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Kipish [7]
3 years ago
9

2. How many days is the average menstrual cycle for women?

Biology
1 answer:
fomenos3 years ago
5 0
The average length of a women's menstrual cycle can last 28 days.

the answer is D
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The electron transport chain is composed primarily of what biomolecule?
lys-0071 [83]

The correct answer is proteins.

The oxidative phosphorylation in the eukaryotes takes place within the mitochondria with the help of electron transport chain. The main objective of the electron transport chain is to accumulate enough amount of protons in the intermembrane space so that there will be a concentration gradient which would help in the production of ATP.  

The electron transport chain comprises of various molecules, but majorly the proteins, which are situated in the inner membrane of the mitochondria.  


3 0
3 years ago
Short definition of amoeba​
Dimas [21]
Amoeba: Also ameba. A single-celled (protozoan) organism that constantly changes shape. The word "ameba" is from the Greek "amoibe" meaning "change." Ameba can infect the bowels to cause diarrhea and the liver to cause abscess formation. Here is more information. The definition of an amoeba is a one-celled organism, common in water and soil, possessing no set cell organs, structure, or defining shape. An example of an amoeba is an invisible organism called Entamueba histolytica which is found in tropical areas that are unclean, and causes the deadly disease dysentery. Hope this helps! Mark brainly please!
4 0
3 years ago
List two biomes and their features. List the at least three features of each one of your biomes.
DaniilM [7]

Answer:

Tundra Biome and the Deciduous Forest Biome

Explanation:

for tundra the features are Extremely cold climate, Low biotic diversity ,Simple vegetation structure. and for deciduous forest  is Deciduous forests have a long, warm growing season as one of four distinct seasons, There is abundant moisture, Tree leaves are arranged in strata: canopy, understory, shrub, and ground.

7 0
3 years ago
The overall population of a species decreased. What could have occurred to make this happen?
andriy [413]
Starvation.
Disease.
Weather.
Lack of mate.
Offspring dying.
Hunting.<span />
4 0
4 years ago
Which of the following is a reason why sticky end producing restriction enzymes are preferred compared to blunt end ones?
anyanavicka [17]

Answer:

D) Because sticky ends can be temporarily held together by hydrogen bonding between the two strands.

Explanation:

Restriction enzymes cut the DNA at specific restriction sites and by the mechanism of action they can form two types of ends:

  • sticky ends-single-stranded overhangs are formed
  • blunt ends-without overhangs.

The main advantage of sticky ends (their overhangs) is that they can complementary bind to another overhand formed by the same restriction enzyme. So, for example in cloning, if the DNA of interest and plasmid vector are cut with the same restriction enzyme, that  forms sticky ends, fragment of DNA will fit into a bacterial plasmid in one direction.

On the other hand, blunt ends can be inserted into vector in both directions: head-to-tail or tail-to-head.

6 0
3 years ago
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