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Oksi-84 [34.3K]
3 years ago
15

Science forums matt and monica have been trying to get pregnant for two years. no wonder it is so difficult! they just found out

that the average couple is fertile for only about ________ each month.
Biology
1 answer:
Natalka [10]3 years ago
5 0
They just found out that the average couple is fertile for only about 6-7 days each month.
For some women, it is really easy to get pregnant, whereas others may have to try many times until they can have a baby. This is related to many things, such as whether the couple is having relations when the woman is ovulating, and such.
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Why doesn't mom have to worry when her 4-year-old threatens to hold his breath till he dies?
ehidna [41]

Answer:

Because if the 4-year-old child passes out from holding his breath, he will immediately begin breathing again, keeping him alive.

4 0
3 years ago
The notable hardness of bone is attributed to ________. the notable hardness of bone is attributed to ________. the presence of
Sloan [31]

 The notable hardness of bone is attributed to the presence of inorganic hydroxyapatites. Due to the calcium salts deposited in it, resulting to the hardness. The abnormal hardness of bone, which allows it to resist the compression.

6 0
3 years ago
Marlee and her family were spending time at the beach. Marlee and her brother made this tower with rocks they found on the beach
WINSTONCH [101]

Answer:The rocks are smooth due to the water eroding the rocks.

Explanation:

The water slowly takes off minerals of the rocks every time is splashes over them. Over time the rocks bumpy surface would be eroded away giving it a smoother surface.

8 0
3 years ago
1. Suppose the synthesis of an amino acid was accomplished by four enzymes encoded by four genes that formed an operon. Draw a m
vivado [14]

I have attached lac operon model having 4 genes. See attachment for better understanding.

Answer:

The Lac operon is controlled  by two signals.

Initiation

Glucose and lactose  concentrations control the initiation of  transcription of the Lac operon through  their effects on the Lac repressor protein  and Cap.

Lactose absent (Repression)

When lactose is absent, the Lac  repressor binds the Lac operator and shuts  off expression of the operon.

Lactose present (Transcription)

Addition  of lactose increases the intracellular  concentration of a related compound,  allolactose. allolactose binds to the  Lac repressor, causing it to undergo a  conformational change that releases its grip  on the operator DNa.

Glucose absent (Repression)

When  glucose is absent, cyclic aMp (red triangle)  is produced by the cell and Cap binds to  DNA.

Glucose present (Transcription)

LacZ, the first gene of the operon,  encodes the enzyme b-galactosidase, which  breaks down lactose to galactose and  glucose.

7 0
3 years ago
1. In the process of (selective breeding / natural selection/hybridization/
DerKrebs [107]

Answer:

selective breeding; biotechnology

Explanation:

Selective breeding is a type of artificial selection that consists of crossing plants/animals with desirable and heritable phenotypic traits in order to increase the frequency of such traits in progeny. Selective breeding can be considered as one of the first biotechnological techniques applied by humans. In the past, the selective breeding technique has allowed obtaining domesticated animals (e.g., dogs from wild wolves) and domesticated crops from their wild ancestors (e.g., maize from its wild ancestor teosinte).

7 0
3 years ago
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