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inessss [21]
3 years ago
14

At which PH is pepsin most active?

Biology
1 answer:
Zolol [24]3 years ago
4 0
Pepsin is most active in acidic environments between 37 °C and 42 °C. Accordingly, its primary site of synthesis and activity is in the stomach (pH 1.5 to 2).
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Which of the following is/are true?
Softa [21]

Answer: Only Options A, C and E are correct

A) Sympatric speciation is best described as a random event that disrupts the allele frequencies in a population

C) Sympatric speciation does not require geographic isolation.

E) Sympatric speciation can be due to sexual(mate) selection

Explanation:

Sympatric speciation is a random or naturally occurring event whereby organisms of the same species:

> live in the same territory or nearby territories ( i.e not living in isolation)

> DO NOT interbreed, but select a sexual mate from a much diverse territory which results in an uneven gene flow or disruption of alleles among the population of same species of the parents organisms.

3 0
3 years ago
Which diagram shows the pathway of energy through an ecosystem?
Iteru [2.4K]
Question 1:
The correct answer should be the one that shows the producer first, (->) followed by the herbivore, (->) with the carnivore last.
Producers are organisms that harvest their own 'food' using things like the sunlight and water. Examples of producers are grass and other vegetation.

Producer
The herbivore, or an organism that consumes only vegetation and/or algae, consumes the producer.

Producer ⇒ Herbivore
The carnivore consumes meat, or other animals such as the herbivore. It's the last. 

Producer ⇒ Herbivore ⇒ Carnivore
Therefore the answer is B. 
____________________________________________________________
Question 2:
 I'm pretty sure that succession as well as regrowth after volcanic eruption (Just look at Mount St. Helens. After 30-35 years after the eruption, nature is still recovering) happens over time/slowly. I would say global warming [C](?) would be the answer. 
5 0
3 years ago
Read 2 more answers
If the circulatory system failed what would happen to the heart rate?
Gelneren [198K]
The heart rate would decrease because there is less oxygen being supplied to the cells for cellular respiration, and also your muscles won't get the blood it needs. Blood also contains oxygen and glucose which cells need to convert food to energy and to survive, so if the cells don't get blood they will die which will eventually kill the organism
8 0
3 years ago
Read 2 more answers
If a new organism were discovered which of the following would most likely be used to classify it into appropriate kingdom???
irina1246 [14]
Its dna or genetic sequence

4 0
3 years ago
_________ is a smooth muscle cell has a central nucleus but lacks striations.
Natalija [7]

Answer:

Linings of hollow organs

Explanation:

Smooth muscle cells are usually found in the lining of hollow organs such as all arteries and veins, wall of stomach, uterus, urinary bladder, digestive system etc. The cells of these linings are spindle shaped and consist of a nucleus at the center which lacks striations.  

They work as a housekeeper and are under involuntary control except the heart. They lack striation because of irregular arraying of actin and myosin filament along the length of the cell.  

4 0
3 years ago
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