide and implants itself in the wall of the uterus.
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This picture shows examples of a cross section of human skin.
Advocard [28]

Answer:

i don"t know sorry

Explanation:

ask some one

6 0
3 years ago
The trp and lac operons are regulated in various ways. how do bacteria regulate transcription of these operons?
Vlada [557]

Operon is not transcribed:

-lac operon: lactose absent

-trp operon: tryptophan present

Positive control transcription of Operon does not speed it up:

Lactose and glucose are present, -lac operon

Tryptophan is lacking in the -trp operon.

Operon is transcribed quickly through positive control:

-lac operon: lactose present, glucose not

Only negative control is used to regulate the trp operon. The operon genes are not transcribed when tryptophan is present.

Both positive control and negative control are used to control the lac operon.

Negative control: —Transcription is inhibited when lactose is missing due to the activity of the repressor protein.

—The repressor protein is deactivated and transcription is triggered when lactose is present.

Positive control: —In the absence of glucose, another regulatory protein (CAP) attaches to the lac operon's promoter, speeding up transcription in the presence of lactose.

Learn more about lac operons here:

brainly.com/question/1695549

#SPJ4

7 0
1 year ago
Which of the following statements about genetic drift and population size is FALSE?
Yuki888 [10]

Answer:

D

Explanation:

the smaller the population the less likely genetic drift is

6 0
3 years ago
Which layer of the eye completely surrounds the eye except for a dark, round opening called the pupil?
solniwko [45]
I believe the answer would be B. someone correct me if I'm wrong.
3 0
3 years ago
Read 2 more answers
A pea plant with purple flowers (and unknown genotype) is crossed with a pea plant with white flowers. one-half of the offspring
Archy [21]
The genotypes of the parents are Aa (heterozygous) and aa (recessive homozygous).  
 For example:  
 If the purple flower is dominant phenotype, then A is a dominant allele for it and Aa is a genotype which will give the purple colour.
In this case, white flower is recessive phenotype with aa genotype.
If we cross Aa x aa
<span>The offspring is going to be Aa Aa aa aa (half purple and half white)</span>
8 0
3 years ago
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