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3 years ago

What are exons and introns and how are they dealt with in the cell?

Biology

1 answer:

Mkey [24]3 years ago

5 0

Answer:

Exons are coding sections of an RNA transcript, or the DNA encoding it, that are translated into protein. Exons can be separated by intervening sections of DNA that do not code for proteins, known as introns.

Explanation:

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15. If a person feels pressure on her bladder, then she is experiencing -

Nutka1998 [239]

D to release external waste.

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3 years ago

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If a person has a blood-calcium (Ca) level of 8 mg/100 mL of blood, which of the following

brilliants [131]

Answer:

The kidneys take of up more Ca2+ and release vitamin D. The bones release Ca2+. The intestines increase reabsorption of Ca2+.

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3 years ago

Which of the following statements is false?

storchak [24]

Answer:

O A. Carnivorous plants get their energy from eating bugs.false

B. Carnivorous plants do not get nutrients from the soil. false

O C Carnivorous plants get their energy from the sun.

o true

D. Carnivorous plants get their nutrients from eating bugs.true

Explanation:

4 0

2 years ago

Hi, if you could please help with this biology worksheet, it would be greatly appreciated!

poizon [28]

Answer No 1:

DNA: ACG TCC GCT CGT ATT

mRNA: UGC AGG CGA GCA UAA

AA sequence: Cys- Arg- Arg- Ala- Stop

Answer No 2:

The correct option is D) Both B and C

Explanation:

As we can see, The codons mentioned in the options Band C code for the same amino acid sequence hence, option D is the correct option.

Answer No 3:

The correct option is b) CAU

Explanation:

As we can see from the code table, the code CAU is for the amino acid histidine, hence it is not the code among the options shown which codes for Arg. All the other options mentioned in a,c and d code for Arg.

Answer no 4:

The correct option is A) nucleus

Explanation:

All eukaryotic organisms have their DNA enclosed in a membrane bound structure known as the nucleus. For prokaryotes, however, the DNA is present in the cytoplasm as they lack a nucleus. In eukaryotes, the DNA never leaves the nucleus. It is always present inside it.

Answer No 5:

The correct option is b) Translation

Explanation:

Translation can be described as the process by which the code on the mRNA is translated and protein is made from the mRNA. The process of translation occurs in the ribosomes. The mRNA leaves the nucleus after being formed by transcription and is translated by the ribosome machinery as depicted in the image shown.

Answer No 6:

The correct option is b) hydrogen bonds

Explanation:

The structure of the DNA is double- helix. This means that the DNA contains two strands. The two stands of the DNA are joined by the hydrogen bonds which arise by the formation of bonds between the nucleotide bases. Adenine of one strand pairs with thymine of the other strand. Cytosine of one strand pairs with Guanine of the other strand.

Answer No 7:

The correct option is A) phosphate

Explanation:

The structure of DNA is double helix and made up of three basic parts which are the nitrogenous bases, deoxyribose sugar and phosphate. The phosphate- sugar make up the backbone of the DNA. The hydrogen bonds present between the nucleotide bases of the two strands keep the DNA intact. Hence, the circle in the image represent phosphate.

Answer No 8:

The correct option is c) deoxyribose

Explanation:

A ribose can be described as a sugas which contain 5 carbon atoms. In DNA, an oxygen atom from the ribose sugar is removed and hence it is termed as deoxyribose. The sugars and phosphates make up the back-bone of the DNA. Hence, we can easily depict that the pentagon structure in the diagram is of deoxyribose sugar.

Answer No 9:

The correct option is d) DNA→ transcription→ mRNA→ translation→ amino acids→proteins

Explanation:

The steps for the formation of a protein are as follows:

By the process of transcription, DNA from which a protein is to be made is transcribed into mRNA. This happens by transcription- assembly. transcription occurs in the nucleus
By the process of translation, the mRNA is converted into amino acids by the ribosome machinery present in the cytoplasm.
Amino acids join by peptide bonds to form the desired protein.

3 0

3 years ago

Select the statement(s) that accurately illustrate scenarios of weathering. Water flows into cracks in a rock, freezes and expan

lukranit [14]

Answer:

The question would be properly written with options attached for the sake of comprehension:

Select the statement(s) that accurately illustrate scenarios of weathering.

A. Water flows into cracks in a rock, freezes, and expands, pushing against the crack making it wider.

B. Wind gusts carry large amounts of sand across the landscape creating a sandstorm.

C. Plant roots expand cracks in rocks as the plant grows.

D. Sand particles in the blowing wind may act like sandpaper to rub against the rocks and wear off small particles.

E. Oxygen in the air reacts with iron ore in a rock creating streaks of rust

The correct options in the question above are:

Options A, C, D, and E.

Explanation:

First, Weathering is the actions that lead to the gradual but continuous breakdown of rocks and minerals into soils. There are two main kinds of weathering: mechanical weathering and chemical weathering.

From the question above, options A, C, and D are all examples of mechanical weathering where rocks are broken down physically into smaller pieces.

Option B would have also been correct but didn't mention that the sandstorm brushed against the rock or collided with it.

While option E is an example of chemical weathering because of the chemical reaction between the oxygen in the air and the iron ore in rock. This results in the breakdown of minerals that are rich in iron forming new compounds creating rust.

6 0

3 years ago