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Musya8 [376]
3 years ago
7

In ________ matter flows from one trophic level to another, and

Biology
1 answer:
Vika [28.1K]3 years ago
5 0
1 is the answer because it’s talking about chemical
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Pigments absorb light used in photosynthesis.Set of wavelengths that a pigment doesn't absorb are reflected.
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3 years ago
One form of chromatin modification is acetylation, which is known to occur on positively charged histone tail amino acids, thus
Naya [18.7K]

Answer:

A. The tails do not interact with the DNA

Explanation:

The acetylation refers to the transfer of the acetyl group from Acetyl-CoA to the N-terminal of the histone protein.

Lysine residues (positively charged amino acid) are present at the end of the N-terminal of the histone protein which is neutralized by the acetyl group.

This loses the compaction between the positively charged histone and the negatively charged DNA and the DNA becomes more relaxed. This relaxed state allows the transcription factors to easily bind the DNA and therefore the DNA becomes transcriptionally active.

Thus, Option-A is correct

4 0
3 years ago
CAN SOMEONE PLEASEEEE HELP ME WITH THIS SCIENCE QUESTION THANK YOU!! (Explain how you got the answer)
nadya68 [22]

Answer:

A. to conserve soil nutrients

Explanation:

Crop rotation helps to maintain soil structure and nutrient levels. If you don't rotate crops, the soil in that field will inevitably begin to lose the nutrients plants need to grow.

7 0
3 years ago
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A bacterial cell that contains an outer membrane and periplasmic space stains pink to red on Gram stain. Which one of the follow
anastassius [24]

Answer:

a. No discrepancy is present; organisms that contain an outer membrane and periplasmic space should stain pink because of their cell wall composition.

Explanation:

Gram stain is the staining method used to differentiate bacterial species into two groups, gram-positive and gram-negative bacteria. Factors that will differentiate gram-positive from gram-negative include the coloration of bacteria, the composition and chemical and physical properties of cell walls. In these tests, bacteria that have an outer membrane and a periplasmic space are considered gram negative and pink in color (sometimes similar to red) due to their cellular composition. For this reason we can state that there is no discrepancy present in the bacteria exposed in the question; Because this bacterium has an outer membrane and a periplasmic space, then it is normal for the bacteria to turn pink due to its cell wall composition.

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3 years ago
_______ contains the genetic instructions for making proteins.
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A gene contains the genetic instructions for making proteins. 
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