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anyanavicka [17]
2 years ago
13

What is a substance?

Biology
2 answers:
Dafna11 [192]2 years ago
7 0
A substance is usually a form of matter having constant chemical composition and characteristic properties.
fomenos2 years ago
6 0

Answer:

the real physical matter of which a person or thing consists and which has a tangible, solid presence.

Explanation:

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How long does it take a human blood cell to make a complete circuit of the human body?
Serjik [45]
It takes about one minute for a blood cell to make a complete circuit of the human body.
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Which chromosomal defect is caused when part of a chromosome breaks off and reattaches backward on the same chromosome?
LiRa [457]

The right answer is inversion.

Inversion is a genetic mutation characterized by the end-to-end reversal of a portion of chromatid on a chromosome.

In other words, it is a double break then it is replaced after rotation of 180 ° of a chromosome segment (backward insertion).

We distinguish :

Paracentric inversions:  The centromere in the chromosome is not included in the inversion.

Pericentric inversions:  The centromere is included in the inversion which transforms a metacentric chromosome into an acrocentric chromosome.

8 0
3 years ago
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Which of the following are among the most common second messengers?
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Answer:

The correct answer would be calcium ion and cAMP.

Secondary messengers refers to the intracellular signaling molecules which pass the signals from the receptors located on the surface of the cell to the target molecule present within the cell.

The secondary messengers can be classified into three major class:

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  3. Calcium ions (Ca⁺⁺)  

Hence, from the given options, calcium ion and cAMP would make the correct choice.

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3 years ago
Life-forms that existed during the paleozoic era included ____.
sdas [7]
The correct option is D. all of the above
3 0
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How does ATP supply energy for cellular activities?
kvv77 [185]

Answer:   ATP (adenosine tri-phosphate) supplies energy for cellular activities when one of its phosphate bonds is broken.

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